遍历可变数组的同时删除数组元素
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NSMutableArray *copyArray = [NSMutableArray arrayWithArray:array]; NSString *str1 = @“zhangsan”; for (AddressPerson *perName in copyArray) { if ([[perName name] isEqualToString:str1]) { [array removeObject:perName]; } } |
获取系统当前语言
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NSString *currentLanguage = [[NSLocale preferredLanguages] objectAtIndex:0];NSLog(@"currentlanguage = %@",currentLanguage);if ([currentLanguage containsString:@"zh-Hans"]) { NSLog(@"zh-Hans简体中文");}else if ([currentLanguage containsString:@"zh-Hant"]) { NSLog(@"zh-Hant繁体中文");} |
UITableView的Group样式下顶部空白处理
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UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0.1)];self.tableView.tableHeaderView = view; |
UITableView的plain样式下，取消区头停滞效果
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ CGFloat sectionHeaderHeight = sectionHead.height; if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView;.contentOffset.y>=0) { scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0); } else if(scrollView.contentOffset.y>=sectionHeaderHeight) { scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0); }} |
获取某个view所在的控制器
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- (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;} |
两种方法删除NSUserDefaults所有记录
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//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];} |
打印系统所有已注册的字体名称
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void enumerateFonts(){ for(NSString *familyName in [UIFont familyNames]) { NSLog(@"%@",familyName); NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName]; for(NSString *fontName in fontNames) { NSLog(@"\t|- %@",fontName); } }} |
获取图片某一点的颜色
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- (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;} |
字符串反转
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//第一种：- (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;}//第二种：- (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;} |
禁止锁屏
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//第一种[UIApplication sharedApplication].idleTimerDisabled = YES;//第二种[[UIApplication sharedApplication] setIdleTimerDisabled:YES]; |
模态推出透明界面
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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]; |
iOS跳转到App Store下载应用评分
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[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=APPID"]]; |
手动更改iOS状态栏的颜色
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- (void)setStatusBarBackgroundColor:(UIColor *)color{ UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"]; if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) { statusBar.backgroundColor = color; }} |
判断当前ViewController是push还是present的方式显示
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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];} |
获取实际使用的LaunchImage图片
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- (NSString *)getLaunchImageName{ CGSize viewSize = self.window.bounds.size; // 竖屏 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;} |
iOS在当前屏幕获取第一响应
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UIWindow * keyWindow = [[UIApplication sharedApplication] keyWindow];UIView * firstResponder = [keyWindow performSelector:@selector(firstResponder)]; |
判断对象是否遵循了某协议
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if ([self.selectedController conformsToProtocol:@protocol(RefreshPtotocol)]){ [self.selectedController performSelector:@selector(onTriggerRefresh)];} |
判断view是不是指定视图的子视图
BOOL isView = [textView isDescendantOfView:self.view];
NSArray 快速求总和 最大值 最小值 和 平均值
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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); |
修改UITextField中Placeholder的文字颜色
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
获取一个类的所有子类
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+ (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;} |
阿拉伯数字转中文格式
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+(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 = @[@"个",@"十",@"百",@"千",@"万",@"十",@"百",@"千",@"亿",@"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;} |
取消UICollectionView的隐式动画
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//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];}]; |
判断邮箱格式是否正确的代码
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-(BOOL)isValidateEmail:(NSString *)email { NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex]; return [emailTest evaluateWithObject:email]; } |
iOS中UITextField的字数限制
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//在viewDidLoad中注册<UITextFieldTextDidChangeNotification>通知[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textFiledEditChanged:) name:@"UITextFieldTextDidChangeNotification" object:myTextField];//实现监听方法#pragma mark - Notification Method-(void)textFieldEditChanged:(NSNotification *)obj{ UITextField *textField = (UITextField *)obj.object; NSString *toBeString = textField.text; //获取高亮部分 UITextRange *selectedRange = [textField markedTextRange]; UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0]; // 没有高亮选择的字，则对已输入的文字进行字数统计和限制 if (!position) { if (toBeString.length > MAX_STARWORDS_LENGTH) { NSRange rangeIndex = [toBeString rangeOfComposedCharacterSequenceAtIndex:MAX_STARWORDS_LENGTH]; if (rangeIndex.length == 1) { textField.text = [toBeString substringToIndex:MAX_STARWORDS_LENGTH]; } else { NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, MAX_STARWORDS_LENGTH)]; textField.text = [toBeString substringWithRange:rangeRange]; } } }} |
小伙伴们，今天就分享到这里，下期更精彩！
