UILabel的行间距，一般都是用下面的方法解决
UILabel*label = [[UILabelalloc]initWithFrame:labelFrame];
[labelsetBackgroundColor:[UIColorclearColor]];
[labelsetTextColor:textColor];
[labelsetNumberOfLines:0];
label.font= textFont;
NSString*labelText =@"我是内容，我是内容，我是内容，我是内容，我是内容。";
NSMutableAttributedString*attributedString = [[NSMutableAttributedStringalloc]initWithString:labelText];
NSMutableParagraphStyle*paragraphStyle = [[NSMutableParagraphStylealloc]init];
[paragraphStylesetLineSpacing:LINESPACE];//调整行间距
[attributedStringaddAttribute:NSParagraphStyleAttributeNamevalue:paragraphStylerange:NSMakeRange(0, [labelTextlength])];
label.attributedText= attributedString;
[contentViewaddSubview:label];[labelsizeToFit];
