UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 320, 50)];    textField.placeholder = @"填写订单";    if ([textField respondsToSelector:@selector(setAttributedPlaceholder:)]) {        UIColor *color = [UIColor redColor];        textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"填写订单" attributes:@{NSForegroundColorAttributeName: color}];    } else {        NSLog(@"Cannot set placeholder text's color, because deployment target is earlier than iOS 6.0");        // TODO: Add fall-back code to set placeholder color.    }    [self.view addSubview:textField];