UILabel的一些小方法

1.调整UILabel的行间距

   NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:building];
   NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
   [paragraphStyle setLineSpacing:6];
   [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [building length])]; 

2.自适应UILabel的高度

第一种方法
   CGSize maxSize = CGSizeMake([[UIScreen mainScreen] bounds].size.width-25, MAXFLOAT);
   CGRect rect1 =
    [building boundingRectWithSize:maxSize
                         options:NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin
                      attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:10]}
                         context:nil];

第二种方法
  [self.introduceLabel sizeToFit];
    CGFloat labelHeight = [self.introduceLabel sizeThatFits:CGSizeMake(self.introduceLabel.frame.size.width, MAXFLOAT)].height;

3.改变UILabel的字体大小和颜色

    NSString * string = [NSString stringWithFormat:@"%@ %@",dict[@"UserNickName"],shop];
    NSRange range = [string rangeOfString:@"["];
    
    NSMutableAttributedString *mAttStri = [[NSMutableAttributedString alloc] initWithString:string];
    
    CGFloat font = 9;
    if (IPHONE_HEIGHT == 667) {
        font = 10;
    }else if(IPHONE_HEIGHT == 736){
        font = 11;
    }
    [mAttStri addAttribute:NSFontAttributeName  value:[UIFont boldSystemFontOfSize:font] range:NSMakeRange(range.location, string.length - range.location)];
    
    [mAttStri addAttribute:NSForegroundColorAttributeName  value:[UIColor colorWithRed:196/255.0 green:196/255.0 blue:196/255.0 alpha:1] range:NSMakeRange(range.location, string.length - range.location)];
    
    self.titleCityLabel.attributedText =mAttStri;