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我試圖建立一個PKPushRegistry，所以我可以接收VOIP服務推送但我的代表沒有開火。我成功找回了一個設備，所以我知道這個過程的第一部分工作。另外，我的服務器擁有適合這兩種推送的證書。Voip服務（PKPush）委託方法不被調用
class AppDelegate: UIResponder, UIApplicationDelegate, PKPushRegistryDelegate {
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
self.voipRegistration()
}
func voipRegistration() {
let mainQueue = DispatchQueue.main
let voipRegistry: PKPushRegistry = PKPushRegistry(queue: mainQueue)
voipRegistry.delegate = self
voipRegistry.desiredPushTypes = [PKPushType.voIP]
}
func pushRegistry(_ registry: PKPushRegistry, didInvalidatePushTokenFor type: PKPushType) {
//
}
func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType) {
//
}
func pushRegistry(_ registry: PKPushRegistry, didUpdate pushCredentials: PKPushCredentials, for type: PKPushType) {
//
}
func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType, completion: @escaping() -> Void) {
//
}