iOS UILabel自适应高度

-(CGSize)sizeWithString:(NSString *)string font:(UIFont *)font

{
CGRect rect = [string boundingRectWithSize:CGSizeMake(320, 8000)//限制最大的宽度和高度
options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading  |NSStringDrawingUsesLineFragmentOrigin//采用换行模式
attributes:@{NSFontAttributeName: font}//传人的字体字典
context:nil];

return rect.size;
}

原文链接：https://segmentfault.com/a/1190000003409601