iOS 13.0 UIMenu and UIAction for UIContextMenuConfiguration - ios

Question

I'm trying to use the new APIs introduced in iOS 13.0 Beta. I have downloaded Xcode 11.0 Beta 3 to be able to access these API.
Some of the code I found online does things like:
extension SingleViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
let configuration = UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { actions -> UIMenu<UIAction>? in
// Creating Save button
let save = UIAction(__title: "Save", image: UIImage(systemName: "tray.and.arrow.down.fill"), options: []) { action in
// Just showing some alert
self.showAlert(title: action.title)
}
// Creating Rotate button
let rotate = UIAction(__title: "Rotate", image: UIImage(systemName: "arrow.counterclockwise"), options: []) { action in
self.showAlert(title: action.title)
}
// Creating Delete button
let delete = UIAction(__title: "Delete", image: UIImage(systemName: "trash.fill"), options: .destructive) { action in
self.showAlert(title: action.title)
}
// Creating Edit, which will open Submenu
let edit = UIMenu<UIAction>.create(title: "Edit...", children: [rotate, delete])
// Creating main context menu
return UIMenu<UIAction>.create(title: "Menu", children: [save, edit])
}
return configuration
}
}
This seems fine but doesn't even compile in my Xcode. The errors I get are:
Cannot specialize non-generic type 'UIMenu' Replace '<UIAction>' with ''
on creating configuration constant.
Type of expression is ambiguous without more context
on creating save action.
and couple other similar errors.
I should also mention, I don't even have the constructors that are in this format:
UIAction(__title: "String", image: UIImage, options: Array)
UIMenu.create(...)
Why are these missing in Xcode-11 beta 3.0 ?

Answer 1

Well, it changed. It's a beta! And I would expect it to change again, but for now, in beta 3, the initializer for UIAction is
init(__title title: String, image: UIImage?, identifier: UIAction.Identifier?,
handler: #escaping UIActionHandler)
UIMenu is not generic, and its initializer is
init(__title title: String, image: UIImage?, identifier: UIMenu.Identifier?,
options: UIMenu.Options = [], children: [UIMenuElement])
So here's a rewrite of your code that does compile under beta 3:
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
let configuration = UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { actions -> UIMenu? in
let save = UIAction(__title: "Save", image: UIImage(systemName: "tray.and.arrow.down.fill"), identifier: nil) { action in
// whatever
}
let rotate = UIAction(__title: "Rotate", image: UIImage(systemName: "arrow.counterclockwise"), identifier: nil) { action in
// whatever
}
let delete = UIAction(__title: "Delete", image: UIImage(systemName: "trash.fill"), identifier: nil) { action in
// whatever
}
let edit = UIMenu(__title: "Edit", image: nil, identifier: nil, children:[rotate,delete])
return UIMenu(__title: "Menu", image: nil, identifier: nil, children:[save, edit])
}
return configuration
}

Answer 2

In Xcode 11.0 Beta 5, you can now write:
extension SingleViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
let configuration = UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { actions -> UIMenu? in
// Creating Save button
let save = UIAction(title: "Save", image: UIImage(systemName: "tray.and.arrow.down.fill")) { action in
// Just showing some alert
self.showAlert(title: action.title)
}
// Creating Rotate button
let rotate = UIAction(title: "Rotate", image: UIImage(systemName: "arrow.counterclockwise")) { action in
self.showAlert(title: action.title)
}
// Creating Delete button
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash.fill"), attributes: .destructive) { action in
self.showAlert(title: action.title)
}
// Creating Edit, which will open Submenu
let edit = UIMenu(title: "Edit...", children: [rotate, delete])
// Creating main context menu
return UIMenu(title: "Menu", children: [save, edit])
}
return configuration
}
}
The classes are no longer generic e.g. UIMenu instead of UIMenu<UIAction>.
Comprehensive Swift initializers let you drop optional params, which have reasonable default values e.g. image, attributes and identifier.
No more UIMenu<UIAction>.create(...) or UIAction(__title:...). They're all real initializers now, yay!

Answer 3

On swift 5, this works:
extension ViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
let configuration = UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { actions -> UIMenu? in
// Creating Save button
let save = UIAction(title: "Save", image: UIImage(systemName: "tray.and.arrow.down.fill")) { action in
// Just showing some alert
self.showAlert(title: action.title)
}
// Creating Rotate button
let rotate = UIAction(title: "Rotate", image: UIImage(systemName: "arrow.counterclockwise")) { action in
self.showAlert(title: action.title)
}
// Creating Delete button
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash.fill")) { action in
self.showAlert(title: action.title)
}
// Creating Edit, which will open Submenu
let edit = UIMenu(title: "Edit...", children: [rotate, delete])
// Creating main context menu
return UIMenu(title: "Menu", children: [save, edit])
}
return configuration
}
}