命令未在 iPhone 设备上单击按钮时触发，但在 iOS 仿真器和 Android 设备上触发

Question

当我在 Android 设备和 iOS 模拟器上测试我的 Xamarin Form 应用程序时，按钮单击上的所有命令都可以正常工作。

但是，当我在 iPhone 12 pro 上测试应用程序（在 iPhone 上调试并从 TestFlight 下载应用程序）时，命令不会在按钮单击时触发。

我已经进行了数小时的搜索，但仍然无法找出我的代码有什么问题。 提前致谢！

HomeAnonymousPage.Xml ：

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MyMobile.Views.HomeAnonymousPage"
             xmlns:vm="clr-namespace:MyMobile.ViewModels"
             Title="{Binding Title}"
             Shell.NavBarIsVisible="False">

    <ContentPage.BindingContext>
        <vm:HomeAnonymousViewModel />
    </ContentPage.BindingContext>

    <ContentPage.Resources>
        <ResourceDictionary>
            <Color x:Key="Accent">#96d1ff</Color>
            <Color x:Key="VivaOrange">#F06036</Color>
        </ResourceDictionary>
    </ContentPage.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <StackLayout BackgroundColor="{StaticResource Accent}" VerticalOptions="FillAndExpand" HorizontalOptions="Fill">
            <StackLayout Orientation="Horizontal" HorizontalOptions="Center" VerticalOptions="Center">
                <ContentView Padding="0,40,0,40" VerticalOptions="FillAndExpand">
                    <Image Source="my_logo.png" VerticalOptions="Center" HeightRequest="64" />
                </ContentView>
            </StackLayout>
        </StackLayout>
        <ScrollView Grid.Row="1">
            <StackLayout Orientation="Vertical" Padding="30,24,30,24" Spacing="10">                
                
                <Button x:Name="btnOpenViva" Margin="0,10,0,0" Text="Learn more"
                        Command="{Binding OpenMyWebCommand}"
                        BackgroundColor="{StaticResource Primary}"
                        TextColor="White" />

                <Button x:Name="btnLogin" Margin="0,10,0,0" Text="Login"
                        Command="{Binding OpenLoginPageCommand}"
                        BackgroundColor="{StaticResource VivaOrange}"
                        TextColor="White" />

            </StackLayout>
        </ScrollView>

    </Grid>
</ContentPage>

主页匿名视图模型：

    public class HomeAnonymousViewModel : BaseViewModel
    {    
        public HomeAnonymousViewModel()
        {
            Title = "my Mobile";
            OpenMyWebCommand = new Command(async () => await Browser.OpenAsync("google.com"));
            OpenLoginPageCommand = new Command(async () => await Shell.Current.GoToAsync($"{ nameof(LoginPage)}?TargetURL={AppSettingsManager.Settings["HomeUriPath"]}"));
        }

        public ICommand OpenMyWebCommand { get; set;}
        public ICommand OpenLoginPageCommand { get; set;}
    }

HomeAnonymousPage.cs：

   [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class HomeAnonymousPage : ContentPage
    {
        HomeAnonymousViewModel vm;

        public HomeAnonymousPage()
        {
            InitializeComponent();

            vm = (HomeAnonymousViewModel)this.BindingContext;
            
        }

        protected override async void OnAppearing()
        {
            base.OnAppearing();
        }

    }