My iOS app launches buggy (no launch image, safe areas aren't observed, tab bar doesn't show, etc.) when it's opened from a remote notification (when the user taps a push notification to open the app from a terminated state). I don't want the push notification to have any special functionality at all, I want it as plain as possible.
This is how I have my notifications configured in the App Delegate:
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
setupUserNotifications()
return true
}
private func setupUserNotifications() {
let notifications = UNUserNotificationCenter.current()
let connectionMessages = UNNotificationCategory(identifier: "connectionMessageNotification",
actions: [],
intentIdentifiers: [],
options: UNNotificationCategoryOptions.init())
let interactionMessages = UNNotificationCategory(identifier: "interactionMessageNotification",
actions: [],
intentIdentifiers: [],
options: UNNotificationCategoryOptions.init())
notifications.delegate = self
notifications.setNotificationCategories([connectionMessages, interactionMessages])
notifications.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
if granted {
DispatchQueue.main.async {
UIApplication.shared.registerForRemoteNotifications()
}
} else {
print(if: error)
}
}
}
And this is how I handle the delegate (doing nothing and just calling completion):
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: #escaping () -> Void) {
print("did tap remote notification")
completionHandler()
}
Is there a step I'm missing? Am I supposed to implement application(_:willFinishLaunchingWithOptions:)? What I don't understand is that if the user launches the app by tapping a push notification, shouldn't the app just launch normally without having to take any extra steps?
The problem was that my app was configured to receive background push notifications and it would launch the app in the background (before the user tapped on the notification) and so when the user did tap on the notification to launch the app it would sometimes, I guess, catch it in some intermediate state and the UI would look all funky. I assume that there are extra steps that one would need to take to handle launching the app through a background notification. Regardless, by disabling background notifications, the app now launches when the user taps on the push notification as normal. Whew.
Related
The thing is we don't want to interact with push notifications. The one thing we want to do is to detect when device has received one while out app was active.
We are going to use this detected information to change screen brightness for example.
The thing is we just want to detect the ones shows on the screen by iOS.
if we use this in in AppDelegate.swift to get permission.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
UNUserNotificationCenter.current().requestAuthorization(options:[.badge, .alert, .sound]) { (granted, error) in
if granted {
UIApplication.shared.registerForRemoteNotifications()
}
}
return true
}
and that to detect and to do something when received notification.
func userNotificationCenter(center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: () -> Void) {
}
Application asks permission showing
"App Name" Would Like to Send You Notifications
message.
But we do not want to send notification we just want to detect any notification showed on screen by iOS when our app was running.
There is no indication to your app when iOS displays a notification from another app if the user does not interact with it; the notification is simply overlaid on top of your screen.
If the user taps the notification then the usual app delegate methods will fire as your app moves to the background and then suspended state
I am using firebase push notification, where my app is subscribed to a topic, all is good. But I want to know if it is possible to show the notification if pass a notification. this is my scene:
local_user_id = 10
var payload = {
notification: {
title: "hi",
body: "this is a notification",
sound: "default"
},
data: {
user_id: "1",
message: "you should pay $3020.25"
}
};
1) control if user is_login (true/false)
2)get the message data of notification and check:
if (payload.data.user_id = local_user_id && is_login){
show_notification()
}
3) show notification
Actually I only have the notification and no more, I am new with firebase, this is my code:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
(granted, error) in
}
application.registerForRemoteNotifications()
FirebaseApp.configure()
return true
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
let dict = userInfo["aps"] as! NSDictionary
let message = dict["alert"]
print("response")
print(message)
}
I don't know how to do that what I want, is it posible?
thanks in advance
You can not control show hide notification in your application. You can put some logic on the backend side, whether this notification should be displayed or not. Nevertheless, I have workaround below possible way.
Use a silent push. Then trigger local notifications. Note: Silent
push isn't always reliable.
So just include content-available: 1 in your payload as shown
below to get a silent notification.it will act as silent notification.
Also in Info.plist should have UIBackgroundModes set to
remote-notification
but it'll be limited to Running and background mode only. you won't be able to receive or handle it if content-available is set to 0 while your app is offline
If you are trying to just present the notification to the user while the app is running in the foreground, you would need to have your AppDelegate conform to the UNUserNotificationCenterDelegate. This is because when the application is running, the notifications will be presented to the UNUserNotificationCenter shared object.
extension AppDelegate: UNUserNotificationCenterDelegate {
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void {
let content = notification.request.content
if content.data["user_id"] == local_user_id && is_login {
completionHandler(.alert)
} else {
completionHandler([])
}
}
}
You would want to make sure that the completionHandler is executed at some point in this block, because this is the handler that does the presentation of the notification. If you want a silent notification, you can use completionHandler([]) to silence the alert. Other possible options for the completionHandler are available here.
I know similar questions have been asked many times. But it is still very confusing to me after reading those threads, especially after UNUserNotificationCenter is introduced in iOS 10.
The official documentation mentioned 3 methods where I can handle remote notifications:
Implement userNotificationCenter:willPresentNotification:withCompletionHandler: to handle a notification when the app is in foreground.
Implement userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler: when the app is in background or not running.
But the documentation also mentioned: In iOS and tvOS, the system delivers the notification payload to the application:didReceiveRemoteNotification:fetchCompletionHandler: method of the app delegate.
So,
To handle a remote notification when app is in background/inactive, should I put my code in application delegate method in 3, or the notificationCenter delegate in 2? Since UNUserNotificationCenter is only available for iOS>10, should I write different code to handle each case?
About 1, it is only available after iOS 10. How can I handle remote notifications when app is running in foreground before iOS 10?
And, more confusing: In case the app is in background, when are the delegate methods called: when the notification message is received? or when the user taps the notification?
Related: iOS push notification: how to detect if the user tapped on notification when the app is in background?
iOS 10 and later:
1) userNotificationCenter willPresent notification: Generally used to decide what to do when user is already inside the app and a notification arrives. You could possibly trigger a remote notification inside the app. After the user taps on the remote notification, method 2 (didReceive response) gets called.
#available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (_ options: UNNotificationPresentationOptions) -> Void) {
//Handle push from foreground
//When a notification arrives and your user is using the app, you can maybe notify user by showing a remote notification by doing this
completionHandler([.alert, .badge, .sound])
//To print notification payload:
print(notification.request.content.userInfo)
}
2) userNotificationCenter didReceive response: Generally used to redirect the user to a particular screen of the app after user taps on the notification.
#available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
//Handle push from background or closed (or even in foreground)
//This method is called when user taps on a notification
//To print notification payload:
print(response.notification.request.content.userInfo)
}
Below iOS 10:
3) application didReceiveRemoteNotification:
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
//To print notification payload
print(userInfo)
if #available(iOS 10.0, *) {
}
else {
//Handle remote notifications for devices below iOS 10
if application.applicationState == .active {
//app is currently in foreground
}
else if application.applicationState == .background {
//app is in background
}
else if application.applicationState == .inactive {
//app is transitioning from background to foreground (user taps notification)
}
}
}
4) application didFinishLaunchingWithOptions launchOptions: The only scenario which is left for devices below iOS 10 is when app is closed and user taps on the notification launching the app. You'll have to check the following method for this scenario.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
//To print notification payload:
if let notification = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? [AnyHashable: Any] {
print(notification)
}
}
LaunchOptions is a dictionary indicating the reason the app was
launched (if any). The contents of this dictionary may be empty in
situations where the user launched the app directly.
Now to answer your questions,
To handle a remote notification when app is in background/inactive, you'll have to add your code in method 2 (userNotificationCenter didReceive response) for devices with iOS 10 and above. Also, you'll have to use method 3 (application didReceiveRemoteNotification) for devices below iOS 10.
To handle remote notifications when app is running in foreground before iOS 10, use the method 3 active state.
In addition to the great answer by Ameya, I wanted to point out that userNotificationCenter:willPresent:notification does not get called if app is in background state.
My complete solution to handle all cases on iOS 10+ would be to also use application:didFinishLaunchingWithOptions:launchOptions, and check if in background state, and handle the notification there too. Your payload, however, now also needs to include the "content-available": 1 field).
I am creating a notification service using swift3 in xcode 10.
The problem now is that when a push notification comes in the background (even when the app is closed), the badge does not increase at first, but increases by 1 from the second push notification.
Furthermore, when I enter the app and come back in the background, the number of badges will be normal, but the above problem will happen again.
I tried to check the problem through delay or local notifications, but I have not been able to figure out what the problem is.
Below are the notifications related to the notifications within the AppDelegate. Push Notification Click event also works normally.
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate, NaverThirdPartyLoginConnectionDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplicationLaunchOptionsKey: Any]?) -> Bool {
UNUserNotificationCenter.current().delegate = self
UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .sound, .alert,], completionHandler: {(granted, error) in
if (granted)
{
application.registerForRemoteNotifications()
}
else{
}
})
return true
}
...
...
extension AppDelegate: UNUserNotificationCenterDelegate {
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.badge, .alert, .sound])
UIApplication.shared.applicationIconBadgeNumber = UIApplication.shared.applicationIconBadgeNumber + 1
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
print("userInfo: \(response.notification.request.content.userInfo)")
var userInfo:[AnyHashable: Any]?
let pushId:Int32 = userInfo?["uid"] as! Int32
self.moveView(pushId)// My app load method
}
}
Running app in the background state is just a brief stop on the way to the app being suspended. While suspended, an app remains in memory but does not execute any code. For this reason your code is not executing and thus badge value does not update. See these below link to about application state and background execution.
Application State
Background Execution
So better approach to solve this problem is to send send badge value inside of push notification payload. e.g
{
"aps" : {
"alert" : {
"title" : "Game Request",
"body" : "Bob wants to play poker",
"action-loc-key" : "PLAY"
},
"badge" : 5
},
"acme1" : "bar",
"acme2" : [ "bang", "whiz" ]
}
See this link to create remote notification payload
Creating the Notification Payload
Don't increase badge value programmatically unless you need to show badge for local notification. If you want to execute code on background while push notification receive, use VoIP push notification which has few restriction e.g app must be related VoIP services.
I recommend to change the push notification payload.
Thanks.
if (deviceToken == nil) {
print("There is no deviceToken saved yet.")
let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)
UIApplication.sharedApplication().registerForRemoteNotifications()
}
This my code for permission.
If your app is already open, no notification is shown but the application is responsible for updating the user interface or downloading new content.
Implement application(_:didReceiveRemoteNotification:fetchCompletionHandler:)
to handle the notification, as described in the documentation. here, you could create an alert that shows a title and message similar to the banner you'll see when receiving a standard notification.
Need to add the completionHandler part, otherwise push notification is received. but it will be not shown.
#available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (_ options: UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .badge, .sound])
}
For showing alert view while running application you have to use:
func application(_ application: UIApplication,
didReceiveRemoteNotification userInfo: [NSObject : AnyObject])
Notification payload is in the userInfo variable. You have to decide what to do with it, how to show it etc.
Docs say:
When the operating system delivers a local notification or remote
notification and the target app is not running in the foreground, it
can present the notification to the user through an alert, icon badge
number, or sound. If there is a notification alert and the user taps
or clicks an action button (or moves the action slider), the app
launches and calls a method to pass in the local-notification object
or remote-notification payload. If the app is running in the
foreground when the notification is delivered, the app delegate
receives a local or remote notification.
This means, when the app is running and receives a notification, no system alert is shown.