IOS常用代碼總結(jié)
1机断、設(shè)置UILabel行間距
NSMutableAttributedString* attrString = [[NSMutableAttributedString? alloc] initWithString:label.text];
??? NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
??? [style setLineSpacing:20];
??? [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, label.text.length)];
label.attributedText = attrString;
2楷拳、當(dāng)使用-performSelector:withObject:withObject:afterDelay:方法時，需要傳入多參數(shù)問題
// 方法一吏奸、
// 把參數(shù)放進(jìn)一個數(shù)組／字典欢揖，直接把數(shù)組／字典當(dāng)成一個參數(shù)傳過去，具體方法實現(xiàn)的地方再解析這個數(shù)組／字典
NSArray * array =
??? [NSArray arrayWithObjects: @"first", @"second", nil];
[self performSelector:@selector(fooFirstInput:) withObject: array afterDelay:15.0];
// 方法二奋蔚、
// 使用NSInvocation
SEL aSelector = NSSelectorFromString(@"doSoming:argument2:");
??? NSInteger argument1 = 10;
??? NSString *argument2 = @"argument2";
??? if([self respondsToSelector:aSelector]) {
??????? NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:aSelector]];
??????? [inv setSelector:aSelector];
??????? [inv setTarget:self];
??????? [inv setArgument:&(argument1) atIndex:2];
??????? [inv setArgument:&(argument2) atIndex:3];
??????? [inv performSelector:@selector(invoke) withObject:nil afterDelay:15.0];
}
3她混、UILabel顯示不同顏色字體
NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:label.text];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)];
label.attributedText = string;
4、比較兩個CGRect/CGSize/CGPoint是否相等
if (CGRectEqualToRect(rect1, rect2)) { // 兩個區(qū)域相等
??????? // do some
??? }
??? if (CGPointEqualToPoint(point1, point2)) { // 兩個點相等
??????? // do some
??? }
??? if (CGSizeEqualToSize(size1, size2)) { // 兩個size相等
??????? // do some
}
5泊碑、比較兩個NSDate相差多少小時
NSDate* date1 = someDate;
NSDate* date2 = someOtherDate;
NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];
double secondsInAnHour = 3600;
// 除以3600是把秒化成小時坤按，除以60得到結(jié)果為相差的分鐘數(shù)
NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;
6、每個cell之間增加間距
// 方法一馒过，每個分區(qū)只顯示一行cell臭脓，分區(qū)頭當(dāng)作你想要的間距(注意，從數(shù)據(jù)源數(shù)組中取值的時候需要用indexPath.section而不是indexPath.row)
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
??? return yourArry.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
??? return 1;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
??? return cellSpacingHeight;
}
// 方法二腹忽，在cell的contentView上加個稍微低一點的view来累，cell上原本的內(nèi)容放在你的view上砚作，而不是contentView上，這樣能偽造出一個間距來嘹锁。
// 方法三葫录，自定義cell，重寫setFrame：方法
- (void)setFrame:(CGRect)frame
{
??? frame.size.height -= 20;
??? [super setFrame:frame];
}
7领猾、播放一張張連續(xù)的圖片
// 加入現(xiàn)在有三張圖片分別為animate_1米同、animate_2蜕煌、animate_3
// 方法一
??? imageView.animationImages = @[[UIImage imageNamed:@"animate_1"], [UIImage imageNamed:@"animate_2"], [UIImage imageNamed:@"animate_3"]];
imageView.animationDuration = 1.0;
// 方法二
??? imageView.image = [UIImage animatedImageNamed:@"animate_" duration:1.0];
// 方法二解釋下癌椿，這個方法會加載animate_為前綴的，后邊0-1024，也就是animate_0拯坟、animate_1一直到animate_1024
8、加載gif圖片
推薦使用這個框架FLAnimatedImage
9韭山、防止離屏渲染為image添加圓角
// image分類
- (UIImage *)circleImage
{
// NO代表透明
UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);
// 獲得上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 添加一個圓
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
// 方形變圓形
CGContextAddEllipseInRect(ctx, rect);
// 裁剪
CGContextClip(ctx);
// 將圖片畫上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
10郁季、查看系統(tǒng)所有字體
// 打印字體
for (id familyName in [UIFont familyNames]) {
??? NSLog(@"%@", familyName);
??? for (id fontName in [UIFont fontNamesForFamilyName:familyName]) NSLog(@"? %@", fontName);
}
// 也可以進(jìn)入這個網(wǎng)址查看http://iosfonts.com/
11、獲取隨機數(shù)
NSInteger i = arc4random();
12钱磅、獲取隨機數(shù)小數(shù)(0-1之間)
#define ARC4RANDOM_MAX????? 0x100000000
double val = ((double)arc4random() / ARC4RANDOM_MAX);
13梦裂、AVPlayer視頻播放完成的通知監(jiān)聽
[[NSNotificationCenter defaultCenter]
????? addObserver:self
????? selector:@selector(videoPlayEnd)
????? name:AVPlayerItemDidPlayToEndTimeNotification
object:nil];
14、判斷兩個rect是否有交叉
if (CGRectIntersectsRect(rect1, rect2)) {
}
15盖淡、判斷一個字符串是否為數(shù)字
NSCharacterSet *notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
??? if ([str rangeOfCharacterFromSet:notDigits].location == NSNotFound)
??? {
????? // 是數(shù)字
??? } else
??? {
????? // 不是數(shù)字
}
16年柠、將一個view保存為pdf格式
- (void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
??? NSMutableData *pdfData = [NSMutableData data];
??? UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
??? UIGraphicsBeginPDFPage();
??? CGContextRef pdfContext = UIGraphicsGetCurrentContext();
??? [aView.layer renderInContext:pdfContext];
??? UIGraphicsEndPDFContext();
??? NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
??? NSString* documentDirectory = [documentDirectories objectAtIndex:0];
??? NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];
??? [pdfData writeToFile:documentDirectoryFilename atomically:YES];
??? NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
}
17、讓一個view在父視圖中心
child.center = [parent convertPoint:parent.center fromView:parent.superview];
18褪迟、獲取當(dāng)前導(dǎo)航控制器下前一個控制器
- (UIViewController *)backViewController
{
??? NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self];
??? if ( myIndex != 0 && myIndex != NSNotFound ) {
??????? return [self.navigationController.viewControllers objectAtIndex:myIndex-1];
??? } else {
??????? return nil;
??? }
}
19冗恨、保存UIImage到本地
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];
[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];
20、鍵盤上方增加工具欄
UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init];
[keyboardDoneButtonView sizeToFit];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"
?????????????????????????????????????????????????????????????? style:UIBarButtonItemStyleBordered target:self
????????????????????????????????????????????????????????????? action:@selector(doneClicked:)];
[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];
txtField.inputAccessoryView = keyboardDoneButtonView;
21味赃、copy一個view
因為UIView沒有實現(xiàn)copy協(xié)議掀抹，因此找不到copyWithZone方法，使用copy的時候?qū)е卤罎?/p>
但是我們可以通過歸檔再解檔實現(xiàn)copy心俗，這相當(dāng)于對視圖進(jìn)行了一次深拷貝傲武，代碼如下
id copyOfView =
[NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:originalView]];
22、在image上繪制文字并生成新的image
UIFont *font = [UIFont boldSystemFontOfSize:12];
??? UIGraphicsBeginImageContext(image.size);
??? [image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
??? CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);
??? [[UIColor whiteColor] set];
??? [text drawInRect:CGRectIntegral(rect) withFont:font];
??? UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
23城榛、判斷一個view是否為另一個view的子視圖
// 如果myView是self.view本身揪利，也會返回yes
BOOL isSubView = [myView isDescendantOfView:self.view];
24、判斷一個字符串是否包含另一個字符串
// 方法一狠持、這種方法只適用于iOS8之后土童，如果是配iOS8之前用方法二
if ([str containsString:otherStr]) NSLog(@"包含");
// 方法二
NSRange range = [str rangeOfString:otherStr];
if (range.location != NSNotFound) NSLog(@"包含");
25、UICollectionView自動滾動到某行
// 重寫viewDidLayoutSubviews方法
-(void)viewDidLayoutSubviews {
?? [super viewDidLayoutSubviews];
?? [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:NO];
}
26工坊、修改系統(tǒng)UIAlertController
// 但是據(jù)說這種方法會被App Store拒絕(慎用献汗！)
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
??? NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"我是一個大文本"];
??? [hogan addAttribute:NSFontAttributeName
????????????????? value:[UIFont systemFontOfSize:30]
????????????????? range:NSMakeRange(4, 1)];
??? [hogan addAttribute:NSForegroundColorAttributeName
????????????????? value:[UIColor redColor]
????????????????? range:NSMakeRange(4, 1)];
??? [alertVC setValue:hogan forKey:@"attributedTitle"];
??? UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){ }];
??? UIImage *accessoryImage = [UIImage imageNamed:@"1"];
??? [button setValue:accessoryImage forKey:@"image"];
??? [alertVC addAction:button];
[self presentViewController:alertVC animated:YES completion:nil];
27敢订、判斷某一行的cell是否已經(jīng)顯示
CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath];
BOOL completelyVisible = CGRectContainsRect(tableView.bounds, cellRect);
28、讓導(dǎo)航控制器pop回指定的控制器
NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
for (UIViewController *aViewController in allViewControllers) {
??? if ([aViewController isKindOfClass:[RequiredViewController class]]) {
??????? [self.navigationController popToViewController:aViewController animated:NO];
??? }
}
29罢吃、動畫修改label上的文字
// 方法一
CATransition *animation = [CATransition animation];
??? animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
??? animation.type = kCATransitionFade;
??? animation.duration = 0.75;
??? [self.label.layer addAnimation:animation forKey:@"kCATransitionFade"];
??? self.label.text = @"New";
// 方法二
[UIView transitionWithView:self.label
????????????????????? duration:0.25f
?????????????????????? options:UIViewAnimationOptionTransitionCrossDissolve
??????????????????? animations:^{
??????????????????????? self.label.text = @"Well done!";
??????????????????? } completion:nil];
// 方法三
[UIView animateWithDuration:1.0
???????????????????? animations:^{
???????????????????????? self.label.alpha = 0.0f;
???????????????????????? self.label.text = @"newText";
???????????????????????? self.label.alpha = 1.0f;
}];
30楚午、判斷字典中是否包含某個key值
if ([dic objectForKey:@"yourKey"]) {
??? NSLog(@"有這個值");
} else {
??? NSLog(@"沒有這個值");
}
31、獲取屏幕方向
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if(orientation == 0) //Default orientation
??? //默認(rèn)
else if(orientation == UIInterfaceOrientationPortrait)
??? //豎屏
else if(orientation == UIInterfaceOrientationLandscapeLeft)
??? // 左橫屏
else if(orientation == UIInterfaceOrientationLandscapeRight)
//右橫屏
32尿招、設(shè)置UIImage的透明度
// 方法一矾柜、添加UIImage分類
- (UIImage *)imageByApplyingAlpha:(CGFloat) alpha {
??? UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
??? CGContextRef ctx = UIGraphicsGetCurrentContext();
??? CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);
??? CGContextScaleCTM(ctx, 1, -1);
??? CGContextTranslateCTM(ctx, 0, -area.size.height);
??? CGContextSetBlendMode(ctx, kCGBlendModeMultiply);
??? CGContextSetAlpha(ctx, alpha);
??? CGContextDrawImage(ctx, area, self.CGImage);
??? UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
??? UIGraphicsEndImageContext();
??? return newImage;
}
// 方法二、如果沒有奇葩需求就谜，干脆用UIImageView設(shè)置透明度
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@"yourImage"]];
imageView.alpha = 0.5;
33怪蔑、Attempt to mutate immutable object with insertString:atIndex:
這個錯是因為你拿字符串調(diào)用insertString:atIndex:方法的時候，調(diào)用對象不是NSMutableString丧荐，應(yīng)該先轉(zhuǎn)成這個類型再調(diào)用
34缆瓣、UIWebView添加單擊手勢不響應(yīng)
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(webViewClick)];
??????? tap.delegate = self;
??????? [_webView addGestureRecognizer:tap];
// 因為webView本身有一個單擊手勢，所以再添加會造成手勢沖突虹统，從而不響應(yīng)弓坞。需要綁定手勢代理，并實現(xiàn)下邊的代理方法
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
??? return YES;
}
35车荔、獲取手機RAM容量
// 需要導(dǎo)入#import?
mach_port_t host_port;
??? mach_msg_type_number_t host_size;
??? vm_size_t pagesize;
??? host_port = mach_host_self();
??? host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
??? host_page_size(host_port, &pagesize);
??? vm_statistics_data_t vm_stat;
??? if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {
??????? NSLog(@"Failed to fetch vm statistics");
??? }
??? /* Stats in bytes */
??? natural_t mem_used = (vm_stat.active_count +
????????????????????????? vm_stat.inactive_count +
????????????????????????? vm_stat.wire_count) * pagesize;
??? natural_t mem_free = vm_stat.free_count * pagesize;
??? natural_t mem_total = mem_used + mem_free;
NSLog(@"已用: %u 可用: %u 總共: %u", mem_used, mem_free, mem_total);
36渡冻、地圖上兩個點之間的實際距離
// 需要導(dǎo)入#import?
CLLocation *locA = [[CLLocation alloc] initWithLatitude:34 longitude:113];
??? CLLocation *locB = [[CLLocation alloc] initWithLatitude:31.05 longitude:121.76];
// CLLocationDistance求出的單位為米
CLLocationDistance distance = [locA distanceFromLocation:locB];
37、在應(yīng)用中打開設(shè)置的某個界面
// 打開設(shè)置->通用
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]];
// 以下是設(shè)置其他界面
prefs:root=General&path=About
prefs:root=General&path=ACCESSIBILITY
prefs:root=AIRPLANE_MODE
prefs:root=General&path=AUTOLOCK
prefs:root=General&path=USAGE/CELLULAR_USAGE
prefs:root=Brightness
prefs:root=Bluetooth
prefs:root=General&path=DATE_AND_TIME
prefs:root=FACETIME
prefs:root=General
prefs:root=General&path=Keyboard
prefs:root=CASTLE
prefs:root=CASTLE&path=STORAGE_AND_BACKUP
prefs:root=General&path=INTERNATIONAL
prefs:root=LOCATION_SERVICES
prefs:root=ACCOUNT_SETTINGS
prefs:root=MUSIC
prefs:root=MUSIC&path=EQ
prefs:root=MUSIC&path=VolumeLimit
prefs:root=General&path=Network
prefs:root=NIKE_PLUS_IPOD
prefs:root=NOTES
prefs:root=NOTIFICATIONS_ID
prefs:root=Phone
prefs:root=Photos
prefs:root=General&path=ManagedConfigurationList
prefs:root=General&path=Reset
prefs:root=Sounds&path=Ringtone
prefs:root=Safari
prefs:root=General&path=Assistant
prefs:root=Sounds
prefs:root=General&path=SOFTWARE_UPDATE_LINK
prefs:root=STORE
prefs:root=TWITTER
prefs:root=FACEBOOK
prefs:root=General&path=USAGE prefs:root=VIDEO
prefs:root=General&path=Network/VPN
prefs:root=Wallpaper
prefs:root=WIFI
prefs:root=INTERNET_TETHERING
prefs:root=Phone&path=Blocked
prefs:root=DO_NOT_DISTURB
38忧便、在UITextView中顯示html文本
??? UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 30, 100, 199)];
??? textView.backgroundColor = [UIColor redColor];
??? [self.view addSubview:textView];
NSString *htmlString = @"
Header
Subheader
Some?text
";
??? NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes: nil error: nil];
textView.attributedText = attributedString;
39族吻、監(jiān)聽scrollView是否滾動到了頂部／底部
-(void)scrollViewDidScroll: (UIScrollView*)scrollView
{
??? float scrollViewHeight = scrollView.frame.size.height;
??? float scrollContentSizeHeight = scrollView.contentSize.height;
??? float scrollOffset = scrollView.contentOffset.y;
??? if (scrollOffset == 0)
??? {
??????? // 滾動到了頂部
??? }
??? else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight)
??? {
??????? // 滾動到了底部
??? }
}
40、UISlider增量／減量為固定值(假如為5)
- (void)setupSlider
{
??? UISlider *slider = [[UISlider alloc] init];
??? [self.view addSubview:slider];
??? [slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
??? slider.maximumValue = 100;
??? slider.minimumValue = 0;
??? slider.frame = CGRectMake(200, 20, 100, 30);
}
- (void)sliderAction:(UISlider *)slider
{
??? [slider setValue:((int)((slider.value + 2.5) / 5) * 5) animated:NO];
}
41珠增、選中textField或者textView所有文本(我這里以textView為例)
[self.textView setSelectedTextRange:[self.textView textRangeFromPosition:self.textView.beginningOfDocument toPosition:self.textView.endOfDocument]]
42超歌、從導(dǎo)航控制器中刪除某個控制器
// 方法一、知道這個控制器所處的導(dǎo)航控制器下標(biāo)
NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];
[navigationArray removeObjectAtIndex: 2];
self.navigationController.viewControllers = navigationArray;
// 方法二切平、知道具體是哪個控制器
NSArray* tempVCA = [self.navigationController viewControllers];
for(UIViewController *tempVC in tempVCA)
{
??? if([tempVC isKindOfClass:[urViewControllerClass class]])
??? {
??????? [tempVC removeFromParentViewController];
??? }
}
43握础、隱藏UITextView/UITextField光標(biāo)
textField.tintColor = [UIColor clearColor];
44、當(dāng)UITextView/UITextField中沒有文字時悴品，禁用回車鍵
textField.enablesReturnKeyAutomatically = YES;
45禀综、字符串encode編碼(編碼url字符串不成功的問題)
// 我們一般用這個方法處理stringByAddingPercentEscapesUsingEncoding但是這個方法好想不會處理／和&這種特殊符號，這種情況就需要用下邊這個方法處理
@implementation NSString (NSString_Extended)
- (NSString *)urlencode {
??? NSMutableString *output = [NSMutableString string];
??? const unsigned char *source = (const unsigned char *)[self UTF8String];
??? int sourceLen = strlen((const char *)source);
??? for (int i = 0; i < sourceLen; ++i) {
??????? const unsigned char thisChar = source[i];
??????? if (thisChar == ' '){
??????????? [output appendString:@"+"];
??????? } else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' ||
?????????????????? (thisChar >= 'a' && thisChar <= 'z') ||
?????????????????? (thisChar >= 'A' && thisChar <= 'Z') ||
?????????????????? (thisChar >= '0' && thisChar <= '9')) {
??????????? [output appendFormat:@"%c", thisChar];
??????? } else {
??????????? [output appendFormat:@"%%%02X", thisChar];
??????? }
??? }
??? return output;
}
46苔严、計算UILabel上某段文字的frame
@implementation UILabel (TextRect)
- (CGRect)boundingRectForCharacterRange:(NSRange)range
{
??? NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:[self attributedText]];
??? NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
??? [textStorage addLayoutManager:layoutManager];
??? NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:[self bounds].size];
??? textContainer.lineFragmentPadding = 0;
??? [layoutManager addTextContainer:textContainer];
??? NSRange glyphRange;
??? [layoutManager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];
??? return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer];
}
47定枷、獲取隨機UUID
NSString *result;
??? if([[[UIDevice currentDevice] systemVersion] floatValue] > 6.0)
??? {
?????? result = [[NSUUID UUID] UUIDString];
??? }
??? else
??? {
??????? CFUUIDRef uuidRef = CFUUIDCreate(NULL);
??????? CFStringRef uuid = CFUUIDCreateString(NULL, uuidRef);
??????? CFRelease(uuidRef);
??????? result = (__bridge_transfer NSString *)uuid;
}
48、仿蘋果抖動動畫
#define RADIANS(degrees) (((degrees) * M_PI) / 180.0)
- (void)startAnimate {
??? view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-5));
??? [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse) animations:^ {
???????????????????????? view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(5));
???????????????????? } completion:nil];
}
- (void)stopAnimate {
??? [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveLinear) animations:^ {
???????????????????????? view.transform = CGAffineTransformIdentity;
???????????????????? } completion:nil];
}
49届氢、修改UISearBar內(nèi)部背景顏色
UITextField *textField = [_searchBar valueForKey:@"_searchField"];
textField.backgroundColor = [UIColor redColor];
50欠窒、UITextView滾動到頂部
??? // 方法一
??? [self.textView scrollRangeToVisible:NSMakeRange(0, 0)];
??? // 方法二
[self.textView setContentOffset:CGPointZero animated:YES];
51、通知監(jiān)聽APP生命周期
UIApplicationDidEnterBackgroundNotification 應(yīng)用程序進(jìn)入后臺
UIApplicationWillEnterForegroundNotification 應(yīng)用程序?qū)⒁M(jìn)入前臺
UIApplicationDidFinishLaunchingNotification 應(yīng)用程序完成啟動
UIApplicationDidFinishLaunchingNotification 應(yīng)用程序由掛起變的活躍
UIApplicationWillResignActiveNotification 應(yīng)用程序掛起(有電話進(jìn)來或者鎖屏)
UIApplicationDidReceiveMemoryWarningNotification 應(yīng)用程序收到內(nèi)存警告
UIApplicationDidReceiveMemoryWarningNotification 應(yīng)用程序終止(后臺殺死、手機關(guān)機等)
UIApplicationSignificantTimeChangeNotification 當(dāng)有重大時間改變(凌晨0點岖妄，設(shè)備時間被修改型将，時區(qū)改變等)
UIApplicationWillChangeStatusBarOrientationNotification 設(shè)備方向?qū)⒁淖?/p>
UIApplicationDidChangeStatusBarOrientationNotification 設(shè)備方向改變
UIApplicationWillChangeStatusBarFrameNotification 設(shè)備狀態(tài)欄frame將要改變
UIApplicationDidChangeStatusBarFrameNotification 設(shè)備狀態(tài)欄frame改變
UIApplicationBackgroundRefreshStatusDidChangeNotification 應(yīng)用程序在后臺下載內(nèi)容的狀態(tài)發(fā)生變化
UIApplicationProtectedDataWillBecomeUnavailable 本地受保護(hù)的文件被鎖定,無法訪問
UIApplicationProtectedDataWillBecomeUnavailable 本地受保護(hù)的文件可用了
52、觸摸事件類型
UIControlEventTouchCancel 取消控件當(dāng)前觸發(fā)的事件
UIControlEventTouchDown 點按下去的事件
UIControlEventTouchDownRepeat 重復(fù)的觸動事件
UIControlEventTouchDragEnter 手指被拖動到控件的邊界的事件
UIControlEventTouchDragExit 一個手指從控件內(nèi)拖到外界的事件
UIControlEventTouchDragInside 手指在控件的邊界內(nèi)拖動的事件
UIControlEventTouchDragOutside 手指在控件邊界之外被拖動的事件
UIControlEventTouchUpInside 手指處于控制范圍內(nèi)的觸摸事件
UIControlEventTouchUpOutside 手指超出控制范圍的控制中的觸摸事件
53荐虐、UITextField文字周圍增加邊距
??? // 子類化UITextField七兜，增加insert屬性
@interface WZBTextField : UITextField
@property (nonatomic, assign) UIEdgeInsets insets;
@end
// 在.m文件重寫下列方法
- (CGRect)textRectForBounds:(CGRect)bounds {
??? CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);
??? if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {
??????? return [self adjustRectWithWidthRightView:paddedRect];
??? }
??? return paddedRect;
}
- (CGRect)placeholderRectForBounds:(CGRect)bounds {
??? CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);
??? if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {
??????? return [self adjustRectWithWidthRightView:paddedRect];
??? }
??? return paddedRect;
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
??? CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);
??? if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeWhileEditing) {
??????? return [self adjustRectWithWidthRightView:paddedRect];
??? }
??? return paddedRect;
}
- (CGRect)adjustRectWithWidthRightView:(CGRect)bounds {
??? CGRect paddedRect = bounds;
??? paddedRect.size.width -= CGRectGetWidth(self.rightView.frame);
??? return paddedRect;
}
54、監(jiān)聽UISlider拖動狀態(tài)
// 添加事件
[slider addTarget:self action:@selector(sliderValurChanged:forEvent:) forControlEvents:UIControlEventValueChanged];
// 實現(xiàn)方法
- (void)sliderValurChanged:(UISlider*)slider forEvent:(UIEvent*)event {
??? UITouch *touchEvent = [[event allTouches] anyObject];
??? switch (touchEvent.phase) {
??????? case UITouchPhaseBegan:
??????????? NSLog(@"開始拖動");
??????????? break;
??????? case UITouchPhaseMoved:
??????????? NSLog(@"正在拖動");
??????????? break;
??????? case UITouchPhaseEnded:
??????????? NSLog(@"結(jié)束拖動");
??????????? break;
??????? default:
??????????? break;
??? }
}
55福扬、設(shè)置UITextField光標(biāo)位置
// textField需要設(shè)置的textField腕铸，index要設(shè)置的光標(biāo)位置
- (void)cursorLocation:(UITextField *)textField index:(NSInteger)index
{
??? NSRange range = NSMakeRange(index, 0);
??? UITextPosition *start = [textField positionFromPosition:[textField beginningOfDocument] offset:range.location];
??? UITextPosition *end = [textField positionFromPosition:start offset:range.length];
??? [textField setSelectedTextRange:[textField textRangeFromPosition:start toPosition:end]];
}
56、去除webView底部黑色
??? [webView setBackgroundColor:[UIColor clearColor]];
??? [webView setOpaque:NO];
??? for (UIView *v1 in [webView subviews])
??? {
??????? if ([v1 isKindOfClass:[UIScrollView class]])
??????? {
??????????? for (UIView *v2 in v1.subviews)
??????????? {
??????????????? if ([v2 isKindOfClass:[UIImageView class]])
??????????????? {
??????????????????? v2.hidden = YES;
??????????????? }
??????????? }
??????? }
}
57铛碑、獲取collectionViewCell在屏幕中的frame
UICollectionViewLayoutAttributes *attributes = [collectionView layoutAttributesForItemAtIndexPath:indexPath];
CGRect cellRect = attributes.frame;
CGRect cellFrameInSuperview = [collectionView convertRect:cellRect toView:[cv superview]];
58狠裹、比較兩個UIImage是否相等
- (BOOL)image:(UIImage *)image1 isEqualTo:(UIImage *)image2
{
??? NSData *data1 = UIImagePNGRepresentation(image1);
??? NSData *data2 = UIImagePNGRepresentation(image2);
??? return [data1 isEqual:data2];
}
59、解決當(dāng)UIScrollView上有UIButton的時候汽烦，觸摸到button滑動不了的問題
// 子類化UIScrollView涛菠，并重寫以下方法
- (instancetype)initWithFrame:(CGRect)frame {
??? if (self = [super initWithFrame:frame]) {
??????? self.delaysContentTouches = NO;
??? }
??? return self;
}
- (BOOL)touchesShouldCancelInContentView:(UIView *)view {
??? if ([view isKindOfClass:UIButton.class]) {
??????? return YES;
??? }
??? return [super touchesShouldCancelInContentView:view];
}
60、UITextView中的文字添加陰影效果
- (void)setTextLayer:(UITextView *)textView color:(UIColor *)color
{
??? CALayer *textLayer = ((CALayer *)[textView.layer.sublayers objectAtIndex:0]);
??? textLayer.shadowColor = color.CGColor;
??? textLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);
??? textLayer.shadowOpacity = 1.0f;
??? textLayer.shadowRadius = 1.0f;
}
61刹缝、MD5加密
+ (NSString *)md5:(NSString *)str
{
??? const char *concat_str = [str UTF8String];
??? unsigned char result[CC_MD5_DIGEST_LENGTH];
??? CC_MD5(concat_str, (unsigned int)strlen(concat_str), result);
??? NSMutableString *hash = [NSMutableString string];
??? for (int i =0; i <16; i++){
??????? [hash appendFormat:@"%02X", result[i]];
??? }
??? return [hash uppercaseString];
}
62碗暗、base64加密
@interface NSData (Base64)
/**
*? @brief? 字符串base64后轉(zhuǎn)data
*/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string
{
??? if (![string length]) return nil;
??? NSData *decoded = nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
??? if (![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)])
??? {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
??????? decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];
#pragma clang diagnostic pop
??? }
??? else
#endif
??? {
??????? decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
??? }
??? return [decoded length]? decoded: nil;
}
/**
*? @brief? NSData轉(zhuǎn)string
*? @param wrapWidth 換行長度? 76? 64
*/
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
{
??? if (![self length]) return nil;
??? NSString *encoded = nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
??? if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])
??? {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
??????? encoded = [self base64Encoding];
#pragma clang diagnostic pop
??? }
??? else
#endif
??? {
??????? switch (wrapWidth)
??????? {
??????????? case 64:
??????????? {
??????????????? return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
??????????? }
??????????? case 76:
??????????? {
??????????????? return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];
??????????? }
??????????? default:
??????????? {
??????????????? encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];
??????????? }
??????? }
??? }
??? if (!wrapWidth || wrapWidth >= [encoded length])
??? {
??????? return encoded;
??? }
??? wrapWidth = (wrapWidth / 4) * 4;
??? NSMutableString *result = [NSMutableString string];
??? for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth)
??? {
??????? if (i + wrapWidth >= [encoded length])
??????? {
??????????? [result appendString:[encoded substringFromIndex:i]];
??????????? break;
??????? }
??????? [result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];
??????? [result appendString:@"\r\n"];
??? }
??? return result;
}
/**
*? @brief? NSData轉(zhuǎn)string 換行長度默認(rèn)64
*/
- (NSString *)base64EncodedString
{
??? return [self base64EncodedStringWithWrapWidth:0];
}
63颈将、AES加密
#import?
@interface NSData (AES)
/**
*? 利用AES加密數(shù)據(jù)
*/
- (NSData*)encryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {
??? NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
??? size_t dataMoved;
??? NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];
??? CCCryptorStatus status = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes, encryptedData.length,&dataMoved);
??? if (status == kCCSuccess) {
??????? encryptedData.length = dataMoved;
??????? return encryptedData;
??? }
??? return nil;
}
/**
*? @brief? 利用AES解密據(jù)
*/
- (NSData*)decryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {
??? NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
??? size_t dataMoved;
??? NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];
??? CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes, decryptedData.length,&dataMoved);
??? if (result == kCCSuccess) {
??????? decryptedData.length = dataMoved;
??????? return decryptedData;
??? }
??? return nil;
}
64梢夯、3DES加密
#import?
@interface NSData (3DES)
/**
*? 利用3DES加密數(shù)據(jù)
*/
- (NSData*)encryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {
??? NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
??? size_t dataMoved;
??? NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];
??? CCCryptorStatus result = CCCrypt(kCCEncrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes,encryptedData.length,&dataMoved);
??? if (result == kCCSuccess) {
??????? encryptedData.length = dataMoved;
??????? return encryptedData;
??? }
??? return nil;
}
/**
*? @brief?? 利用3DES解密數(shù)據(jù)
*/
- (NSData*)decryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {
??? NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
??? size_t dataMoved;
??? NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];
??? CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes,decryptedData.length,&dataMoved);
??? if (result == kCCSuccess) {
??????? decryptedData.length = dataMoved;
??????? return decryptedData;
??? }
??? return nil;
}
65、單個頁面多個網(wǎng)絡(luò)請求的情況晴圾，需要監(jiān)聽所有網(wǎng)絡(luò)請求結(jié)束后刷新UI
dispatch_group_t group = dispatch_group_create();
??? dispatch_queue_t serialQueue = dispatch_queue_create("com.wzb.test.www", DISPATCH_QUEUE_SERIAL);
??? dispatch_group_enter(group);
??? dispatch_group_async(group, serialQueue, ^{
??????? // 網(wǎng)絡(luò)請求一
??????? [WebClick getDataSuccess:^(ResponseModel *model) {
??????????? dispatch_group_leave(group);
??????? } failure:^(NSString *err) {
??????????? dispatch_group_leave(group);
??????? }];
??? });
??? dispatch_group_enter(group);
??? dispatch_group_async(group, serialQueue, ^{
??????? // 網(wǎng)絡(luò)請求二
??????? [WebClick getDataSuccess:getBigTypeRM onSuccess:^(ResponseModel *model) {
??????????? dispatch_group_leave(group);
??????? }????????????????????????????????? failure:^(NSString *errorString) {
??????????? dispatch_group_leave(group);
??????? }];
??? });
??? dispatch_group_enter(group);
??? dispatch_group_async(group, serialQueue, ^{
??????? // 網(wǎng)絡(luò)請求三
??????? [WebClick getDataSuccess:^{
??????????? dispatch_group_leave(group);
??????? } failure:^(NSString *errorString) {
??????????? dispatch_group_leave(group);
??????? }];
??? });
??? // 所有網(wǎng)絡(luò)請求結(jié)束后會來到這個方法
??? dispatch_group_notify(group, serialQueue, ^{
??????? dispatch_async(dispatch_get_global_queue(0, 0), ^{
??????????? dispatch_async(dispatch_get_main_queue(), ^{
??????????????? // 刷新UI
??????????? });
??????? });
});
66颂砸、解決openUrl延時問題
// 方法一
dispatch_async(dispatch_get_main_queue(), ^{
??? UIApplication *application = [UIApplication sharedApplication];
??? if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
??????? [application openURL:URL options:@{}
?????????? completionHandler:nil];
??? } else {
??????? [application openURL:URL];
??? }
??? });
// 方法二
[self performSelector:@selector(redirectToURL:) withObject:url afterDelay:0.1];
- (void) redirectToURL
{
UIApplication *application = [UIApplication sharedApplication];
??? if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
??????? [application openURL:URL options:@{}
?????????? completionHandler:nil];
??? } else {
??????? [application openURL:URL];
??? }
}
67、頁面跳轉(zhuǎn)實現(xiàn)翻轉(zhuǎn)動畫
// modal方式
??? TestViewController *vc = [[TestViewController alloc] init];
??? vc.view.backgroundColor = [UIColor redColor];
??? vc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
??? [self presentViewController:vc animated:YES completion:nil];
// push方式
??? TestViewController *vc = [[TestViewController alloc] init];
??? vc.view.backgroundColor = [UIColor redColor];
??? [UIView beginAnimations:@"View Flip" context:nil];
??? [UIView setAnimationDuration:0.80];
??? [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
??? [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];
??? [self.navigationController pushViewController:vc animated:YES];
[UIView commitAnimations];
68死姚、tableView實現(xiàn)無限滾動
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
??? CGFloat actualPosition = scrollView.contentOffset.y;
??? CGFloat contentHeight = scrollView.contentSize.height - scrollView.frame.size.height;
??? if (actualPosition >= contentHeight) {
??????? [self.dataArr addObjectsFromArray:self.dataArr];
??????? [self.tableView reloadData];
??? }
}
69人乓、代碼方式調(diào)整屏幕亮度
// brightness屬性值在0-1之間，0代表最小亮度都毒，1代表最大亮度
[[UIScreen mainScreen] setBrightness:0.5];
70色罚、獲取當(dāng)前應(yīng)用CUP用量
float cpu_usage()
{
??? kern_return_t kr;
??? task_info_data_t tinfo;
??? mach_msg_type_number_t task_info_count;
??? task_info_count = TASK_INFO_MAX;
??? kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);
??? if (kr != KERN_SUCCESS) {
??????? return -1;
??? }
??? task_basic_info_t????? basic_info;
??? thread_array_t???????? thread_list;
??? mach_msg_type_number_t thread_count;
??? thread_info_data_t???? thinfo;
??? mach_msg_type_number_t thread_info_count;
??? thread_basic_info_t basic_info_th;
??? uint32_t stat_thread = 0; // Mach threads
??? basic_info = (task_basic_info_t)tinfo;
??? // get threads in the task
??? kr = task_threads(mach_task_self(), &thread_list, &thread_count);
??? if (kr != KERN_SUCCESS) {
??????? return -1;
??? }
??? if (thread_count > 0)
??????? stat_thread += thread_count;
??? long tot_sec = 0;
??? long tot_usec = 0;
??? float tot_cpu = 0;
??? int j;
??? for (j = 0; j < (int)thread_count; j++)
??? {
??????? thread_info_count = THREAD_INFO_MAX;
??????? kr = thread_info(thread_list[j], THREAD_BASIC_INFO,
???????????????????????? (thread_info_t)thinfo, &thread_info_count);
??????? if (kr != KERN_SUCCESS) {
??????????? return -1;
??????? }
??????? basic_info_th = (thread_basic_info_t)thinfo;
??????? if (!(basic_info_th->flags & TH_FLAGS_IDLE)) {
??????????? tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds;
??????????? tot_usec = tot_usec + basic_info_th->user_time.microseconds + basic_info_th->system_time.microseconds;
??????????? tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0;
??????? }
??? } // for each thread
??? kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));
??? assert(kr == KERN_SUCCESS);
??? return tot_cpu;
}
71、float數(shù)據(jù)取整四舍五入
??? CGFloat f = 4.65;
??? NSLog(@"%d", (int)f);??? // 打印結(jié)果4
??? CGFloat f = 4.65;
NSLog(@"%d", (int)round(f));??? // 打印結(jié)果5
72账劲、刪除UISearchBar系統(tǒng)默認(rèn)邊框
??? // 方法一
??? searchBar.searchBarStyle = UISearchBarStyleMinimal;
??? // 方法二
??? [searchBar setBackgroundImage:[[UIImage alloc]init]];
??? // 方法三
searchBar.barTintColor = [UIColor whiteColor];
73戳护、為UICollectionViewCell設(shè)置圓角和陰影
cell.contentView.layer.cornerRadius = 2.0f;
cell.contentView.layer.borderWidth = 1.0f;
cell.contentView.layer.borderColor = [UIColor clearColor].CGColor;
cell.contentView.layer.masksToBounds = YES;
cell.layer.shadowColor = [UIColor lightGrayColor].CGColor;
cell.layer.shadowOffset = CGSizeMake(0, 2.0f);
cell.layer.shadowRadius = 2.0f;
cell.layer.shadowOpacity = 1.0f;
cell.layer.masksToBounds = NO;
cell.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:cell.contentView.layer.cornerRadius].CGPath;
74、讓正在滑動的scrollView停止?jié)L動(不是禁止瀑焦，而是暫時停止?jié)L動)
[scrollView setContentOffset:scrollView.contentOffset animated:NO];
76腌且、根據(jù)經(jīng)緯度獲取城市等信息
// 創(chuàng)建經(jīng)緯度
??? CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
??? //創(chuàng)建一個譯碼器
??? CLGeocoder *cLGeocoder = [[CLGeocoder alloc] init];
??? [cLGeocoder reverseGeocodeLocation:userLocation completionHandler:^(NSArray *placemarks, NSError *error) {
??????? CLPlacemark *place = [placemarks objectAtIndex:0];
??????? // 位置名
NSLog(@"name,%@",place.name);
??? // 街道
??? NSLog(@"thoroughfare,%@",place.thoroughfare);
??? // 子街道
??? NSLog(@"subThoroughfare,%@",place.subThoroughfare);
??? // 市
??? NSLog(@"locality,%@",place.locality);
??? // 區(qū)
??? NSLog(@"subLocality,%@",place.subLocality);
??? // 國家
??? NSLog(@"country,%@",place.country);
??????? }
??? }];
/*? CLPlacemark中屬性含義
name??????????????????? 地名
thoroughfare??????????? 街道
subThoroughfare??????? 街道相關(guān)信息，例如門牌等
locality??????????????? 城市
subLocality??????????? 城市相關(guān)信息榛瓮，例如標(biāo)志性建筑
administrativeArea????? 直轄市
subAdministrativeArea? 其他行政區(qū)域信息（自治區(qū)等）
postalCode????????????? 郵編
ISOcountryCode????????? 國家編碼
country??????????????? 國家
inlandWater??????????? 水源铺董，湖泊
ocean????????????????? 海洋
areasOfInterest??????? 關(guān)聯(lián)的或利益相關(guān)的地標(biāo)
*/
77、如何防止添加多個NSNotification觀察者禀晓？
// 解決方案就是添加觀察者之前先移除下這個觀察者
[[NSNotificationCenter defaultCenter] removeObserver:observer name:name object:object];
[[NSNotificationCenter defaultCenter] addObserver:observer selector:selector name:name object:object];
78精续、將一個xib添加到另外一個xib上
// 假設(shè)你的自定義view名字為CustomView坝锰，你需要在CustomView.m中重寫 `- (instancetype)initWithCoder:(NSCoder *)aDecoder` 方法，代碼如下：
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
??? if ((self = [super initWithCoder:aDecoder])) {
??????? [self addSubview:[[[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:self options:nil] objectAtIndex:0]];
??? }
??? return self;
}
need-to-insert-img
將一個xib添加到另外一個xib上.png
79重付、處理字符串什黑，使其首字母大寫
??? NSString *str = @"abcdefghijklmn";
??? NSString *resultStr;
??? if (str && str.length > 0) {
??????? resultStr = [str stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[str substringToIndex:1] capitalizedString]];
??? }
NSLog(@"%@", resultStr);
80、判斷一個UIAlertView/UIAlertController是否顯示
// UIAlertView自帶屬性
if (alert.visible)
{
????? NSLog(@"顯示了");
} else {
????? NSLog(@"未顯示");
}
// UIAlertController沒有visible屬性堪夭，需要自己判斷愕把，添加一個全局變量 BOOL visible
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleAlert];
??? UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"ActionTitle" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
??????? self.visible = NO;
??? }];
??? UIAlertAction *calcelAction = [UIAlertAction actionWithTitle:@"calcelTitle" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
??????? self.visible = NO;
??? }];
??? [alertController addAction:alertAction];
??? [alertController addAction:calcelAction];
??? [self presentViewController:alertController animated:YES completion:^{
??????? self.visible = YES;
}];
81、獲取字符串中的數(shù)字
- (NSString *)getNumberFromStr:(NSString *)str
{
??? NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
??? return [[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];
}
NSLog(@"%@", [self getNumberFromStr:@"a0b0c1d2e3f4fda8fa8fad9fsad23"]); // 00123488923
82森爽、為UIView的某個方向添加邊框
// 添加UIView分類
// UIView+WZB.h
#import?
/**
邊框方向
- WZBBorderDirectionTop: 頂部
- WZBBorderDirectionLeft: 左邊
- WZBBorderDirectionBottom: 底部
- WZBBorderDirectionRight: 右邊
*/
typedef NS_ENUM(NSInteger, WZBBorderDirectionType) {
??? WZBBorderDirectionTop = 0,
??? WZBBorderDirectionLeft,
??? WZBBorderDirectionBottom,
??? WZBBorderDirectionRight
};
@interface UIView (WZB)
/**
為UIView的某個方向添加邊框
@param direction 邊框方向
@param color 邊框顏色
@param width 邊框?qū)挾?/p>
*/
- (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color width:(CGFloat)width;
@end
// UIView+WZB.m
#import "UIView+WZB.h"
@implementation UIView (WZB)
- (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color width:(CGFloat)width
{
??? CALayer *border = [CALayer layer];
??? border.backgroundColor = color.CGColor;
??? switch (direction) {
??????? case WZBBorderDirectionTop:
??????? {
??????????? border.frame = CGRectMake(0.0f, 0.0f, self.bounds.size.width, width);
??????? }
??????????? break;
??????? case WZBBorderDirectionLeft:
??????? {
??????????? border.frame = CGRectMake(0.0f, 0.0f, width, self.bounds.size.height);
??????? }
??????????? break;
??????? case WZBBorderDirectionBottom:
??????? {
??????????? border.frame = CGRectMake(0.0f, self.bounds.size.height - width, self.bounds.size.width, width);
??????? }
??????????? break;
??????? case WZBBorderDirectionRight:
??????? {
??????????? border.frame = CGRectMake(self.bounds.size.width - width, 0, width, self.bounds.size.height);
??????? }
??????????? break;
??????? default:
??????????? break;
??? }
??? [self.layer addSublayer:border];
}
83恨豁、通過屬性設(shè)置UISwitch、UIProgressView等控件的寬高
mySwitch.transform = CGAffineTransformMakeScale(5.0f, 5.0f);
progressView.transform = CGAffineTransformMakeScale(5.0f, 5.0f);
84爬迟、自動搜索功能橘蜜，用戶連續(xù)輸入的時候不搜索，用戶停止輸入的時候自動搜索(我這里設(shè)置的是0.5s付呕，可根據(jù)需求更改)
// 輸入框文字改變的時候調(diào)用
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
??? // 先取消調(diào)用搜索方法
??? [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(searchNewResult) object:nil];
??? // 0.5秒后調(diào)用搜索方法
??? [self performSelector:@selector(searchNewResult) withObject:nil afterDelay:0.5];
}
85计福、修改UISearchBar的占位文字顏色
??? // 方法一（推薦使用）
??? UITextField *searchField = [searchBar valueForKey:@"_searchField"];
??? [searchField setValue:[UIColor blueColor] forKeyPath:@"_placeholderLabel.textColor"];
??? // 方法二（已過期）
??? [[UILabel appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:[UIColor redColor]];
??? // 方法三（已過期）
??? NSDictionary *placeholderAttributes = @{NSForegroundColorAttributeName : [UIColor redColor], NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:15],};
??? NSAttributedString *attributedPlaceholder = [[NSAttributedString alloc] initWithString:searchBar.placeholder attributes:placeholderAttributes];
[[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setAttributedPlaceholder:attributedPlaceholder];
86、某個界面多個事件同時響應(yīng)引起的問題(比如徽职，兩個button同時按push到新界面象颖，兩個都會響應(yīng)，可能導(dǎo)致push重疊)
// UIView有個屬性叫做exclusiveTouch姆钉，設(shè)置為YES后说订，其響應(yīng)事件會和其他view互斥(有其他view事件響應(yīng)的時候點擊它不起作用)
view.exclusiveTouch = YES;
// 一個一個設(shè)置太麻煩了，可以全局設(shè)置
[[UIView appearance] setExclusiveTouch:YES];
// 或者只設(shè)置button
[[UIButton appearance] setExclusiveTouch:YES];
87潮瓶、修改tabBar的frame
// 子類化UITabBarViewController陶冷，我這里以修改tabBar高度為例，重寫viewWillLayoutSubviews方法
#import "WZBTabBarViewController.h"
@interface WZBTabBarViewController ()
@end
@implementation WZBTabBarViewController
- (void)viewWillLayoutSubviews {
??? CGRect tabFrame = self.tabBar.frame;
??? tabFrame.size.height = 100;
??? tabFrame.origin.y = self.view.frame.size.height - 100;
??? self.tabBar.frame = tabFrame;
}
@end
88毯辅、修改鍵盤背景顏色
// 設(shè)置某個鍵盤顏色
??? textField.keyboardAppearance = UIKeyboardAppearanceAlert;
// 設(shè)置工程中所有鍵盤顏色
[[UITextField appearance] setKeyboardAppearance:UIKeyboardAppearanceAlert];
89埂伦、修改image顏色
UIImage *image = [UIImage imageNamed:@"test"];
??? imageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
??? CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
??? UIGraphicsBeginImageContext(rect.size);
??? CGContextRef context = UIGraphicsGetCurrentContext();
??? CGContextClipToMask(context, rect, image.CGImage);
??? CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);
??? CGContextFillRect(context, rect);
??? UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
??? UIGraphicsEndImageContext();
??? UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation: UIImageOrientationDownMirrored];
imageView.image = flippedImage;
90、動畫執(zhí)行removeFromSuperview
??? [UIView animateWithDuration:0.2
???????????????????? animations:^{
???????????????????????? view.alpha = 0.0f;
???????????????????? } completion:^(BOOL finished){
???????????????????????? [view removeFromSuperview];
}];
91思恐、啟動頁顯示延時
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//? 延時10s
??? sleep(10);
??? return YES;
}
92沾谜、設(shè)置UIButton高亮?xí)r的背景顏色
// 方法一、子類化UIButton壁袄，重寫setHighlighted:方法类早，代碼如下
#import "WZBButton.h"
@implementation WZBButton
- (void)setHighlighted:(BOOL)highlighted {
??? [super setHighlighted:highlighted];
??? UIColor *normalColor = [UIColor greenColor];
??? UIColor *highlightedColor = [UIColor redColor];
??? self.backgroundColor = highlighted ? highlightedColor : normalColor;
}
// 方法二、利用setBackgroundImage:forState:方法
[button setBackgroundImage:[self imageWithColor:[UIColor blueColor]] forState:UIControlStateHighlighted];
- (UIImage *)imageWithColor:(UIColor *)color {
??? CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
??? UIGraphicsBeginImageContext(rect.size);
??? CGContextRef context = UIGraphicsGetCurrentContext();
??? CGContextSetFillColorWithColor(context, [color CGColor]);
??? CGContextFillRect(context, rect);
??? UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
??? UIGraphicsEndImageContext();
??? return image;
}
93嗜逻、關(guān)于圖片拉伸
推薦看這個博客涩僻，講的很詳細(xì)http://blog.csdn.net/q199109106q/article/details/8615661
94、利用runtime獲取一個類所有屬性
- (NSArray *)allPropertyNames:(Class)aClass
{
??? unsigned count;
??? objc_property_t *properties = class_copyPropertyList(aClass, &count);
??? NSMutableArray *rv = [NSMutableArray array];
??? unsigned i;
??? for (i = 0; i < count; i++)
??? {
??????? objc_property_t property = properties[i];
??????? NSString *name = [NSString stringWithUTF8String:property_getName(property)];
??????? [rv addObject:name];
??? }
??? free(properties);
??? return rv;
}
95、設(shè)置textView的某段文字變成其他顏色
- (void)setupTextView:(UITextView *)textView text:(NSString *)text color:(UIColor *)color {
??? NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text];
??? [string addAttribute:NSForegroundColorAttributeName value:color range:[textView.text rangeOfString:text]];
??? [textView setAttributedText:string];
}
96逆日、讓push跳轉(zhuǎn)動畫像modal跳轉(zhuǎn)動畫那樣效果(從下往上推上來)
- (void)push
{
TestViewController *vc = [[TestViewController alloc] init];
??? vc.view.backgroundColor = [UIColor redColor];
??? CATransition* transition = [CATransition animation];
??? transition.duration = 0.4f;
??? transition.type = kCATransitionMoveIn;
??? transition.subtype = kCATransitionFromTop;
??? [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
??? [self.navigationController pushViewController:vc animated:NO];
}
- (void)pop
{
CATransition* transition = [CATransition animation];
??? transition.duration = 0.4f;
??? transition.type = kCATransitionReveal;
??? transition.subtype = kCATransitionFromBottom;
??? [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
??? [self.navigationController popViewControllerAnimated:NO];
}
97嵌巷、上傳圖片太大，壓縮圖片
-(UIImage *)resizeImage:(UIImage *)image
{
??? float actualHeight = image.size.height;
??? float actualWidth = image.size.width;
??? float maxHeight = 300.0;
??? float maxWidth = 400.0;
??? float imgRatio = actualWidth/actualHeight;
??? float maxRatio = maxWidth/maxHeight;
??? float compressionQuality = 0.5;//50 percent compression
??? if (actualHeight > maxHeight || actualWidth > maxWidth)
??? {
??????? if(imgRatio < maxRatio)
??????? {
??????????? //adjust width according to maxHeight
??????????? imgRatio = maxHeight / actualHeight;
??????????? actualWidth = imgRatio * actualWidth;
??????????? actualHeight = maxHeight;
??????? }
??????? else if(imgRatio > maxRatio)
??????? {
??????????? //adjust height according to maxWidth
??????????? imgRatio = maxWidth / actualWidth;
??????????? actualHeight = imgRatio * actualHeight;
??????????? actualWidth = maxWidth;
??????? }
??????? else
??????? {
??????????? actualHeight = maxHeight;
??????????? actualWidth = maxWidth;
??????? }
??? }
??? CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);
??? UIGraphicsBeginImageContext(rect.size);
??? [image drawInRect:rect];
??? UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
??? NSData *imageData = UIImageJPEGRepresentation(img, compressionQuality);
??? UIGraphicsEndImageContext();
??? return [UIImage imageWithData:imageData];
}
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