使用相机

Question

我正在尝试实现类似Snapchat的功能，其中用户通过向左或向右滑动来浏览视图。我正在使用UIPageViewController。

当我滑到UIImagePickerController视图时出现问题。当用户滑动到该视图上时，相机会正确显示，但是当用户放开屏幕并且视图锁定到位时，相机几乎完全模糊，就像对其施加雾层一样，然后重新聚焦回正常。 / p>

奇怪的是，如果过渡样式是“Page Curl”，则不会发生这种情况。它只发生在“滚动”上。

如何阻止此行为？

4在故事板中查看控制器 - Master，PageView，Home和Create（主代码和创建代码）

感谢。

HeroMasterViewController类：

partial class HeroMasterViewController : ViewControllerBase IUIPageViewControllerDataSource
{
    private UIViewController[] _heroViewControllers;

    private UIPageViewController _heroPageViewController;

    public HeroMasterViewController (IntPtr handle) : base (handle, Navigation.Page.HeroMaster)
    {
    }

    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();

        _heroPageViewController = this.Storyboard.InstantiateViewController ("HeroPageViewController") as UIPageViewController;

        _heroPageViewController.DataSource = this;

        InitViewControllers ();

        var startingViewController = new UIViewController[1] { _heroViewControllers [0] };

        _heroPageViewController.SetViewControllers (startingViewController, UIPageViewControllerNavigationDirection.Forward, true, null);

        _heroPageViewController.View.Frame = new CoreGraphics.CGRect (0, 0, this.View.Frame.Width, this.View.Frame.Size.Height);

        this.AddChildViewController (_heroPageViewController);

        this.View.AddSubview(_heroPageViewController.View);

        _heroPageViewController.DidMoveToParentViewController(this);
    }

    public void InitViewControllers()
    {
        _heroViewControllers = new UIViewController[2];

        _heroViewControllers [0] = this.Storyboard.InstantiateViewController ("HomeViewController");

        _heroViewControllers [1] = this.Storyboard.InstantiateViewController ("CreateViewController");
    }


    public UIViewController GetPreviousViewController (UIPageViewController pageViewController, UIViewController referenceViewController)
    {
        var controller = referenceViewController as HeroViewControllerBase;

        if (controller.Index == 0)
            return null;

        return _heroViewControllers[controller.Index - 1];
    }

    public UIViewController GetNextViewController (UIPageViewController pageViewController, UIViewController referenceViewController)
    {
        var controller = referenceViewController as HeroViewControllerBase;

        if (controller.Index == (_heroViewControllers.Length - 1))
            return null;

        return _heroViewControllers[controller.Index + 1];
    }
}

CreateViewController类：

partial class CreateViewController : HeroViewControllerBase
{
    private Xamarin.Media.MediaPicker Picker;
    private MediaPickerController MediaController;


    public CreateViewController (IntPtr handle) : base (handle, Navigation.Page.HeroCreate, 1)
    {
        this.Picker = new Xamarin.Media.MediaPicker();

    }

    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();

        DisplayPicker ();
    }

    private void DisplayPicker()
    {
        if (this.MediaController != null)
            return;

        this.MediaController = this.Picker.GetTakePhotoUI(new StoreCameraMediaOptions
            {
                Name = DateTime.Now.ToFileTimeUtc() + ".jpg",
                Directory = "MediaPickerSample"
            });

        this.MediaController.AllowsEditing = false;
        this.MediaController.ShowsCameraControls = false;
        this.MediaController.AllowsImageEditing = false;

        this.MediaController.CameraDevice = UIImagePickerControllerCameraDevice.Front;


        this.MediaController.View.Frame = new CGRect (0, 0, this.View.Frame.Width, this.View.Frame.Height);
    var translate = CGAffineTransform.MakeTranslation (0, 71.0f);

        this.View.AddSubview(this.MediaController.View);

    }
}