iOS 把你的UILabel多彩起来

#pragma mark - 改变Label字体颜色
- (void)differentColorWithLabel:(UILabel *)label {
    
   NSString *titlStr = label.text;
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:titlStr];
    
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,4)];
    
    label.attributedText = str;
}