文本多行时获取标签高度

在detail视图中创建标签。设置相应文本时需要设置标签的高度。

NSString *mytitleString = [discussionData valueForKey:@"Name"];
 CGSize size =  [mytitleString sizeWithFont:[UIFont systemFontOfSize:14.0]  constrainedToSize:CGSizeMake(500, CGFLOAT_MAX)];
 float lbltitleheight = size.height;
 lbltitle.text = mytitleString;

如果文本很多行就无法设置标签的高度了，怎么办？

先给UILabel赋文本，再重新计算，重置uilabel的frame

NSString *mytitleString = [discussionData valueForKey:@"Name"];
 lbltitle.text = mytitleString;
 lbltitle.font=[UIFont systemFontOfSize:14.0];

 CGSize size = [lbltitle.text sizeWithFont:lbltitle.font  constrainedToSize:CGSizeMake(500, CGFLOAT_MAX)];
/////重置高度
lbltitle.frame=CGRectMake(lbltitle.frame.origin.x,lbltitle.frame.origin.y,size.width,size.height);

CGFloat height=[yourlable sizeWithFont:[UIFont fontWithName:@"Arial" size:31] constrainedToSize:CGSizeMake(yourlable.frame.size.width,1000) lineBreakMode:UILineBreakModeWordWrap].height; 

获取label的动态高度