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對象存在於firebase上。基於對象ID打開詳細視圖。 當應用程序在背景執行它工作正常，當應用程序被殺害的功能從RxSwift Firebase數據庫快照<null>何時處理launchOptions？[UIApplicationLaunchOptionsKey.remoteNotification]
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: @escaping() -> Void)
打來電話，通知處理快照回來空。
應用代表：
AppName.shared.user.shareReplayLatestWhileConnected().filterNil().distinctUntilChanged({ lhs, rhs in
return lhs.key == rhs.key
}).subscribe() { event in
switch event {
case .next(let user):
self.userIdString = user.key
...
if let notificationInfo = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? [AnyHashable: Any] {
self.handleMessageFromRemoteNotification(notificationInfo)
}
}...
處理程序：
Event.load(url.lastPathComponent).single().subscribe(onNext: { event in
//prepare and present view here...
}).addDisposableTo(disposeBag)
失敗事件加載功能：
static func load(_ id: String) -> Observable<Event> {
return Observable.create() { observer in
FirebaseDatabase.sharedInstance.ref.child("events/\(id)").observeSingleEvent(of: .value, with: {
snapshot in
//This the null snapshot
if snapshot.exists() {
if let event = Event(snapshot: snapshot) {
observer.onNext(event)
}
observer.on(.completed)
} else {
observer.on(.completed)
}
})
return Disposables.create()
}
}