调整Lable字体行间距

/**
    调整label.text字体间距
 */
- (void)changeHeightOfLabelLineWithContentLabel:(UILabel*)contentLabel
{
    NSMutableAttributedString*attributedString = [[NSMutableAttributedStringalloc]initWithString:contentLabel.text];
   
    NSMutableParagraphStyle*paragraphStyle = [[NSMutableParagraphStylealloc]init];
   
    [paragraphStyle setLineSpacing:5];
   
    [attributedString addAttribute:NSParagraphStyleAttributeNamevalue:paragraphStylerange:NSMakeRange(0, contentLabel.text.length)];
   
    contentLabel.attributedText= attributedString;
   
    //调节高度
   
    CGSize size = CGSizeMake(contentLabel.frame.size.width,500000);
   
    [contentLabel sizeThatFits:size];

}