Lable 换行动态计算高度（2种）

第一种：

CGSize maxSize = CGSizeMake(TheViewWithWidth - 80 - 34, MAXFLOAT);

CGFloat textH = [self.rigthLabel.text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:14]} context:nil].size.height;

CGRect dateFrame =CGRectMake(2, 140, CGRectGetWidth(self.frame)-5, labelSize.height);

self.rigthLabel.height = maxSize.height;

第二种：

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];

paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;

NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:14.f], NSParagraphStyleAttributeName:paragraphStyle.copy};

CGSize maxSize = [self.rigthLabel.text boundingRectWithSize:CGSizeMake(TheViewWithWidth - 80 - 34, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;

 self.rigthLabel.height = maxSize.height;

Lable 换行动态计算高度（2种）

原文：http://www.cnblogs.com/yibadao/p/6385574.html