如何在Xamarin.Forms中设置ContentPage方向 [英] How to set ContentPage orientation in Xamarin.Forms

问题描述

我正在使用Xamarin.Forms创建跨平台应用程序，我的所有ContentPages都位于PCL中.

I'm using Xamarin.Forms to create a cross platform application, all of my ContentPages are situated within the PCL.

我正在寻找一种将单个ContentPage的orientation设置并锁定为Landscape的方法，最好不必在每个平台特定项目中创建另一个活动.

I'm looking for a way to set and lock the orientation of a single ContentPage to Landscape, preferably without having to create another activity in each of the platform specific projects.

由于我的ContentPage.Content设置为ScrollView，因此我尝试将ScrollOrientation设置为Horizontal，但是这不起作用.

Since my ContentPage.Content is set to a ScrollView, I've tried setting the ScrollOrientation to Horizontal, however this did not work.

我也尝试过使用RelativeLayout，但在此上看不到Orientation属性.

I've also tried using a RelativeLayout, but I can't see an Orientation property on this.

public class PlanningBoardView : ContentPage //Container Class.
    {
        public PlanningBoardView()
        {
            scroller = new ScrollView ();

            Board = new PlanningBoard();

            scroller.Orientation = ScrollOrientation.Horizontal;
            scroller.WidthRequest = Board.BoardWidth;
            scroller.Content = Board;

            Content = scroller;
        }
    }

我最后尝试使用的是Xamarin Studio的Intellisense版本和 Xamarin Forms API Doc 查看可供我使用的不同布局，而这些布局都没有Orientation属性.

The last thing I tried was using Xamarin Studio's version of Intellisense and the Xamarin Forms API Doc's to look through the different Layouts available to me, none of which had a Orientation property.

我担心这样做的唯一方法是为该ContentPage创建第二个特定于平台的Activity并将方向设置为横向.

I fear the only way to do this is by creating a second platform specific Activity just for this one ContentPage and setting the orientation to landscape.

尽管此方法可行，但它使屏幕之间的导航更加复杂.

Although this method would work, it makes the Navigation between screens a lot more complex.

目前正在Android上对其进行测试.

This is currently being tested in Android.

推荐答案

讨厌这么说，但这只能使用

Hate to say this but this can only be done using custom renderers or a platform-specific code

在android中，您可以设置 RequestedOrientation 将MainActivity的>属性设置为ScreenOrientation.Landscape.

In android, you can set the RequestedOrientation property of the MainActivity to ScreenOrientation.Landscape.

在iOS中，如果Xamarin.Forms.Application.Current.MainPage是要插入的ContentPage，则可以覆盖AppDelegate类中的GetSupportedInterfaceOrientations以返回UIInterfaceOrientationMask值之一.

In iOS, you can override GetSupportedInterfaceOrientations in the AppDelegate class to return one of the UIInterfaceOrientationMask values when Xamarin.Forms.Application.Current.MainPage is the ContentPage that you are intereted in.

Android

[assembly: Xamarin.Forms.ExportRenderer(typeof(MyCustomContentPage), typeof(CustomContentPageRenderer))]

public class CustomContentPageRenderer : Xamarin.Forms.Platform.Android.PageRenderer
{
    private ScreenOrientation _previousOrientation = ScreenOrientation.Unspecified;

    protected override void OnWindowVisibilityChanged(ViewStates visibility)
    {
        base.OnWindowVisibilityChanged(visibility);

        var activity = (Activity)Context;

        if (visibility == ViewStates.Gone)
        {
            // Revert to previous orientation
            activity.RequestedOrientation = _previousOrientation == ScreenOrientation.Unspecified ? ScreenOrientation.Portrait : _previousOrientation;
        }
        else if (visibility == ViewStates.Visible)
        {
            if (_previousOrientation == ScreenOrientation.Unspecified)
            {
                _previousOrientation = activity.RequestedOrientation;
            }

            activity.RequestedOrientation = ScreenOrientation.Landscape;
        }
    }
}

iOS

public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
    public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, UIWindow forWindow)
    {
        if (Xamarin.Forms.Application.Current == null || Xamarin.Forms.Application.Current.MainPage == null)
        {
            return UIInterfaceOrientationMask.Portrait;
        }

        var mainPage = Xamarin.Forms.Application.Current.MainPage;

        if (mainPage is MyCustomContentPage ||
           (mainPage is NavigationPage && ((NavigationPage)mainPage).CurrentPage is MyCustomContentPage) ||
           (mainPage.Navigation != null && mainPage.Navigation.ModalStack.LastOrDefault() is MyCustomContentPage))
        {
            return UIInterfaceOrientationMask.Landscape;
        }

        return UIInterfaceOrientationMask.Portrait;
    }
}

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