raymondis raymondis - 4 months ago 37
iOS Question

How to select an Image from Gallery in Xamarin.ios

I want to load an Image from Gallery and display it on a

UIImageView
.

I tried to do it like in the sample in Xamarin Recipes, but all I get is null.

https://developer.xamarin.com/recipes/ios/media/video_and_photos/choose_a_photo_from_the_gallery/

My Code so far:

public partial class ViewController : UIViewController
{
UIImagePickerController imagePicker;
UIButton choosePhotoButton;
UIImageView imageView;

public ViewController(IntPtr handle) : base(handle)
{
}

public ViewController()
{
}

public override void ViewDidLoad()
{
base.ViewDidLoad();
Title = "Wähle Bild aus:";
View.BackgroundColor = UIColor.White;

imageView = new UIImageView(new CGRect(10, 150, 300, 300));
Add(imageView);

choosePhotoButton = UIButton.FromType(UIButtonType.RoundedRect);
choosePhotoButton.Frame = new CGRect(10, 80, 100, 40);
choosePhotoButton.SetTitle("Picker", UIControlState.Normal);
choosePhotoButton.TouchUpInside += (s, e) =>
{
imagePicker = new UIImagePickerController();

imagePicker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
imagePicker.MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.PhotoLibrary);

imagePicker.FinishedPickingMedia += Handle_FinishedPickingMedia;
imagePicker.Canceled += Handle_Canceled;

NavigationController.PresentModalViewController(imagePicker, true);

};

View.Add(choosePhotoButton);

}


private void Handle_Canceled(object sender, EventArgs e)
{
imagePicker.DismissModalViewController(true);
}

protected void Handle_FinishedPickingMedia(object sender, UIImagePickerMediaPickedEventArgs e)
{
bool isImage = false;
switch (e.Info[UIImagePickerController.MediaType].ToString())
{
case "public.image":
Console.WriteLine("Image selected");
isImage = true;
break;
case "public.video":
Console.WriteLine("Video selected");
break;
}

// get common info (shared between images and video)
NSUrl referenceURL = e.Info[new NSString("UIImagePickerControllerReferenceUrl")] as NSUrl;
if (referenceURL != null)
Console.WriteLine("Url:" + referenceURL.ToString());

// if it was an image, get the other image info
if (isImage)
{
// get the original image
UIImage originalImage = e.Info[UIImagePickerController.OriginalImage] as UIImage;
if (originalImage != null)
{
// do something with the image
imageView.Image = originalImage; // display
}

UIImage editedImage = e.Info[UIImagePickerController.EditedImage] as UIImage;
if (editedImage != null)
{
// do something with the image
Console.WriteLine("got the edited image");
imageView.Image = editedImage;
}
}

// dismiss the picker
imagePicker.DismissModalViewController(true);
}


I get null at this line:
NavigationController.PresentModalViewController(imagePicker, true);


What I'm doing wrong?

Thanks for any help!

Kind Regards,

Answer

Appears that you are not using a UINavigationController, so change:

NavigationController.PresentModalViewController(imagePicker, true);

To:

PresentModalViewController(imagePicker, true);

Note: PresentModalViewController is deprecated since ios6, so you can change your code to use:

PresentViewControllerAsync(imagePicker, true);

Or:

PresentViewController(imagePicker, true, () => {
});
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