public Task <PickedFileModel> GetFileAsync()
{
// Find the root view controller.
var viewController = UIApplication.SharedApplication.KeyWindow.RootViewController;
// Create the task completion source.
var taskCompletionSource = new TaskCompletionSource <PickedFileModel>();
// Create the image picker.
var imagePicker = new UIImagePickerController
{
SourceType = UIImagePickerControllerSourceType.PhotoLibrary,
MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.PhotoLibrary)
};
// Register event handlers.
imagePicker.FinishedPickingMedia += (sender, e) =>
{
// Extract the file name.
var referenceUrl = e.Info.Values[1] as NSUrl;
var assetsLibrary = new AssetsLibrary.ALAssetsLibrary();
assetsLibrary.AssetForUrl(referenceUrl, obj =>
{
// Get the file stream.
var stream = (e.EditedImage ?? e.OriginalImage).AsPNG().AsStream();
// Complete the task.
taskCompletionSource.SetResult(new PickedFileModel
{
Name = obj.DefaultRepresentation.Filename,
Stream = stream
});
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
}, obj =>
{
taskCompletionSource.SetResult(null);
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
});
};
imagePicker.Canceled += (sender, e) =>
{
taskCompletionSource.SetResult(null);
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
};
// Show the image picker.
viewController.PresentModalViewController(imagePicker, true);
return(taskCompletionSource.Task);
}
public Task <string> GetFileStringAsync()
{
var taskCompletionSource = new TaskCompletionSource <string>();
// Create the image picker.
var imagePicker = new UIImagePickerController();
imagePicker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
imagePicker.MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.PhotoLibrary);
// Register event handlers.
imagePicker.FinishedPickingMedia += (sender, e) =>
{
// Extract the file name.
var referenceUrl = e.Info.Values.FirstOrDefault(v => v is NSUrl) as NSUrl;
var assetsLibrary = new AssetsLibrary.ALAssetsLibrary();
assetsLibrary.AssetForUrl(referenceUrl, (obj) =>
{
// Get the file stream.
var stream = (e.EditedImage ?? e.OriginalImage).AsPNG().AsStream();
var bytes = stream.GetBytes();
var str = Convert.ToBase64String(bytes);
// Complete the task.
taskCompletionSource.SetResult(str);
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
}, (obj) =>
{
taskCompletionSource.SetResult(null);
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
});
};
imagePicker.Canceled += (sender, e) =>
{
taskCompletionSource.SetResult(null);
// Dismiss the image picker.
imagePicker.DismissViewController(true, null);
};
// Show the image picker.
var window = UIApplication.SharedApplication.KeyWindow;
var viewController = window.RootViewController;
viewController.PresentViewController(imagePicker, true, null);
return(taskCompletionSource.Task);
}