SwiftUI - Sign in with Apple crash on watchOS - watchkit

Question

I am implementing Sign in with Apple on watchOS using SwiftUI.
Since the WKInterfaceAuthorizationAppleIDButton doesn't conform to the View protocol I am wrapping it using WKInterfaceObjectRepresentable to use it in a SwiftUI view.
I have implemented a Coordinator to handle taps on the button and it also acts as a delegate for the Sign up process callbacks.
Below is my code:
struct AppleLoginButton: WKInterfaceObjectRepresentable {
typealias WKInterfaceObjectRepresentable = WKInterfaceObjectRepresentableContext<AppleLoginButton>
func updateWKInterfaceObject(_ wkInterfaceObject: WKInterfaceAuthorizationAppleIDButton, context: WKInterfaceObjectRepresentableContext<AppleLoginButton>) {
// No code required
}
class Coordinator: NSObject, ASAuthorizationControllerDelegate {
#objc func buttonPressed(_ sender: WKInterfaceAuthorizationAppleIDButton) {
let appleIDProvider = ASAuthorizationAppleIDProvider()
let request = appleIDProvider.createRequest()
request.requestedScopes = [.fullName, .email]
let authorizationController = ASAuthorizationController(authorizationRequests: [request])
authorizationController.delegate = self
authorizationController.performRequests()
}
func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
// Verify the user
}
}
func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
// Handle error.
}
}
func makeCoordinator() -> Coordinator {
return Coordinator()
}
func makeWKInterfaceObject(context: WKInterfaceObjectRepresentableContext<AppleLoginButton>) -> WKInterfaceAuthorizationAppleIDButton {
return WKInterfaceAuthorizationAppleIDButton(target: context.coordinator, action: #selector(Coordinator.buttonPressed(_:)))
}
}
Whenever I tap the Sign in button the App crashes with the following error every time,
Thread 1: EXC_BAD_ACCESS (code=1, address=0x74747572)
can anybody help me if something is wrong with my code or the way I have implemented the Coordinator ?
However the above code works on iOS in SwiftUI with ASAuthorizationAppleIDButton button
And further if I implement Sign in with Apple in WatchKit it works without any issues.
So it seems that I am missing some implementation detail, would love some help on this.
Update:
I googled for EXC errors and most answers point to illegal memory access as the culprit for these crashes.
Further googling for target-action crashes revealed that if the target is released from the memory pool it leads to crashes.
So can anyone help how can I keep the Coordinator in memory without it getting autoreleased ?

Answer 1

I filed a Feedback with Apple regarding this issue, and they replied with the following fix.
WKInterfaceAuthorizationAppleIDButton does not trigger the action with a sender parameter. The fix here is to stop specifying a sender parameter on buttonPressed. So:
#objc func buttonPressed(_ sender: WKInterfaceAuthorizationAppleIDButton)
becomes
#objc func buttonPressed()
Then line:
WKInterfaceAuthorizationAppleIDButton(target: context.coordinator, action: #selector(Coordinator.buttonPressed(_:)))
becomes
WKInterfaceAuthorizationAppleIDButton(target: context.coordinator, action: #selector(Coordinator.buttonPressed))
The above changes fixes my issue and I have tested the same on a real device.
Hope someone finds this useful.