c# - PickerView 工具栏的完成按钮不起作用

Question

添加到 pickerview 工具栏的完成按钮， 但是点击完成按钮点击事件不起作用。

    public override void ViewDidLoad(){
         myPickerView = new UIPickerView (RectangleF.Empty){
            AutoresizingMask = UIViewAutoresizing.FlexibleWidth,
            ShowSelectionIndicator = true,
            Model = model,
            Hidden = true,
            BackgroundColor = UIColor.Clear
        };

        toolbar = new UIToolbar();
        toolbar.BarStyle = UIBarStyle.Default;
        toolbar.Translucent = true;
        toolbar.SizeToFit();

// Create a 'done' button for the toolbar and add it to the toolbar
        UIBarButtonItem doneButton = new UIBarButtonItem("Done", UIBarButtonItemStyle.Done,
            (s, e) => {
                Console.WriteLine ("Calling Done!");
                txt_RegistrationType.Text = selectedType;
                txt_Email.ResignFirstResponder();
                txt_UserName.ResignFirstResponder();
                txt_Password.ResignFirstResponder();
                txt_PhoneNumber.ResignFirstResponder();
                txt_ConformPassword.ResignFirstResponder();
            });
        toolbar.SetItems(new UIBarButtonItem[]{doneButton}, true);
        model.PickerChanged += (sender, e) => {
            Console.WriteLine("selected vlaue {0}",e.SelectedValue);
            txt_RegistrationType.Text = e.SelectedValue;
        };

this.myPickerView.AddSubview (toolbar);
myPickerView.Frame = PickerFrameWithSize (myPickerView.SizeThatFits (SizeF.Empty));
View.AddSubview (myPickerView);
myPickerView.AddSubview (toolbar);
}

点击选中的项目

它显示 pickerView“PickerView.Hidden = false”，它显示选择器 View 和带有完成按钮的工具栏。单击工具栏上的完成按钮时，其单击事件不起作用。

请让我知道如何在点击完成按钮上获取事件。

Answer 1

首先，我想指出您两次将“工具栏”添加到当前的“UIPickerView”。一旦:

this.myPickerView.AddSubview (toolbar);

还有一次:

myPickerView.AddSubview (toolbar);

其次，为什么是工具栏？它只会增加项目的复杂性和依赖性。

我的建议是废弃整个代码块，并在此 View 上制作两个单独的控件:

1. 一个按钮

2. 一个 UIPickerView

   public override void ViewDidLoad()
   {
       UIButton button = new UIButton (new RectangleF (5, 5, frame_width, 30));
       button.TouchUpInside += Method;
   
       UIPickerView pickerView = new UIPickerView (new RectangleF (5, 45, frame_width, 180));
       pickerView.Model = model
   
       this.View.AddSubviews (new UIView[]{button, pickerView});
   }
   
   void Method (object sender, eventargs e)
   {
       Console.WriteLine ("Done");
       /*If you want to make the pickerView disappear, 
       you can add a pickerView.Hide() here, and then call a method 
       to redraw the controls on the current view.*/
   }
   

希望对您有所帮助。祝你好运!