MaterialMenuButton - on click application got crash in both Android and iOS

使用 MainPage.xaml 中显示的 MaterialMenuButton 重现崩溃，然后检查 XF.Material/UI/MaterialMenuButton.cs 中第 131 行附近的 OnViewTouch 以及来自 OnButtonClicked 的调用。确认已填充的 Choices 会显示菜单，而不是在 Android 和 iOS 上引发所报告的异常。

🐛 Bug Report

Expected behavior

• It should work properly and show a popup with menu items.

Reproduction steps

• Add MaterialMenuButton on the page and when clicking on the button it crashes the app.

MainPage.xaml

<material:MaterialMenuButton
            Grid.Row="0" Grid.Column="1"
            ButtonType="Elevated"
            Image="dots_circle"
            HorizontalOptions="End"
            HeightRequest="45"
            WidthRequest="45"
            Choices="{Binding Actions}"
            Command="{Binding ActionSelectCommand}"
            BackgroundColor="Transparent"/>

MainPageViewModel.cs

public MainPageViewModel()
{
      ObservableCollection<MaterialMenuItem> actions = new ObservableCollection<MaterialMenuItem>();
      actions.Add(new MaterialMenuItem() { Text = "Details" });
      actions.Add(new MaterialMenuItem() { Text = "Edit" });
      actions.Add(new MaterialMenuItem() { Text = "Upload Document" });
      actions.Add(new MaterialMenuItem() { Text = "Add Project" });
      Actions = new ObservableCollection<MaterialMenuItem>(actions);
}

private ObservableCollection<MaterialMenuItem> _actions { get; set; }
public ObservableCollection<MaterialMenuItem> Actions
{
     get => _actions;
     set { _actions = value; OnPropertyChanged(nameof(Actions)); }
}

Configuration

• Visual Studio for Mac 2022 Version 17.0.1 (build 72)

Version: 1.x

• XF.Material - 1.8.0

Platform:

• 📱 iOS
• 🤖 Android
• 🏁 WPF
• 🌎 UWP
• 🍎 MacOS
• 📺 tvOS
• 🐒 Xamarin.Forms

Exception Message: Cannot show menu, property Choices is null or has no items

Stack Trace

at XF.Material.Forms.UI.MaterialMenuButton.OnViewTouch (System.Double x, System.Double y) [0x0002c] in Z:\Documents\OpenSource\XF-Material-Library\XF.Material\UI\MaterialMenuButton.cs:131 
  at XF.Material.iOS.Renderers.MaterialMenuRenderer.OnClick () [0x0001b] in Z:\Documents\OpenSource\XF-Material-Library\XF.Material\Platforms\Ios\Renderers\MaterialMenuRenderer.cs:26 
  at Xamarin.Forms.Command+<>c__DisplayClass4_0.<.ctor>b__0 (System.Object o) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Command.cs:74 
  at Xamarin.Forms.Command.Execute (System.Object parameter) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Command.cs:112 
  at XF.Material.Forms.UI.MaterialIconButton.OnButtonClicked (System.Boolean handled) [0x00017] in Z:\Documents\OpenSource\XF-Material-Library\XF.Material\UI\MaterialIconButton.xaml.cs:145 
  at XF.Material.Forms.UI.MaterialMenuButton.OnButtonClicked (System.Boolean handled) [0x00000] in Z:\Documents\OpenSource\XF-Material-Library\XF.Material\UI\MaterialMenuButton.cs:120 
  at XF.Material.Forms.UI.MaterialIconButton.<.ctor>b__13_0 () [0x00000] in Z:\Documents\OpenSource\XF-Material-Library\XF.Material\UI\MaterialIconButton.xaml.cs:47 
  at Xamarin.Forms.Command+<>c__DisplayClass4_0.<.ctor>b__0 (System.Object o) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Command.cs:74 
  at Xamarin.Forms.Command.Execute (System.Object parameter) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Command.cs:112 
  at Xamarin.Forms.ButtonElement.ElementClicked (Xamarin.Forms.VisualElement visualElement, Xamarin.Forms.Internals.IButtonElement ButtonElementManager) [0x00008] in D:\a\1\s\Xamarin.Forms.Core\ButtonElement.cs:60 
  at Xamarin.Forms.Button.SendClicked () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Button.cs:173 
  at Xamarin.Forms.Platform.iOS.ButtonElementManager.OnButtonTouchUpInside (Xamarin.Forms.IButtonController element) [0x00009] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ButtonElementManager.cs:86 
  at Xamarin.Forms.Platform.iOS.ButtonRenderer.OnButtonTouchUpInside (System.Object sender, System.EventArgs eventArgs) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ButtonRenderer.cs:189 
  at UIKit.UIControlEventProxy.Activated () [0x00004] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIControl.cs:38 
--- End of stack trace from previous location where exception was thrown ---

  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00013] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:75 
  at solarcrm.Application.Main (System.String[] args) [0x0001b] in /Users/divyeshbhatt/Documents/sourcetree/APS/src/solarcrm.Mobile.iOS/Main.cs:20