#pragma mark UILabel 自动高度计算
- (
void
) labelAutoHeight:(UILabel *) contentLabel:(NSString *) text {
UIFont *font = [UIFont systemFontOfSize:12];
contentLabel.font = font;
[contentLabel setNumberOfLines:0];
contentLabel.lineBreakMode = UILineBreakModeWordWrap;
contentLabel.backgroundColor = [UIColor greenColor];
contentLabel.tag = 102;
CGSize size = CGSizeMake(320,2000);
CGSize labelsize = [text sizeWithFont:font constrainedToSize:size lineBreakMode:UILineBreakModeWordWrap];
[contentLabel setFrame:CGRectMake(20, 30, 320, labelsize.height)];
}
// 调用方式
<p>
[<span>self</span> <span>labelAutoHeight</span>:contentLabel:text];
</p>
原文：http://my.oschina.net/jilin/blog/372531