Question

我做了一个自定义条目，主要是隐藏键盘上的焦点。一切都很好，但有一个小问题。

当我通过EntryText=""修改我的vm中的绑定文本时，我的Entry中的文本消失了，但键盘弹出...我在android项目中测试了一个TextChanged监听器，但它没有做出反应当我使用EntryText = ""

时

我的自定义条目如下所示

    [assembly: ExportRenderer(typeof(SoftKeyboardDisabledEntry), typeof(SoftkeyboardDisabledEntryRenderer))]

namespace SkanerDetali.Droid {
 class SoftkeyboardDisabledEntryRenderer: EntryRenderer {
  protected override void OnElementChanged(ElementChangedEventArgs < Entry > e) {
   base.OnElementChanged(e);


   if (Control != null) {
    Control.Click += (sender, evt) => {
     new Handler().Post(delegate {
      var imm = (InputMethodManager) Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
      var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);

      Console.WriteLine(result);
      Control.RequestFocus();
     });
    };

    Control.FocusChange += (sender, evt) => {
     new Handler().Post(delegate {
      try {
       var imm = (InputMethodManager) Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
       var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);
       Console.WriteLine(result);
       Control.RequestFocus();
      } catch (Exception Ex) {
       Console.Write(Ex);
      }
     });
    };
   }
  }

  private void OnPropertyChanging(object sender, PropertyChangingEventArgs propertyChangingEventArgs) {
   // Check if the view is about to get Focus

   if (propertyChangingEventArgs.PropertyName == VisualElement.IsFocusedProperty.PropertyName) {
    // incase if the focus was moved from another Entry
    // Forcefully dismiss the Keyboard 
    InputMethodManager imm = (InputMethodManager) this.Context.GetSystemService(Context.InputMethodService);
    imm.HideSoftInputFromWindow(this.Control.WindowToken, 0);
   }
  }
 }
}

xaml中的条目：

<local:SoftKeyboardDisabledEntry 
                x:Name="SoftKeyboardDisabledEntry"
                Text="{Binding ReadedEAN}"
                IsVisible="True"
            />

android项目监听器中的TextChanged没有重新启动：

   Control.TextChanged += (object sender, Android.Text.TextChangedEventArgs ev) => {
  var imm = (InputMethodManager) Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
  var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);

  Console.WriteLine(result);

                    };

您知道我该如何解决这个问题？我几个小时就在努力......

编辑解决方案......：

我以更好的形式改变了听众：

 Control.TextChanged += (sender, evt) = >{
    new Handler().Post(delegate {
        var imm = (InputMethodManager) Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
        var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);

        Console.WriteLine(result);
    });
};

Answer 1

您可以尝试在自定义渲染器中覆盖OnElementPropertyChanged：

protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
    base.OnElementPropertyChanged(sender, e);

    if (e.PropertyName == nameof(Entry.Text)
        || e.PropertyName == nameof(Entry.IsFocused))
    {
        //if there is change in text or focus state - act 
        // i.e hide or show keyboard?
    }
}

xamarin mvvm - 检测自定义条目渲染器

1 个答案: