- 1、UITableView的Plain樣式下底部多余行處理
關(guān)鍵代碼
//高度可自調(diào)
UIView *vi = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, kScreen_Height)];
vi.backgroundColor = [UIColor whiteColor]; //顏色也可調(diào)，最好還是按照軟件主題色調(diào)來(lái)選
self.tableView.tableFooterView = vi;
- 2 旨剥、獲取某個(gè)View所在的控制器
- (UIViewController *)viewController
{
UIViewController *viewController = nil;
UIResponder *next = self.nextResponder;
while (next)
{
if ([next isKindOfClass:[UIViewController class]])
{
viewController = (UIViewController *)next;
break;
}
next = next.nextResponder;
}
return viewController;
}
- 3咧欣、清空NSUserDefaults所有記錄
//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
//方法二
- (void)resetDefaults
{
NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [defs dictionaryRepresentation];
for (id key in dict)
{
[defs removeObjectForKey:key];
}
[defs synchronize];
}
- 4、打印系統(tǒng)所有已注冊(cè)的字體名稱
#pragma mark - 打印系統(tǒng)所有已注冊(cè)的字體名稱
void enumerateFonts()
{
for(NSString *familyName in [UIFont familyNames])
{
NSLog(@"%@",familyName);
NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
for(NSString *fontName in fontNames)
{
NSLog(@"\t|- %@",fontName);
}
}
}
- 5泞边、獲取圖片某一點(diǎn)的顏色
- (UIColor*) getPixelColorAtLocation:(CGPoint)point inImage:(UIImage *)image
{
UIColor* color = nil;
CGImageRef inImage = image.CGImage;
CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];
if (cgctx == NULL)
{
return nil; /* error */
}
size_t w = CGImageGetWidth(inImage);
size_t h = CGImageGetHeight(inImage);
CGRect rect = {{0,0},{w,h}};
CGContextDrawImage(cgctx, rect, inImage);
unsigned char* data = CGBitmapContextGetData (cgctx);
if (data != NULL)
{
int offset = 4*((w*round(point.y))+round(point.x));
int alpha = data[offset];
int red = data[offset+1];
int green = data[offset+2];
int blue = data[offset+3];
color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:
(blue/255.0f) alpha:(alpha/255.0f)];
}
CGContextRelease(cgctx);
if (data)
{
free(data);
}
return color;
}
- 6 该押、字符串反轉(zhuǎn)
第一種：
- (NSString *)reverseWordsInString:(NSString *)str
{
NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:str.length];
for (NSInteger i = str.length - 1; i >= 0 ; i --)
{
unichar ch = [str characterAtIndex:i];
[newString appendFormat:@"%c", ch];
}
return newString;
}
//第二種：
- (NSString*)reverseWordsInString:(NSString*)str
{
NSMutableString *reverString = [NSMutableString stringWithCapacity:str.length];
[str enumerateSubstringsInRange:NSMakeRange(0, str.length) options:NSStringEnumerationReverse | NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[reverString appendString:substring];
}];
return reverString;
}
- 7、禁止鎖屏
默認(rèn)情況下阵谚，當(dāng)設(shè)備一段時(shí)間沒(méi)有觸控動(dòng)作時(shí)蚕礼，iOS會(huì)鎖住屏幕。但有一些應(yīng)用是不需要鎖屏的梢什，比如視頻播放器奠蹬。
[UIApplication sharedApplication].idleTimerDisabled = YES; 或
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
- 8、模態(tài)推出透明界面
UIViewController *vc = [[UIViewController alloc] init];
UINavigationController *na = [[UINavigationController alloc] initWithRootViewController:vc];
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
{
na.modalPresentationStyle = UIModalPresentationOverCurrentContext;
}
else
{
self.modalPresentationStyle = UIModalPresentationCurrentContext;
}
[self presentViewController:na animated:YES completion:nil];
- 9嗡午、字符串按多個(gè)符號(hào)分割
//原始字符串
NSString *str = @"abc,veh.lslsl,eee";
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@",."]; //"分割的字符串是",.""
NSArray *arr = [str componentsSeparatedByCharactersInSet:set];
[arr enumerateObjectsUsingBlock:^(NSString * obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@" obj -- %@",obj);
//打印如下
// obj -- abc
// obj -- veh
// obj -- lslsl
// obj -- eee
}];
- 10囤躁、iOS應(yīng)用跳轉(zhuǎn)到指定URL
NSURL *url = [NSURL URLWithString:@"您APP在應(yīng)用商店的地址"];
//iOS 10以前
// [[UIApplication sharedApplication] openURL:url];
//iOS10之后
NSDictionary *dict = @{@"key":@"value"}; //用于對(duì)象間通信
[[UIApplication sharedApplication] openURL:url options:dict completionHandler:^(BOOL success) {
//打開(kāi)成功之后會(huì)回到主線程
NSLog(@"當(dāng)前線程 ... %@",[NSThread currentThread]);
}];
- 11、iOS 獲取漢字的拼音
- (NSString *)transform:(NSString *)chinese
{
//將NSString裝換成NSMutableString
NSMutableString *pinyin = [chinese mutableCopy];
//將漢字轉(zhuǎn)換為拼音(帶音標(biāo))
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformMandarinLatin, NO);
NSLog(@"%@", pinyin);
//去掉拼音的音標(biāo)
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformStripCombiningMarks, NO);
NSLog(@"%@", pinyin);
//返回最近結(jié)果
return pinyin;
}
- 12 荔睹、手動(dòng)更改iOS狀態(tài)欄的顏色
- (void)setStatusBarBackgroundColor:(UIColor *)color
{
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
if ([statusBar respondsToSelector:@selector(setBackgroundColor:)])
{
statusBar.backgroundColor = color;
}
}
- 13 狸演、判斷當(dāng)前ViewController是push還是present的方式顯示的
NSArray *viewcontrollers = self.navigationController.viewControllers;
if (viewcontrollers.count > 1)
{
if ([viewcontrollers objectAtIndex:viewcontrollers.count - 1] == self)
{
//push方式
[self.navigationController popViewControllerAnimated:YES];
}
}
else
{
//present方式
[self dismissViewControllerAnimated:YES completion:nil];
}
- 14 、獲取實(shí)際使用的LaunchImage圖片
- (NSString *)getLaunchImageName
{
CGSize viewSize = self.window.bounds.size;
// 豎屏
NSString *viewOrientation = @"Portrait";
NSString *launchImageName = nil;
NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
for (NSDictionary* dict in imagesDict)
{
CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
{
launchImageName = dict[@"UILaunchImageName"];
}
}
return launchImageName;
}
- 15 僻他、iOS在當(dāng)前屏幕獲取第一響應(yīng)
UIWindow * keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView * firstResponder = [keyWindow performSelector:@selector(firstResponder)];
- 16 宵距、判斷對(duì)象是否遵循了某協(xié)議
if ([self.selectedController conformsToProtocol:@protocol(RefreshPtotocol)])
{
[self.selectedController performSelector:@selector(onTriggerRefresh)];
}
- 17 、判斷view是不是指定視圖的子視圖
BOOL isView = [textView isDescendantOfView:self.view];
- 18 吨拗、修改UITextField中Placeholder的文字顏色
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
- 19 满哪、關(guān)于NSDateFormatter的格式
G: 公元時(shí)代，例如AD公元
yy: 年的后2位
yyyy: 完整年
MM: 月劝篷，顯示為1-12
MMM: 月哨鸭，顯示為英文月份簡(jiǎn)寫(xiě),如 Jan
MMMM: 月，顯示為英文月份全稱娇妓，如 Janualy
dd: 日像鸡，2位數(shù)表示，如02
d: 日哈恰，1-2位顯示坟桅，如 2
EEE: 簡(jiǎn)寫(xiě)星期幾，如Sun
EEEE: 全寫(xiě)星期幾蕊蝗，如Sunday
aa: 上下午，AM/PM
H: 時(shí)赖舟，24小時(shí)制蓬戚，0-23
K：時(shí)，12小時(shí)制宾抓，0-11
m: 分子漩，1-2位
mm: 分豫喧，2位
s: 秒，1-2位
ss: 秒幢泼，2位
S: 毫秒
- 20 紧显、獲取一個(gè)類的所有子類
+ (NSArray *) allSubclasses
{
Class myClass = [self class];
NSMutableArray *mySubclasses = [NSMutableArray array];
unsigned int numOfClasses;
Class *classes = objc_copyClassList(&numOfClasses;);
for (unsigned int ci = 0; ci < numOfClasses; ci++)
{
Class superClass = classes[ci];
do{
superClass = class_getSuperclass(superClass);
} while (superClass && superClass != myClass);
if (superClass)
{
[mySubclasses addObject: classes[ci]];
}
}
free(classes);
return mySubclasses;
}
- 21、監(jiān)測(cè)IOS設(shè)備是否設(shè)置了代理缕棵，需要CFNetwork.framework
NSDictionary *proxySettings = (__bridge NSDictionary *)(CFNetworkCopySystemProxySettings());
NSArray *proxies = (__bridge NSArray *)(CFNetworkCopyProxiesForURL((__bridge CFURLRef _Nonnull)([NSURL URLWithString:@"http://www.baidu.com"]), (__bridge CFDictionaryRef _Nonnull)(proxySettings)));
NSLog(@"\n%@",proxies);
NSDictionary *settings = proxies[0];
NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyHostNameKey]);
NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyPortNumberKey]);
NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyTypeKey]);
if ([[settings objectForKey:(NSString *)kCFProxyTypeKey] isEqualToString:@"kCFProxyTypeNone"])
{
NSLog(@"沒(méi)代理");
}
else
{
NSLog(@"設(shè)置了代理");
}
- 22孵班、阿拉伯?dāng)?shù)字轉(zhuǎn)中文格式
+(NSString *)translation:(NSString *)arebic
{
NSString *str = arebic;
NSArray *arabic_numerals = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0"];
NSArray *chinese_numerals = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"零"];
NSArray *digits = @[@"個(gè)",@"十",@"百",@"千",@"萬(wàn)",@"十",@"百",@"千",@"億",@"十",@"百",@"千",@"兆"];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];
NSMutableArray *sums = [NSMutableArray array];
for (int i = 0; i < str.length; i ++) {
NSString *substr = [str substringWithRange:NSMakeRange(i, 1)];
NSString *a = [dictionary objectForKey:substr];
NSString *b = digits[str.length -i-1];
NSString *sum = [a stringByAppendingString:b];
if ([a isEqualToString:chinese_numerals[9]])
{
if([b isEqualToString:digits[4]] || [b isEqualToString:digits[8]])
{
sum = b;
if ([[sums lastObject] isEqualToString:chinese_numerals[9]])
{
[sums removeLastObject];
}
}else
{
sum = chinese_numerals[9];
}
if ([[sums lastObject] isEqualToString:sum])
{
continue;
}
}
[sums addObject:sum];
}
NSString *sumStr = [sums componentsJoinedByString:@""];
NSString *chinese = [sumStr substringToIndex:sumStr.length-1];
NSLog(@"%@",str);
NSLog(@"%@",chinese);
return chinese;
}
- 23 、取消UICollectionView的隱式動(dòng)畫(huà)
下面幾種方法都可以幫你去除這些動(dòng)畫(huà)
UICollectionView在reloadItems的時(shí)候招驴，默認(rèn)會(huì)附加一個(gè)隱式的fade動(dòng)畫(huà)篙程，有時(shí)候很討厭，尤其是當(dāng)你的cell是復(fù)合cell的情況下(比如cell使用到了UIStackView)别厘。
//方法一
[UIView performWithoutAnimation:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
}];
//方法二
[UIView animateWithDuration:0 animations:^{
[collectionView performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
} completion:nil];
}];
//方法三
[UIView setAnimationsEnabled:NO];
[self.trackPanel performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
} completion:^(BOOL finished) {
[UIView setAnimationsEnabled:YES];
}];
- 24 虱饿、GCD timer定時(shí)器
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
dispatch_source_set_timer(timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒執(zhí)行
dispatch_source_set_event_handler(timer, ^{
//@"倒計(jì)時(shí)結(jié)束，關(guān)閉"
dispatch_source_cancel(timer);
dispatch_async(dispatch_get_main_queue(), ^{
});
});
dispatch_resume(timer);
- 25 触趴、計(jì)算文件大小
//文件大小
- (long long)fileSizeAtPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path])
{
long long size = [fileManager attributesOfItemAtPath:path error:nil].fileSize;
return size;
}
return 0;
}
//文件夾大小
- (long long)folderSizeAtPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
long long folderSize = 0;
if ([fileManager fileExistsAtPath:path])
{
NSArray *childerFiles = [fileManager subpathsAtPath:path];
for (NSString *fileName in childerFiles)
{
NSString *fileAbsolutePath = [path stringByAppendingPathComponent:fileName];
if ([fileManager fileExistsAtPath:fileAbsolutePath])
{
long long size = [fileManager attributesOfItemAtPath:fileAbsolutePath error:nil].fileSize;
folderSize += size;
}
}
}
return folderSize;
}
- 26 氮发、UIView設(shè)置部分圓角
你是不是也遇到過(guò)這樣的問(wèn)題，一個(gè)button或者label冗懦，只要右邊的兩個(gè)角圓角爽冕，或者只要一個(gè)圓角。該怎么辦呢批狐。這就需要圖層蒙版來(lái)幫助我們了
CGRect rect = view.bounds;
CGSize radio = CGSizeMake(30, 30);//圓角尺寸
UIRectCorner corner = UIRectCornerTopLeft|UIRectCornerTopRight;//這只圓角位置
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:corner cornerRadii:radio];
CAShapeLayer *masklayer = [[CAShapeLayer alloc]init];//創(chuàng)建shapelayer
masklayer.frame = view.bounds;
masklayer.path = path.CGPath;//設(shè)置路徑
view.layer.mask = masklayer;
- 27 扇售、去掉導(dǎo)航欄返回的back標(biāo)題
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)forBarMetrics:UIBarMetricsDefault];
- 28 、字符串中是否含有中文
+ (BOOL)checkIsChinese:(NSString *)string
{
for (int i=0; i<string.length; i++)
{
unichar ch = [string characterAtIndex:i];
if (0x4E00 <= ch && ch <= 0x9FA5)
{
return YES;
}
}
return NO;
}
- 29 嚣艇、判斷兩個(gè)日期是否在同一周 寫(xiě)在NSDate的category里面
- (BOOL)isSameDateWithDate:(NSDate *)date
{
//日期間隔大于七天之間返回NO
if (fabs([self timeIntervalSinceDate:date]) >= 7 * 24 *3600)
{
return NO;
}
NSCalendar *calender = [NSCalendar currentCalendar];
calender.firstWeekday = 2;//設(shè)置每周第一天從周一開(kāi)始
//計(jì)算兩個(gè)日期分別為這年第幾周
NSUInteger countSelf = [calender ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitYear forDate:self];
NSUInteger countDate = [calender ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitYear forDate:date];
//相等就在同一周承冰，不相等就不在同一周
return countSelf == countDate;
}
- 30 、獲取手機(jī)安裝的應(yīng)用
Class c =NSClassFromString(@"LSApplicationWorkspace");
id s = [(id)c performSelector:NSSelectorFromString(@"defaultWorkspace")];
NSArray *array = [s performSelector:NSSelectorFromString(@"allInstalledApplications")];
for (id item in array)
{
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"applicationIdentifier")]);
//NSLog(@"%@",[item performSelector:NSSelectorFromString(@"bundleIdentifier")]);
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"bundleVersion")]);
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"shortVersionString")]);
}
- 31 食零、 navigationBar變?yōu)榧兺该?/li>
//第一種方法
//導(dǎo)航欄純透明
[self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
//去掉導(dǎo)航欄底部的黑線
self.navigationBar.shadowImage = [UIImage new];
//第二種方法
[[self.navigationBar subviews] objectAtIndex:0].alpha = 0;
tabBar同理
[self.tabBar setBackgroundImage:[UIImage new]];
self.tabBar.shadowImage = [UIImage new];
- 32 困乒、navigationBar根據(jù)滑動(dòng)距離的漸變色實(shí)現(xiàn)
//第一種
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetToShow = 200.0;//滑動(dòng)多少就完全顯示
CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow;
[[self.navigationController.navigationBar subviews] objectAtIndex:0].alpha = alpha;
}
//第二種
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetToShow = 200.0;
CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow;
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
[self.navigationController.navigationBar setBackgroundImage:[self imageWithColor:[[UIColor orangeColor]colorWithAlphaComponent:alpha]] forBarMetrics:UIBarMetricsDefault];
}
- 33 //生成一張純色的圖片
- (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 *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
- 34 、相關(guān)路徑
iOS 開(kāi)發(fā)中一些相關(guān)的路徑
模擬器的位置:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs
文檔安裝位置:
/Applications/Xcode.app/Contents/Developer/Documentation/DocSets
插件保存路徑:
~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins
自定義代碼段的保存路徑:
~/Library/Developer/Xcode/UserData/CodeSnippets/
如果找不到CodeSnippets文件夾贰谣，可以自己新建一個(gè)CodeSnippets文件夾娜搂。
描述文件路徑
~/Library/MobileDevice/Provisioning Profiles
navigationItem的BarButtonItem如何緊靠屏幕右邊界或者左邊界？
