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| extension ViewController: UIDropInteractionDelegate { | |
| func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal { | |
| let location = session.location(in: self.view) | |
| let dropOperation: UIDropOperation? | |
| if session.canLoadObjects(ofClass: String.self) { | |
| if dropTextView.frame.contains(location) { | |
| dropOperation = .copy | |
| } else if dropImageView.frame.contains(location) { | |
| dropOperation = .forbidden | |
| } else { | |
| dropOperation = .cancel | |
| } | |
| } | |
| else if session.canLoadObjects(ofClass: UIImage.self) { | |
| if dropImageView.frame.contains(location) { | |
| dropOperation = .copy | |
| } else if dropTextView.frame.contains(location) { | |
| dropOperation = .forbidden | |
| } else { | |
| dropOperation = .cancel | |
| } | |
| } | |
| else { | |
| dropOperation = .cancel | |
| } | |
| return UIDropProposal(operation: dropOperation!) | |
| } | |
| func dropInteraction(_ interaction: UIDropInteraction, performDrop session: UIDropSession) { | |
| if session.canLoadObjects(ofClass: String.self) { | |
| session.loadObjects(ofClass: String.self) { (items) in | |
| let values = items as [String] | |
| self.dropTextView.text = values.last | |
| } | |
| } else if session.canLoadObjects(ofClass: UIImage.self) { | |
| session.loadObjects(ofClass: UIImage.self) { (items) in | |
| let images = items as! [UIImage] | |
| self.dropImageView.image = images.last | |
| } | |
| } | |
| } | |
| } |
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