方向锁在xamarin ios中不起作用

我必须将单个viewcontroller锁定为横向，其他viewcontroller全部旋转。我已经尝试了下面的代码。但视图方向不随景观而改变。请给出你的建议

AppDelegate.cs

public bool RestrictRotation
{
   get;
   set;
}

[Export("application:supportedInterfaceOrientationsForWindow:")]
public UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, IntPtr
    forWindow)
{
    if (this.RestrictRotation)
        return UIInterfaceOrientationMask.Landscape;
    else
        return UIInterfaceOrientationMask.All;
}

Viewcontroller.cs

public override void ViewDidLoad()
{
    base.ViewDidLoad();
    this.RestrictRotation(true);
    // Perform any additional setup after loading the view, typically from a nib.
}

public override bool ShouldAutorotate()
{
    return false;
}

public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations()
{
    return UIInterfaceOrientationMask.Landscape;
}

public override UIInterfaceOrientation PreferredInterfaceOrientationForPresentation()
{
    return UIInterfaceOrientation.LandscapeLeft;
}

void RestrictRotation(bool restriction)
{
    AppDelegate app = (AppDelegate)UIApplication.SharedApplication.Delegate;
    app.RestrictRotation = restriction;
}

---

您可以在ViewController中添加以下代码

public override void ViewWillAppear(bool animated)
{
   base.ViewWillAppear(animated);

   AppDelegate appDelegate = (AppDelegate)UIApplication.SharedApplication.Delegate;
   appDelegate.allowRotation = true;

   UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.LandscapeLeft), new NSString("orientation"));
}

public override void ViewWillDisappear(bool animated)
{
   base.ViewWillDisappear(animated);

   AppDelegate appDelegate = (AppDelegate)UIApplication.SharedApplication.Delegate;
   appDelegate.allowRotation = false;

   UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.Unknown), new NSString("orientation"));
}

此外，不要忘记检查info.plist中的要求全屏，否则它在某些全屏设备（如iPad Pro）上无法工作

---

appDelegare中没有“allowRotation”属性。请使用

RestrictRotation

。不，viewcontroller仍然没有旋转。它在我这边工作正常，您可以共享您的示例，我将在我这边测试。请从链接中查找示例附件。