1.获取view所在的controller

- (UIViewController *)viewController {

for (UIView* next = [self superview]; next; next = next.superview) {

UIResponder *nextResponder = [next nextResponder];

if ([nextResponder isKindOfClass:[UIViewController class]]) {

return (UIViewController *)nextResponder;

}

}

return nil;

}

2.改变图片颜色

UIImageView * praiseImageView = (UIImageView *)tapGesture.view;

UIImage * praiseImage = [[UIImage imageNamed:@"点赞.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

praiseImageView.tintColor = [UIColor colorWithHexString:@"#47a0db" alpha:1.0];

praiseImageView.image = praiseImage;

3.颜色渐变层CAGradientLayer

CAGradientLayer *gradientLayer = [CAGradientLayer layer];

gradientLayer.frame = self.view.bounds;

gradientLayer.colors = @[(__bridge id)[UIColor purpleColor].CGColor,(__bridge id)[UIColor redColor].CGColor];

gradientLayer.startPoint = CGPointMake(0, 0);    // x的相对位置,y的相对位置,如果x不设置为0.5,则渐变色会斜着

gradientLayer.endPoint = CGPointMake(1, 1);

gradientLayer.locations = @[@0.5,@1];    // 各颜色的区间位置

4.数字价格格式化

NSNumberFormatter*formatter = [[NSNumberFormatteralloc]init];

formatter.numberStyle=NSNumberFormatterDecimalStyle;

NSString*newAmount = [formatterstringFromNumber:[NSNumbernumberWithint:123456789]];

（注意传入参数的数据长度，还可用double类型等）

NSNumberFormatter类有个属性numberStyle，是一个枚举型，设置不同的值可以输出不同的数字格式。该枚举包括：

enum{

NSNumberFormatterNoStyle =kCFNumberFormatterNoStyle,

NSNumberFormatterDecimalStyle =kCFNumberFormatterDecimalStyle,

NSNumberFormatterCurrencyStyle =kCFNumberFormatterCurrencyStyle,

NSNumberFormatterPercentStyle =kCFNumberFormatterPercentStyle,

NSNumberFormatterScientificStyle =kCFNumberFormatterScientificStyle,

NSNumberFormatterSpellOutStyle =kCFNumberFormatterSpellOutStyle

};

各个枚举对应输出数字格式的效果如下：

123456789

123,456,789

￥123,456,789.00

-539,222,988%

1.23456789E8

一亿二千三百四十五万六千七百八十九

5.计算时间间隔的组件

使用NSDateComponents可以很方便的计算时间,比如1小时前,20天前,5分钟前等等

6.解决textField和textView输入文字时实时显示富文本时，文本高亮部分显示错误问题

- (void)textViewDidChange:(UITextView *)textView {

UITextRange *selectedRange = [textView markedTextRange];

// 获取高亮字符的位置

UITextPosition *position = [textView positionFromPosition:selectedRange.start offset:0];

// 没有高亮文字是采取处理富文本

if (!position) {   在这里处理输入的文字,使变成富文本

}

}

从 http://www.jianshu.com/p/b6143e5a6cde摘录,谢谢

7. 去除tableView的separator的设置

- (void)tableView:(UITableView*)tableView willDisplayCell:(UITableViewCell*)cell forRowAtIndexPath:(NSIndexPath*)indexPat{

 if([cellrespondsToSelector:@selector(setLayoutMargins:)]) {

[cellsetLayoutMargins:UIEdgeInsetsZero];

 }

 if([cellrespondsToSelector:@selector(setSeparatorInset:)]){

 [cellsetSeparatorInset:UIEdgeInsetsMake(0.0,LabelToXWidth,0.0,0.0)];

 }

}

创建tableView时，仍需设置一下内容

if([_tableViewrespondsToSelector:@selector(setSeparatorInset:)]) {

[_tableViewsetSeparatorInset:UIEdgeInsetsMake(0.0,0.0,0.0,0.0)];

}

 if([_tableViewrespondsToSelector:@selector(setLayoutMargins:)]) {

 [_tableViewsetLayoutMargins:UIEdgeInsetsZero];

 }

  if([_tableViewrespondsToSelector:@selector(cellLayoutMarginsFollowReadableWidth)]) {

  _tableView.cellLayoutMarginsFollowReadableWidth=NO;

  }

8. collectionView的获取到的visibleCells未按照indexPath排序问题

- (NSArray *)getSortedVisibleCellFromCollectionView {

        NSArray * visibleCellArray = [self.collectionView visibleCells];

        NSArray * sortedCellArray  = [visibleCellArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

               NSIndexPath * path1 = [self.collectionView indexPathForCell:obj1];

              NSIndexPath * path2 = [self.collectionView indexPathForCell:obj2];

             return [path1 compare:path2];

       }];

       return sortedCellArray;

}