cell高度自适应

+(CGSize)labelRectWithSize:(CGSize)size

                 LabelText:(NSString *)labelText

                      Font:(UIFont *)font{

    

    NSDictionary  *dic = [NSDictionarydictionaryWithObjectsAndKeys:font, NSFontAttributeName,nil];

    CGSize actualsize = [labelTextboundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOriginattributes:dic context:nil].size;

    

    return actualsize;

    

}