func paste(itemProviders: [NSItemProvider]) { - swift

Question

I use the "drag" and "paste" functions of multiple imagesViews to multiple imageViews in the same application. As the function "drag" allows to know the imageView of origin, does the function "drop" makes it possible to know the imageView "target" at the end of the "drag" (coordinates? Tag? ...). Thank you for any suggestions.
// Right here, itemsForBeginning session: UIDragSession) allows to retrieve the imageView of origin.
func dragInteraction(_ interaction: UIDragInteraction, itemsForBeginning session: UIDragSession) -> [UIDragItem] {
let touchPoint = session.location(in: self.view)
print("\(touchPoint.x)")
print("\(touchPoint.y)")
//...
guard let image = viewTaped!.image else { return [] }
let item = UIDragItem(itemProvider: NSItemProvider(object: image))
return [item]
}
// But with the function "paste", Swift knows the target, but can I and how to recover the informations of imageView_yyy? (coordinates? Tag? ...).
override func paste(itemProviders: [NSItemProvider]) {
_ = itemProviders.first?.loadObject(ofClass: UIImage.self, completionHandler: { (image: NSItemProviderReading?, error: Error?) in
DispatchQueue.main.async {
self.imageView_yyy.image = image as? UIImage
}
})
}

Answer 1

You need to retain the loading callback. By assigning it to _ you are telling Swift that it's trash that can be discarded immediately
// This retains the progress
var pasteProgress: Progress?
override func paste(itemProviders: [NSItemProvider]) {
pasteProgress = itemProviders.first?.loadObject(ofClass: UIImage.self, completionHandler: { (image: NSItemProviderReading?, error: Error?) in
DispatchQueue.main.async {
self.imageView_yyy.image = image as? UIImage
}
})
}