#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

    [self labelAutoHeight:contentLabel:text];