如何为所有的PickerViews创建单一的完成和取消按钮？

// 创建自定义工具栏
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStylePlain target:self action:@selector(cancelButtonTapped)];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(doneButtonTapped)];
toolbar.items = @[cancelButton, flexibleSpace, doneButton];

// 将工具栏设置为PickerView的输入视图
pickerView1.inputView = pickerView2.inputView = toolbar;

// 完成按钮的点击事件处理
- (void)doneButtonTapped {
    // 获取PickerView1和PickerView2的选中值
    NSString *selectedValue1 = [dataArray1 objectAtIndex:[pickerView1 selectedRowInComponent:0]];
    NSString *selectedValue2 = [dataArray2 objectAtIndex:[pickerView2 selectedRowInComponent:0]];

    // 处理选中的值
    // ...

    // 隐藏PickerView
    [pickerView1 resignFirstResponder];
    [pickerView2 resignFirstResponder];
}

// 取消按钮的点击事件处理
- (void)cancelButtonTapped {
    // 隐藏PickerView
    [pickerView1 resignFirstResponder];
    [pickerView2 resignFirstResponder];
}

// 创建自定义工具栏
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 44))
let cancelButton = UIBarButtonItem(title: "取消", style: .plain, target: self, action: #selector(cancelButtonTapped))
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let doneButton = UIBarButtonItem(title: "完成", style: .done, target: self, action: #selector(doneButtonTapped))
toolbar.items = [cancelButton, flexibleSpace, doneButton]

// 将工具栏设置为PickerView的输入视图
pickerView1.inputView = pickerView2.inputView = toolbar

// 完成按钮的点击事件处理
@objc func doneButtonTapped() {
    // 获取PickerView1和PickerView2的选中值
    let selectedValue1 = dataArray1[pickerView1.selectedRow(inComponent: 0)]
    let selectedValue2 = dataArray2[pickerView2.selectedRow(inComponent: 0)]

    // 处理选中的值
    // ...

    // 隐藏PickerView
    pickerView1.resignFirstResponder()
    pickerView2.resignFirstResponder()
}

// 取消按钮的点击事件处理
@objc func cancelButtonTapped() {
    // 隐藏PickerView
    pickerView1.resignFirstResponder()
    pickerView2.resignFirstResponder()
}