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userDefaults, garbage button, dragItem.localObject = indexPath
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // | ||
| // GarbageView.swift | ||
| // ImageGallery | ||
| // | ||
| // Created by Tatiana Kornilova on 15/06/2018. | ||
| // Copyright © 2018 Stanford University. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
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| class GarbageView: UIView, UIDropInteractionDelegate { | ||
|
|
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| // MARK: - Initialization | ||
|
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| override init(frame: CGRect) { | ||
| super.init(frame: frame) | ||
| setup() | ||
| } | ||
|
|
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| required init?(coder aDecoder: NSCoder) { | ||
| super.init(coder: aDecoder) | ||
| setup() | ||
| } | ||
|
|
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| var garbageViewDidChanged: (() -> Void)? | ||
|
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| private func setup() { | ||
| let dropInteraction = UIDropInteraction(delegate: self) | ||
| addInteraction(dropInteraction) | ||
|
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| backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0) | ||
|
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| let trashImage = UIImage.imageFromSystemBarButton(.trash) | ||
| let myButton = UIButton() | ||
| myButton.setImage(trashImage, for: .normal) | ||
| self.addSubview(myButton) | ||
| } | ||
|
|
||
| override func layoutSubviews() { | ||
| super.layoutSubviews() | ||
| if self.subviews.count > 0 { | ||
| self.subviews[0].frame = CGRect(x: bounds.width - bounds.height, | ||
| y: 0, | ||
| width: bounds.height, | ||
| height: bounds.height) | ||
| } | ||
| } | ||
|
|
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| // MARK: - UIDropInteractionDelegate | ||
|
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| func dropInteraction(_ interaction: UIDropInteraction, | ||
| canHandle session: UIDropSession) -> Bool { | ||
| return session.canLoadObjects(ofClass: UIImage.self) | ||
| } | ||
|
|
||
| func dropInteraction(_ interaction: UIDropInteraction, | ||
| sessionDidUpdate session: UIDropSession) -> UIDropProposal { | ||
| if session.localDragSession != nil { | ||
| return UIDropProposal(operation: .copy) | ||
| } else { | ||
| return UIDropProposal(operation: .forbidden) | ||
| } | ||
| } | ||
|
|
||
| func dropInteraction(_ interaction: UIDropInteraction, | ||
| previewForDropping item: UIDragItem, | ||
| withDefault defaultPreview: UITargetedDragPreview | ||
| ) -> UITargetedDragPreview? { | ||
|
|
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| let target = UIDragPreviewTarget( | ||
| container: self, | ||
| center: CGPoint(x: bounds.width - bounds.size.height * 1 / 2, | ||
| y: bounds.size.height * 1 / 2), | ||
| transform: CGAffineTransform(scaleX: 0.1, y: 0.1) | ||
| ) | ||
| return defaultPreview.retargetedPreview(with: target) | ||
| } | ||
|
|
||
| func dropInteraction(_ interaction: UIDropInteraction, | ||
| performDrop session: UIDropSession) { | ||
| session.loadObjects(ofClass: UIImage.self) { providers in | ||
| if let collection = (session.localDragSession?.localContext as? | ||
| UICollectionView), | ||
| let images = (collection.dataSource as? ImageGalleryCollectionViewController)?.imageGallery.images, | ||
| let items = session.localDragSession?.items { | ||
|
|
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| var indexPaths = [IndexPath] () | ||
| var indexes = [Int]() | ||
|
|
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| for item in items { | ||
| if let indexPath = item.localObject as? IndexPath { | ||
| let index = indexPath.item | ||
| indexes += [index] | ||
| indexPaths += [indexPath] | ||
| } | ||
| } | ||
| collection.performBatchUpdates({ | ||
| collection.deleteItems(at: indexPaths) | ||
| (collection.dataSource as? ImageGalleryCollectionViewController)?.imageGallery.images | ||
| = images | ||
| .enumerated() | ||
| .filter { !indexes.contains($0.offset) } | ||
| .map { $0.element } | ||
| }) | ||
| self.garbageViewDidChanged?() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| extension UIImage{ | ||
|
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| class func imageFromSystemBarButton(_ systemItem: UIBarButtonItem.SystemItem, | ||
| renderingMode:UIImage.RenderingMode = .automatic)-> UIImage { | ||
|
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| let tempItem = UIBarButtonItem(barButtonSystemItem: systemItem, | ||
| target: nil, action: nil) | ||
|
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| // add to toolbar and render it | ||
| let bar = UIToolbar() | ||
| bar.setItems([tempItem], animated: false) | ||
| bar.snapshotView(afterScreenUpdates: true) | ||
|
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| // got image from real uibutton | ||
| let itemView = tempItem.value(forKey: "view") as! UIView | ||
|
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| for view in itemView.subviews { | ||
| if view is UIButton { | ||
| let button = view as! UIButton | ||
| let image = button.imageView!.image! | ||
| image.withRenderingMode(renderingMode) | ||
| return image | ||
| } | ||
| } | ||
|
|
||
| return UIImage() | ||
| } | ||
| } |
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