iOS AlertView App Extension - ios

Question

I'm working in a custom keyboard (iOS App Extension). I have a UICollectionView in my Keyboard Layout, so when one item is selected I want to show a message (UIAlerView for example).
Here is my code:
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
...
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:#"My Title"
message:#"Enter User Credentials"
preferredStyle:UIAlertControllerStyleAlert];
[self presentViewController:alert animated:YES completion:nil];
}
I get this error: 'Feature not available in extensions of type com.apple.keyboard-service'
So...is there any way to show a message from an App Extension?
EDIT:
Here is an example. The IKEA Emoticons Keyboard shows a message (like an Android Toast after selecting one item).
I also have tried this library:
iOS Toast Library

Answer 1

Sad to say that, but there's no way to show a UIAlertView in keyboard extension. Actually, nothing above the frame of InputViewController can be showed. It's pretty clear in the Apple's doc:
...a custom keyboard can draw only within the primary view of its UIInputViewController object... it is not possible to display key artwork above the top edge of a custom keyboard’s primary view, as the system keyboard does on iPhone when you tap and hold a key in the top row.
As for message inside the keyboard, there are some useful libraries that can help us with it. For example https://github.com/scalessec/Toast and https://github.com/sergeylenkov/PTHintController.

Answer 2

Finally I solved the problem. It's not the best solution, but at least I get the effect that I wanted.
I've created a View simulating a Toast in the xib file and set it to hidden.
When the item is selected, I show the "faked" Toast for 2 seconds and hide it again.
self.popUpView.hidden = NO;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 2.0 * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
self.popUpView.hidden = YES;
});
I don't know if it's a good solution, but I really had to find a solution for that.
For Swift you can use this :
self.popUpView.isHidden = false
DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
self.popUpView.isHidden = true
}