public override void WillDisplayAssetItem(ImagePickerController controller, ImagePickerAssetCell cell,
PHAsset asset)
{
switch (cell)
{
case var _ when cell is CustomVideoCell videoCell:
videoCell.Label.Text = GetDurationFormatter().StringFromTimeInterval(asset.Duration);
break;
case var _ when cell is CustomImageCell imageCell:
switch (asset.MediaSubtypes)
{
case PHAssetMediaSubtype.PhotoLive:
imageCell.SubtypeImage.Image = UIImage.FromBundle("icon-live");
break;
case PHAssetMediaSubtype.PhotoPanorama:
imageCell.SubtypeImage.Image = UIImage.FromBundle("icon-pano");
break;
default:
{
if (UIDevice.CurrentDevice.CheckSystemVersion(10, 2) &&
asset.MediaSubtypes == PHAssetMediaSubtype.PhotoDepthEffect)
{
imageCell.SubtypeImage.Image = UIImage.FromBundle("icon-depth");
}
break;
}
}
break;
}
}
private void PresentPickerModally(ImagePickerController vc)
{
_openedAsInputView = false;
vc.NavigationItem.LeftBarButtonItem =
new UIBarButtonItem("Dismiss", UIBarButtonItemStyle.Done, DismissPresentedImagePicker);
var nc = new UINavigationController(vc);
PresentViewController(nc, true, null);
}
private void PresentPickerAsInputView(ImagePickerController vc)
{
//if you want to present view as input view, you have to set flexible height
//to adopt natural keyboard height or just set an layout constraint height
//for specific height.
vc.View.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
_currentInputView = vc.View;
_openedAsInputView = true;
ReloadInputViews();
}
private void PresentButtonTapped(object sender, EventArgs e)
{
_presentButton.Selected = !_presentButton.Selected;
if (!_presentButton.Selected)
{
UpdateNavigationItem(0);
_imagePicker.Release();
_currentInputView = null;
ReloadInputViews();
return;
}
_imagePicker = _imagePickerConfigurationHandlerClass.CreateImagePicker();
_imagePickerController = new ImagePickerControllerDelegate()
{
DidSelectActionItemAction = DidSelectActionItemAt,
DidDeselectAssetAction = UpdateSelectedItems,
DidSelectAssetAction = UpdateSelectedItems
};
_imagePicker.Delegate = _imagePickerController;
_imagePicker.DataSource = _imagePickerControllerDataSource;
// presentation
// before we present VC we can ask for authorization to photo library,
// if we don't do it now, Image Picker will ask for it automatically
// after it's presented.
PHPhotoLibrary.RequestAuthorization(handler =>
{
DispatchQueue.MainQueue.DispatchAsync(() =>
{
// we can present VC regardless of status because we support
// non granted states in Image Picker. Please check `ImagePickerControllerDataSource`
// for more info.
if (_imagePickerConfigurationHandlerClass.PresentsModally)
{
_imagePicker.LayoutConfiguration.ScrollDirection = UICollectionViewScrollDirection.Vertical;
PresentPickerModally(_imagePicker);
}
else
{
_imagePicker.LayoutConfiguration.ScrollDirection =
UICollectionViewScrollDirection.Horizontal;
PresentPickerAsInputView(_imagePicker);
}
});
});
}
public override void WillDisplayActionItem(ImagePickerController controller, UICollectionViewCell cell,
int index)
{
if (cell is IconWithTextCell iconWithTextCell)
{
iconWithTextCell.TitleLabel.TextColor = UIColor.Black;
switch (index)
{
case 0:
iconWithTextCell.TitleLabel.Text = "Camera";
iconWithTextCell.ImageView.Image = UIImageExtensions.FromBundle(BundleAssets.ButtonCamera);
break;
case 1:
iconWithTextCell.TitleLabel.Text = "Photos";
iconWithTextCell.ImageView.Image =
UIImageExtensions.FromBundle(BundleAssets.ButtonPhotoLibrary);
break;
}
}
}
public override void DidDeselectAsset(ImagePickerController controller, PHAsset asset)
{
DidDeselectAssetAction?.Invoke(controller.SelectedAssets);
}
public override void DidSelectActionItemAt(ImagePickerController controller, int index)
{
DidSelectActionItemAction?.Invoke(index);
}
/// <summary>
/// Called right before an asset item collection view cell is displayed. Use this method
/// to configure your cell based on asset media type, subtype, etc.
/// </summary>
/// <param name="controller">Controller.</param>
/// <param name="cell">Cell.</param>
/// <param name="asset">Asset.</param>
public virtual void WillDisplayAssetItem(ImagePickerController controller, ImagePickerAssetCell cell,
PHAsset asset)
{
}
/// <summary>
/// Called right before an action item collection view cell is displayed. Use this method
/// to configure your cell.
/// </summary>
/// <param name="controller">Controller.</param>
/// <param name="cell">Cell.</param>
/// <param name="index">Index.</param>
public virtual void WillDisplayActionItem(ImagePickerController controller, UICollectionViewCell cell,
int index)
{
}
/// <summary>
/// Called when user unselect previously selected asset.
/// </summary>
/// <param name="controller">Controller.</param>
/// <param name="asset">Asset.</param>
public virtual void DidDeselectAsset(ImagePickerController controller, PHAsset asset)
{
}
/// <summary>
/// Called when user taps on an action item, index is either 0 or 1 depending which was tapped
/// </summary>
/// <param name="controller">Controller.</param>
/// <param name="index">Index.</param>
public virtual void DidSelectActionItemAt(ImagePickerController controller, int index)
{
}