uilable根据字符串长度变化

          CGSize labelSize = [self.itemPrice1.textsizeWithFont:[UIFontsystemFontOfSize:13] constrainedToSize:CGSizeMake(175.0f, 2000.0f)  lineBreakMode:UILineBreakModeWordWrap];

                    self.itemPrice1.frame = CGRectMake(130-labelSize.width-5, self.itemPrice1.frame.origin.y, labelSize.width+4, 13);