Hi,
Thank you for the response. Yes, i understand it no need to add any custom actions, based on
accessibilityDragSourceDescriptors property its adding the actions.
Got one more challenge as how we can add Drag featues for more than 1 object for session.
This
UIDragInteractionDelegate is assign to single object only at a time. In my application we have multiple objects in a view, for all those objects need to add
UIDragInteraction,help me how to achieve this.
Without accessibility, if we add UIDragInteraction for ViewObject(contains our over all drag objects) it's working fine.
With Accessibility, for which uiobject we add UIDragInteractionDelegate only for that particular object voice over adding the custom actions.
CodeSample - Without Accessibility
Code Block | override func viewDidLoad() { |
| super.viewDidLoad() |
| let dragInt = UIDragInteraction.init(delegate: self) |
| dragInt.isEnabled = true |
| dragView.addInteraction(dragInt) //added Drag interaction |
| dragView.addInteraction(UIDropInteraction.init(delegate: self)) //added Drop interaction |
| } |
|
| func dragInteraction(_ interaction: UIDragInteraction, itemsForBeginning session: UIDragSession) -> [UIDragItem] { |
| |
| let touchpoint = session.location(in: self.dragView) |
| if let touimgview = self.view.hitTest(touchpoint, with: nil) as? UIImageView { |
| |
| let touchedimage = touimgview.image |
| |
| let itemProvider = NSItemProvider(object: touchedimage!) |
| let dragItem = UIDragItem(itemProvider: itemProvider) |
| dragItem.localObject = touimgview |
| return [dragItem] |
| } |
| |
| return [] |
| } |
| |
| func dragInteraction(_ interaction: UIDragInteraction, previewForLifting item: UIDragItem, session: UIDragSession) -> UITargetedDragPreview? { |
| return UITargetedDragPreview(view: item.localObject as! UIView) |
| } |
|
| func dropInteraction(_ interaction: UIDropInteraction, performDrop session: UIDropSession) { |
| for dragItem in session.items { |
| dragItem.itemProvider.loadObject(ofClass: UIImage.self, completionHandler: { (obj, err) in |
| |
| if let err = err { |
| print("Failed to load our dragged item:", err) |
| return |
| } |
| |
| |
| guard let draggedImage = obj as? UIImage else { return } |
| |
| |
| |
| DispatchQueue.main.async { |
| let dragItemis = dragItem.localObject as! UIImageView |
| let touchpoint = session.location(in: self.dragView) |
| if self.dropimgeViewObject.frame.contains(touchpoint) { |
| self.dropimgeViewObject.image = draggedImage |
| } |
| } |
| }) |
| } |
| } |
| func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal { |
| return UIDropProposal(operation: .copy) |
| } |
| |
| func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool { |
| return session.canLoadObjects(ofClass: UIImage.self) |
| } |
| |
Above code is working fine.
Code Sample - With Accessibility
Code Block | @IBOutlet weak var img1 : UIImageView! |
| @IBOutlet weak var img2 : UIImageView! |
| @IBOutlet weak var img3 : UIImageView! |
|
| @IBOutlet weak var viweofDrag : UIView! |
|
| override func viewDidLoad() { |
| super.viewDidLoad() |
|
| let dragInteloc2 = UIAccessibilityLocationDescriptor(name: "Drag Object", point: img1.center, in: self.img1) |
| self.img1.accessibilityDragSourceDescriptors = [dragInteloc2] |
| self.img1.accessibilityLabel = "Drag Circle" |
|
| let dragInteloc3 = UIAccessibilityLocationDescriptor(name: "Drag Object", point: img2.center, in: self.img2) |
| self.img2.accessibilityDragSourceDescriptors = [dragInteloc3] |
| self.img2.accessibilityLabel = "Drag Circle" |
| |
| let dragint = UIDragInteraction(delegate: self) |
| dragint.isEnabled = true |
| self.img1.addInteraction(dragint) //only img1 viewobject only have action items for Voice over |
| self.img2.addInteraction(dragint) //how to achieve this, not working |
|
|
|
| let dropinte = UIDropInteraction(delegate: self) |
| self.img2.addInteraction(dropinte) |
| |
| let dropinte2 = UIDropInteraction(delegate: self) |
| self.img3.addInteraction(dropinte2) |
| } |
|
| func dragInteraction(_ interaction: UIDragInteraction, itemsForBeginning session: UIDragSession) -> [UIDragItem] { |
| |
| guard let image = img1.image else { |
| return [] |
| } |
| let irem = UIDragItem(itemProvider: NSItemProvider(object: image)) |
| irem.localObject = image |
| return [irem] |
| } |
| |
| func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool { |
| return true |
| } |
| |
| func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal { |
| let droploc = session.location(in: self.viweofDrag) |
| let operat : UIDropOperation |
| if img2.frame.contains(droploc) || img3.frame.contains(droploc) { |
| operat = session.localDragSession == nil ? .copy : .move |
| } |
| else{ |
| operat = .cancel |
| } |
| return UIDropProposal(operation: operat) |
| } |
| |
| func dropInteraction(_ interaction: UIDropInteraction, sessionDidEnd session: UIDropSession) { |
| let droploc = session.location(in: self.viweofDrag) |
| self.updateLayes(droploc: droploc) |
| } |
| |
| func dropInteraction(_ interaction: UIDropInteraction, sessionDidExit session: UIDropSession) { |
| let droploc = session.location(in: self.viweofDrag) |
| self.updateLayes(droploc: droploc) |
| } |
|
| |
| func updateLayes(droploc : CGPoint) { |
| if img2.frame.contains(droploc) { |
| img2.image = UIImage.init(named: "1") |
| img1.image = UIImage.init(named: "2") |
| self.img1.accessibilityLabel = "Drag Square" |
|
| } |
| else if img3.frame.contains(droploc){ |
| img3.image = UIImage.init(named: "2") |
| img1.image = nil |
| } |
| |
| } |
|
|
Help me to solve this issue.
Thank you
