NSString *string = @" spaces in front and at the end "; NSString *trimmedString = [string stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
self.orderCost.text = [NSStringstringWithFormat:@"%.1f元",self.order.cost.floatValue]; %.1f 表示小数点一位,%.2f 表示小数点2位,依次类推 格式定义The format specifiers supported by the NSString formatting methods and CFString formatting functions follow the IEEE printf