动态计算高度

    NSString *titleText = model.name;

    UIFont *titleFont = [UIFont fontWithName:FONT_FZLTH size:30*SCALE_RATIO];

    CGSize size = CGSizeMake(SCREEN_WIDTH - 40, 400);//设置行高上限

    NSDictionary *textDic = [NSDictionary dictionaryWithObjectsAndKeys:titleFont,NSFontAttributeName,nil];

    size = [titleText boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:textDic context:nil].size;