獲取子視圖所在的父視圖
在開發(fā)中我們經(jīng)常會(huì)遍歷父視圖中的子視圖券膀，那么反過來怎么獲取子視圖的父控制器呢
- (UIViewController *)getViewController
{
UIViewController *VC = nil;
UIResponder *responder = self.nextResponder;
while (responder) {
if ([responder isKindOfClass:[UIViewController class]]) {
VC = (UIViewController *)responder;
break;
}
responder = responder.nextResponder;
}
return VC;
}
控制手機(jī)不鎖屏
[UIApplication sharedApplication].idleTimerDisabled = YES;
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;
}
改變UITableViewHeaderFooterView的背景色
- (instancetype)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithReuseIdentifier:reuseIdentifier];
if (self) {
[self.contentView setBackgroundColor:[[UIColor whiteColor] colorWithAlphaComponent:0.5]];
self.backgroundView = ({
UIView * view = [[UIView alloc] initWithFrame:self.bounds];
view.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0.5];
view;
});
}
return self;
}
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;
}
iOS10.3更換APP icon
if ([UIApplication sharedApplication].supportsAlternateIcons) {
NSLog(@"切換icon");
}else{
NSLog(@"不支持");
return;
}
NSString *iconName = [[UIApplication sharedApplication] alternateIconName];
if (iconName) {
// change to primary icon
[[UIApplication sharedApplication] setAlternateIconName:nil completionHandler:^(NSError * _Nullable error) {
if (error) {
NSLog(@"set icon error: %@",error);
}
NSLog(@"The alternate icon's name is %@",iconName);
}];
}else{
// change to alterante icon
[[UIApplication sharedApplication] setAlternateIconName:@"newIcon" completionHandler:^(NSError * _Nullable error) {
if (error) {
NSLog(@"set icon error: %@",error);
}
NSLog(@"The alternate icon's name is %@",iconName);
}];
}
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)];
}
判斷view是不是指定視圖的子視圖
BOOL isView = [textView isDescendantOfView:self.view];
NSArray 快速求總和 最大值 最小值 和 平均值
NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);
字符串反轉(zhuǎn)
- (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;
}
取圖片某一像素點(diǎn)的顏色 在UIImage的分類中
- (UIColor *)colorAtPixel:(CGPoint)point
{
if (!CGRectContainsPoint(CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), point))
{
return nil;
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
int bytesPerPixel = 4;
int bytesPerRow = bytesPerPixel * 1;
NSUInteger bitsPerComponent = 8;
unsigned char pixelData[4] = {0, 0, 0, 0};
CGContextRef context = CGBitmapContextCreate(pixelData,
1,
1,
bitsPerComponent,
bytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGContextTranslateCTM(context, -point.x, point.y - self.size.height);
CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), self.CGImage);
CGContextRelease(context);
CGFloat red = (CGFloat)pixelData[0] / 255.0f;
CGFloat green = (CGFloat)pixelData[1] / 255.0f;
CGFloat blue = (CGFloat)pixelData[2] / 255.0f;
CGFloat alpha = (CGFloat)pixelData[3] / 255.0f;
return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}
NSArray 快速求總和 最大值 最小值 和 平均值
NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);
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;
}
監(jiān)測IOS設(shè)備是否設(shè)置了代理炉旷，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(@"沒代理");
}
else
{
NSLog(@"設(shè)置了代理");
}
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",@"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;
}
Base64編碼與NSString對(duì)象或NSData對(duì)象的轉(zhuǎn)換
// Create NSData object
NSData *nsdata = [@"iOS Developer Tips encoded in Base64"
dataUsingEncoding:NSUTF8StringEncoding];
// Get NSString from NSData object in Base64
NSString *base64Encoded = [nsdata base64EncodedStringWithOptions:0];
// Print the Base64 encoded string
NSLog(@"Encoded: %@", base64Encoded);
// Let's go the other way...
// NSData from the Base64 encoded str
NSData *nsdataFromBase64String = [[NSData alloc]
initWithBase64EncodedString:base64Encoded options:0];
// Decoded NSString from the NSData
NSString *base64Decoded = [[NSString alloc]
initWithData:nsdataFromBase64String encoding:NSUTF8StringEncoding];
NSLog(@"Decoded: %@", base64Decoded);
UIImage 占用內(nèi)存大小
UIImage *image = [UIImage imageNamed:@"aa"];
NSUInteger size = CGImageGetHeight(image.CGImage) * CGImageGetBytesPerRow(image.CGImage);
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)束艾栋，關(guān)閉"
dispatch_source_cancel(timer);
dispatch_async(dispatch_get_main_queue(), ^{
});
});
dispatch_resume(timer);
圖片上繪制文字 寫一個(gè)UIImage的category
- (UIImage *)imageWithTitle:(NSString *)title fontSize:(CGFloat)fontSize
{
//畫布大小
CGSize size=CGSizeMake(self.size.width,self.size.height);
//創(chuàng)建一個(gè)基于位圖的上下文
UIGraphicsBeginImageContextWithOptions(size,NO,0.0);//opaque:NO scale:0.0
[self drawAtPoint:CGPointMake(0.0,0.0)];
//文字居中顯示在畫布上
NSMutableParagraphStyle* paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
paragraphStyle.alignment=NSTextAlignmentCenter;//文字居中
//計(jì)算文字所占的size,文字居中顯示在畫布上
CGSize sizeText=[title boundingRectWithSize:self.size options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]}context:nil].size;
CGFloat width = self.size.width;
CGFloat height = self.size.height;
CGRect rect = CGRectMake((width-sizeText.width)/2, (height-sizeText.height)/2, sizeText.width, sizeText.height);
//繪制文字
[title drawInRect:rect withAttributes:@{ NSFontAttributeName:[UIFont systemFontOfSize:fontSize],NSForegroundColorAttributeName:[ UIColor whiteColor],NSParagraphStyleAttributeName:paragraphStyle}];
//返回繪制的新圖形
UIImage *newImage= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
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;
}
取上整與取下整
floor(x),有時(shí)候也寫做Floor(x)已慢，其功能是“下取整”抹沪，即取不大于x的最大整數(shù) 例如：
x=3.14件缸，floor(x)=3
y=9.99999公荧，floor(y)=9
與floor函數(shù)對(duì)應(yīng)的是ceil函數(shù)，即上取整函數(shù)微渠。
ceil函數(shù)的作用是求不小于給定實(shí)數(shù)的最小整數(shù)搭幻。
ceil(2)=ceil(1.2)=cei(1.5)=2.00
floor函數(shù)與ceil函數(shù)的返回值均為double型
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;
}
獲取WebView所有的圖片地址
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
{
static NSString * const jsGetImages =
@"function getImages(){\
var objs = document.getElementsByTagName(\"img\");\
var imgScr = '';\
for(var i=0;i<objs.length;i++){\
imgScr = imgScr + objs[i].src + '+';\
};\
return imgScr;\
};";
[webView evaluateJavaScript:jsGetImages completionHandler:nil];
[webView evaluateJavaScript:@"getImages()" completionHandler:^(id _Nullable result, NSError * _Nullable error) {
NSLog(@"%@",result);
}];
}
獲取到webview的高度
CGFloat height = [[self.webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];
navigationBar根據(jù)滑動(dòng)距離的漸變色實(shí)現(xiàn)
- (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;
}
navigationItem的BarButtonItem如何緊靠屏幕右邊界或者左邊界
//方法一
UIImage *img = [[UIImage imageNamed:@"icon_cog"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//寬度為負(fù)數(shù)的固定間距的系統(tǒng)item
UIBarButtonItem *rightNegativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
[rightNegativeSpacer setWidth:-15];
UIBarButtonItem *rightBtnItem1 = [[UIBarButtonItem alloc]initWithImage:img style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonItemClicked:)];
UIBarButtonItem *rightBtnItem2 = [[UIBarButtonItem alloc]initWithImage:img style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonItemClicked:)];
self.navigationItem.rightBarButtonItems = @[rightNegativeSpacer,rightBtnItem1,rightBtnItem2];
//方法二 UIBarButtonItem擴(kuò)展
@interface UIBarButtonItem (Extension)
+ (nullable UIBarButtonItem *)rightItemWithTarget:(nullable id)target action:(nullable SEL)action image:(nullable NSString *)image highImage:(nullable NSString *)highImage titleColor:(nullable UIColor *)titleColor title:(nullable NSString *)title
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
// 設(shè)置圖片
[btn setBackgroundImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];
//設(shè)置文字
[btn setTitle:title forState:UIControlStateNormal];
[btn setTitleColor:titleColor forState:UIControlStateNormal];
btn.titleLabel.font = [UIFont systemFontOfSize:15];
//文字邊距
btn.titleEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -10);
// 設(shè)置尺寸
// btn.size = btn.currentBackgroundImage.size;
[btn sizeToFit];
return [[UIBarButtonItem alloc] initWithCustomView:btn];
}
AFN移除JSON中的NSNull
AFJSONResponseSerializer *response = [AFJSONResponseSerializer serializer];
response.removesKeysWithNullValues = YES;
刪除NSUserDefaults所有記錄
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
隱藏導(dǎo)航時(shí)，側(cè)滑返回動(dòng)畫處理
//隱藏導(dǎo)航頁面（首頁）
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// 隱藏導(dǎo)航欄
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
push出來的頁面
- (void)viewDidLoad {
[super viewDidLoad];
// 顯示導(dǎo)航欄
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
