如何在xamarin.forms中旋转页面

Question

应用中有一些页面，有些页面是纵向的，但有些页面是横向的。 如果使用Android原生代码，我可以做到这一点是这样的：

<activity 
     android:name=".activity1" 
     android:screenOrientation="landscape" /> 
    <activity 
     android:name=".activity2" 
     android:screenOrientation="portrait"/> 

但如何界定xamarin.forms不同的屏幕方向

Answer 1

就可以实现这使得一个依赖

将界面在主窗体项目：

namespace Example 
{ 
    public interface IOrientationHandler 
    { 
     void ForceLandscape(); 
     void ForcePortrait(); 
    } 
} 

这样称呼它：

DependencyService.Get<IOrientationHandler>().ForceLandscape(); 
DependencyService.Get<IOrientationHandler>().ForcePortrait(); 

的Android

[assembly: Xamarin.Forms.Dependency(typeof(OrientationHandler))] 
namespace Example 
{ 
    public class OrientationHandler : IOrientationHandler 
    { 
     public void ForceLandscape() 
     { 
      ((Activity)Forms.Context).RequestedOrientation = ScreenOrientation.Landscape; 
     } 

     public void ForcePortrait() 
     { 
      ((Activity)Forms.Context).RequestedOrientation = ScreenOrientation.Portrait; 
     } 
    } 
} 

的iOS

[assembly: Xamarin.Forms.Dependency(typeof(OrientationHandlerImplementation))] 
namespace Example 
{ 
    public class OrientationHandlerImplementation : IOrientationHandler 
    { 
     public void ForceLandscape() 
     { 
      UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.LandscapeLeft), new NSString("orientation")); 
     } 

     public void ForcePortrait() 
     { 
      UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.Portrait), new NSString("orientation")); 
     } 
    } 
}