c# - Xamarin - MediaPicker 不显示适用于 iOS 的 videoPicker

Question

我尝试在我正在编写的主应用程序中执行此操作，但似乎无法使其正常工作。所以我创建了一个单 View 应用程序来尝试并找出它，但我似乎仍然被卡住了。他就是我得到的。

public partial class HelloViewController : UIViewController
{
    partial class VideoPickerController : UIViewController
    {
        MediaPicker videoPicker;
        readonly TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();
        public VideoPickerController (IntPtr handle) : base (handle)
        {
        }

        public override void DidReceiveMemoryWarning ()
        {
            // Releases the view if it doesn't have a superview.
            base.DidReceiveMemoryWarning ();

            // Release any cached data, images, etc that aren't in use.
        }

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

            var picker = new MediaPicker ();

            PresentViewController (picker.GetPickPhotoUI (), true, null);


        }
    }
}

基本上我得到的只是一个白屏，没有任何反应。谢谢!

Answer 1

我认为您不需要手动呈现它。这是我使用的代码，它会自动为我呈现 UI。这段代码不在它自己的 View Controller 中，它只是在我有按钮拍照的任何 View Controller 中。相册和拍视频也有类似的方法。

Here是指向我托管此示例应用程序的 github 页面的链接。

var picker = new Xamarin.Media.MediaPicker();

btnCamera.Hidden = !picker.IsCameraAvailable;
btnCamera.TouchUpInside += async (sender, e) =>
{
    try
    {
        MediaFile file = 
            await picker.TakePhotoAsync(new StoreCameraMediaOptions());
        processImage(file);
    }
    catch { }
};

btnPhoto.Hidden = !picker.PhotosSupported;
btnPhoto.TouchUpInside += async (sender, e) =>
{
    try
    {
        MediaFile file = await picker.PickPhotoAsync();
        processImage(file);
    }
    catch { }
};

private void processImage(MediaFile file)
{
    if (file != null)
    {
        viewModel.Image = file.GetStream();
        viewModel.ImagePath = file.Path;
        setImage();
    }
}

private void setImage()
{
    try
    {
        System.Diagnostics.Debug.WriteLine(viewModel.ImagePath);
        if (!string.IsNullOrEmpty(viewModel.ImagePath) &&
            System.IO.File.Exists(viewModel.ImagePath))
        {
            imgImage.Image = new UIImage(NSData.FromFile(viewModel.ImagePath));
        }
        else if (viewModel.Image != null && viewModel.Image.Length != 0)
        {
            imgImage.Image = new UIImage(NSData.FromStream(viewModel.Image));
        }
    }
    //just don't load image
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }
}