I'm trying to implement a Help Window from Help Menu in macOS (Mac Catalyst). I have SceneConfiguration in Info.plist and multi-window enabled. Tapping Help menu opens a new Help Window on macOS. I thought it was working great!
Unfortunately, tapping Help menu again opens a new Help Window. I only want one Help window to be shown.
I expected UIApplication.shared.activateSceneSession(for: request) to use an existing UIScene if one was already present. In my experience I always get a new Scene and thus a new Window. What am I missing?
AppDelegate.swift
func application(_ application: UIApplication,
configurationForConnecting connectingSceneSession: UISceneSession,
options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// It's important that each UISceneConfiguration have a unique configuration name.
var configurationName: String!
switch options.userActivities.first?.activityType {
case UserActivity.HelpMenuActivityType:
configurationName = SceneConfiguration.helpWindowConfiguration
default:
configurationName = SceneConfiguration.defaultConfiguration
}
return UISceneConfiguration(name: configurationName, sessionRole: connectingSceneSession.role)
}
override func buildMenu(with builder: UIMenuBuilder) {
super.buildMenu(with: builder)
...
builder.remove(menu: .help)
builder.insertSibling(helpMenu(), afterMenu: .window)
}
func helpMenu() -> UIMenu {
let children: [UIAction] = [
UIAction(...
) { [weak self] action in
self?.helpMenuTappedHandler(action)
}
]
....
}
func helpMenuTappedHandler(_ action: UIAction) {
let userActivity: NSUserActivity = ...
userActivity.targetContentIdentifier = ...
let options: UIScene.ActivationRequestOptions = .init()
options.requestingScene = ...
let request: UISceneSessionActivationRequest = .init(role: .windowApplication, userActivity: userActivity, options: options)
UIApplication.shared.activateSceneSession(for: request, errorHandler: handleHelpError)
}
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