计算UILabel的高度

//计算文本高度

    NSString *lltxt =[[NSString alloc]initWithFormat:@"浏览:%@",[strJson objectForKey:@"visitCount"]];
    NSString *xztxt =[[NSString alloc]initWithFormat:@"下载:%@",[strJson objectForKey:@"downloadCount"]];

    CGSize size = [self caculatorStringSize:text andWid:DEVW-20 andfontsize:14];
    textheight = size.height;

将计算高度写成一个方法，放入父类中，直接调用

-(CGSize)caculatorStringSize:(NSString *)strings andWid:(CGFloat)wid andfontsize:(CGFloat)fontsize
{
    CGSize iszed = CGSizeMake(wid, MAXFLOAT);
    NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:fontsize]};
    CGSize labelsize = [strings boundingRectWithSize:iszed options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading  attributes:attribute context:nil].size;
    // CGSize retSize = CGSizeMake(wid, labelsize.height+20);
    return labelsize;
}