选择器重视 MAUI 中的本地化

Question

在 MAUI 中本地化选取器值的正确方法是什么？到目前为止我只有一个想法：

使用

LocalizationResourceManager.Maui

。但对于选择器值，当应用程序本地化已更改时，直到应用程序重新启动为止，它不起作用。

<Picker
    x:Name="NativeLanguagePicker"
    ItemsSource="{Binding NativeLanguageSetting.Options}"
    SelectedItem ="{Binding NativeLanguageSetting.Picked, Mode=TwoWay}"
    ItemDisplayBinding="{localization:TranslateBinding Localization, TranslateValue=True}"
    Style="{DynamicResource SettingPicker}">
</Picker>

在毛伊岛有什么办法可以做到这一点吗？因为整个应用程序都遵循文化变化并进行相应的翻译（除了选择器之外）。看起来应该有一种方法可以优雅地做到这一点。

Answer 1

您可以参考以下解决方案。 要求是您已经为您想要的不同语言制作了资源。

让我们从实施开始。我们有一个选择器和一个单选按钮组。选择器有一个能够发挥所有魔力的行为。

<Picker x:Name="MyPicker" Title="{x:Static localization:AppResources.PickerTitle}">
   <Picker.Behaviors>
      <local:LocalizedPickerBehavior />
   </Picker.Behaviors>
</Picker>
<local:RadioButtonGroup />

然后我们创建

Behaviour

。在这里，我们初始化 Messenger，它会告诉

Behaviour

我们已经更改了语言。

public class LocalizedPickerBehavior : Behavior<Picker>
{
    protected override void OnAttachedTo(Picker picker)
    {
        base.OnAttachedTo(picker);

        // Set the ItemsSource of the Picker
        SetItemsSource(picker);


        // Listen for the LanguageChanged notification
        WeakReferenceMessenger.Default.Register<LocalizedPickerBehaviorMessage>(this, (recipient, message) => {
            var culture = new CultureInfo(message.Value);
            CultureInfo.CurrentUICulture = culture;
            SetItemsSource(picker);
        });
    }

    private void SetItemsSource(Picker picker)
    {
        var option1 = AppResources.Option1;
        var option2 = AppResources.Option2;
        var option3 = AppResources.Option3;

        picker.Title = AppResources.PickerTitle;
        var currentIndex = picker.SelectedIndex;
        picker.ItemsSource = new List<string> { option1, option2, option3 };
        picker.SelectedIndex = currentIndex;
    }

    protected override void OnDetachingFrom(Picker picker)
    {
        base.OnDetachingFrom(picker);

        picker.ItemsSource = null;

        WeakReferenceMessenger.Default.Unregister<LocalizedPickerBehavior>(this);
    }
}

对于信使，我们需要使用我们想要更改为的语言发送一条消息。

public class LocalizedPickerBehaviorMessage : ValueChangedMessage<string>
{
    public LocalizedPickerBehaviorMessage(string lang) : base(lang)
    {
    }
}

我们添加一个简单的单选按钮，将消息发送到我们的

Behaviour

。

public class RadioButtonGroup : StackLayout
{
    public RadioButton RadioButton1 { get; private set; }
    public RadioButton RadioButton2 { get; private set; }

    public RadioButtonGroup()
    {
        Orientation = StackOrientation.Horizontal;
        RadioButton1 = new RadioButton { Content = "English" };
        RadioButton2 = new RadioButton { Content = "Swedish" };

        RadioButton1.CheckedChanged += OnRadioButtonCheckedChanged;
        RadioButton2.CheckedChanged += OnRadioButtonCheckedChanged;

        Children.Add(RadioButton1);
        Children.Add(RadioButton2);

        RadioButton1.IsChecked = true;
    }

    private void OnRadioButtonCheckedChanged(object sender, CheckedChangedEventArgs e)
    {
        var radioButton = (RadioButton)sender;

        if (radioButton == RadioButton1 && RadioButton1.IsChecked)
        {
            RadioButton2.IsChecked = false;
            WeakReferenceMessenger.Default.Send(new LocalizedPickerBehaviorMessage("en"));
        }
        else if (radioButton == RadioButton2 && RadioButton2.IsChecked)
        {
            RadioButton1.IsChecked = false;
            WeakReferenceMessenger.Default.Send(new LocalizedPickerBehaviorMessage("sv"));
        }
    }
}

结果是：