UIDropInteraction fails in simulator

Hey,

Drag and Drop works fine for me. Did you also implement the following method?

dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal

Dropping won't work if you don't tell the drag how dropping will be performed (and if it's even possible on that exact spot of your view).

Best,
Klemens

even implementing this for UTI type Data gives the same error in the iPad PRO simulator.

Also I noticed that this happened when there were a few views that could accept the drop then the drop will succeed if its the first view, but is the user lifts the mouse in simulator on the second or the third view then the drop would give this error

PBItemCollectionServicer connection disconnected.

I'm having the same issue in iOS 11 GM on a iPhone 7 Plus. The performDrop method isn't being called. 😢

I'm also implementing this method and the performDrop method isn't being called.

I can confirm that performDrop isn't being called in the iOS Simulator.

I'm implementing these 3 methods:

- (BOOL)dropInteraction:(UIDropInteraction *)interaction canHandleSession:(id<UIDropSession>)session API_AVAILABLE(ios(11.0))
{
  return ([session canLoadObjectsOfClass:UIImage.class]);
}

- (UIDropProposal *)dropInteraction:(UIDropInteraction *)interaction sessionDidUpdate:(id<UIDropSession>)session API_AVAILABLE(ios(11.0))
{
  return ([[UIDropProposal alloc] initWithDropOperation:UIDropOperationCopy]);
}

- (void)dropInteraction:(UIDropInteraction *)interaction performDrop:(id<UIDropSession>)session API_AVAILABLE(ios(11.0))
{
  CGPoint loc = [session locationInView:self.view];

  NSLog(@"%f, %f", loc.x, loc.y);
}

The dragged item shows the green +, but when dropping, the performDrop method isn't being called in the iOS Simulator (at the moment, I can't test on a real iPad).

Using Xcode Version 9.0.1 (9A1004).

Update:

Dropping into UIViews is working in the Simulator.

In my app, the performDrop method isn't being called in the iOS Simulator when:

- I'm dropping into a GLKView with an Open GL ES context. (when I do nothing in glkView: drawInRect:, performDrop is being called)

Problem solved in Xcode 9.1 Simulator!

Code Block 
tableView.dragInteractionEnabled = true
tableView.dragDelegate = self