如何在xamarin.forms中旋轉頁面

Question

應用中有一些頁面，有些頁面是縱向的，但有些頁面是橫向的。 如果使用Android原生代碼，我可以做到這一點是這樣的：

<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

就可以實現這使得一個依賴

將界面在主窗體項目：

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

這樣稱呼它：

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")); 
     } 
    } 
}