文本自适应高度

很多时候我们需要根据文本的大小来定义label的高度:那么如何计算文本的大小呢:

如下:

 UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0, 0, 375, 300)];

        label.text = @"说大声的撒 爱上爱上爱上";

        label.numberOfLines = 0;

        label.textColor = [UIColororangeColor];

        [label release];

        

        NSMutableDictionary *dic= [NSMutableDictionarydictionaryWithObjectsAndKeys:[UIFontsystemFontOfSize:17], NSFontAttributeName,nil];

        CGRect rect = [label.textboundingRectWithSize:CGSizeMake(375, 1000)options:NSStringDrawingUsesLineFragmentOriginattributes:dic context:nil];

        label.frame = CGRectMake(10, 0, 355, rect.size.height + 20);