如何在菜单栏中更改Xamarin后退按钮? [英] How to change Xamarin back button in menu bar?

问题描述

这就是我所拥有的:

这就是我想要得到的:

如果导航堆栈中没有页面，则标题图标将在左上角，否则将有后退箭头和后退"文本. 我没有找到用于自定义它的任何选项，这有可能吗?

If there is no pages in navigation stack, then title icon will be in left corner, else there will be back arrow and "Back" text. I didn't find any options to customize it, is it possible at all?

推荐答案

如果您在NavigationPage中使用MasterPage，则可以将箭头更改为汉堡包图标:

You can change arrow to hamburger icon if you use your MasterPage within NavigationPage:

Detail = new NavigationPage(masterPage);

如果要隐藏图标-它仅适用于Android.可以使用自定义渲染器解决此问题( http://developer. xamarin.com/guides/cross-platform/xamarin-forms/custom-renderer/):

If you want to hide icon - it only applies to Android. It can be solved with custom renderer (http://developer.xamarin.com/guides/cross-platform/xamarin-forms/custom-renderer/):

[assembly:ExportRenderer (typeof(NavigationPage), typeof(CustomNavigationRenderer ))]
public class CustomNavigationRenderer : NavigationRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<NavigationPage> e)
    {
        base.OnElementChanged (e);

        var actionBar = ((Activity)Context).ActionBar;
        actionBar.SetIcon (Resource.Color.Transparent);
    }
}

要更改图标，只需更改项目文件:

To change icon, just change project files:

• YourProject/Resources/drawable/icon.png
• YourProject/Resources/drawable-hdpi/icon.png
• YourProject/Resources/drawable-xhdpi/icon.png
• YourProject/Resources/drawable-xxhdpi/icon.png

或在您的MasterDetailPage上将Icon属性设置为另一资源.

or on your MasterDetailPage set Icon property to another resource.

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