I have an app that receives remote push notification.
I have implemented didReceiveRemoteNotification in this way:
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
print("PUSH NOTIFICATION is coming")
let state: UIApplicationState = UIApplication.shared.applicationState
let inBackground = state == .background
let dizionario = userInfo["aps"]! as! NSDictionary
let alert = dizionario["alert"]! as! String
print(alert)
if(!inBackground){
print("APP IN FOREGROUND")
//show alert view and the if user tap 'ok' show webview
}
else{
print("APP IS BACKGROUND")
//SHOW WEBVIEW
}
}
In both cases(when app is in foreground and background) I have to show webview that add like child to root view(tabbar controller) but if app is in foreground then I have to show , before , an alert view.
My problem is that if app is in foreground I haven't problems , but if app is in background didReceiveRemoteNotification doesn't call(I don't see the print "PUSH NOTIFICATION is coming" ) and I don't understand why.
Can you help me?
N.B for testing I use APN Tester(https://itunes.apple.com/it/app/apn-tester-free/id626590577?mt=12) for send push notification
didReceiveRemoteNotification is meant to be used when the app is active.
When the app is in the background or inactive, you can activate it by pressing the action button on the remote notification. Implement userNotificationCenter(_:didReceive:withCompletionHandler:) in your app delegate.
In AppDelegate.swift :
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
// make your function call
}
didReceive mean is: when your Application is Background then you click the notification didReceive is working
Related
I'm configuring push notifications in Swift. So far I have 3 scenarios.
1 - App In Foreground
In the foreground, I think I did everything correct cus I did receive the push notification data.
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
print("userNotificationCenter willPresent")
let content = notification.request.content
UIApplication.shared.applicationIconBadgeNumber = 0
UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
completionHandler([.alert, .sound])
}
2 - User clicks on the Push Notification banner
This is also working fine.
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: #escaping () -> Void) {
print("userNotificationCenter didReceive")
defer {
completionHandler()
}
guard response.actionIdentifier == UNNotificationDefaultActionIdentifier else {
return
}
let content = response.notification.request.content
UNUserNotificationCenter.current().removeAllDeliveredNotifications()
}
3 - App in background, then the user gets into the app
In this scenario, the push notification arrives at the user's phone. But, instead of clicking on the push notification itself, they get into the app. And I can't fetch any info from the push notification
Could anyone help on how to configure the 3rd scenario? Thank you.
you need to consider applicationState
UIApplication.State
//AppDelegate
func application(_ application: UIApplication,
didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
switch UIApplication.shared.applicationState {
case .active:
print("Received push message from APNs on Foreground")
case .background:
print("Received push message from APNs on Background")
case .inactive:
print("Received push message from APNs back to Foreground")
}
}
When the app is background to foreground, UIApplication.State is inactive
inactive is 'The app is running in the foreground but is not receiving events.'
thus I think the best way to do the behavior you want is to write it yourself.
for example,
//AppDelegate
func application(_ application: UIApplication,
didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
switch UIApplication.shared.applicationState {
case .active:
print("Received push message from APNs on Foreground")
case .background:
print("Received push message from APNs on Background")
case .inactive:
print("Received push message from APNs back to Foreground")
guard let nav = window?.rootViewController as? UINavigationController,
let currentVC = nav.viewControllers.last else {return}
if currentVC is 'youWantViewController' { //if you want ViewController, use notification post
let name = Notification.Name(rawValue: K.Event.pushRequest)
NotificationCenter.default.post(name: name, object: nil)
} else { //move to you want ViewController
let vc = 'yourViewController'()
root.navigationController?.pushViewController(vc, animated: true)
}
}
completionHandler(.newData)
}
I hope it will be of help.
Actually I need to read those notification instead of tapping the notification banner.
I have used this code
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {}
But this function only gets called when the app is in foreground or the notification banner gets tapped by the user.
I need bunch of code to read the code in Background.
I am using OneSignal Push Notification service.
You can able get the notification responce before notification banner shows. no need tap on notification banner.
#available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.sound, .alert, .badge])
UIApplication.shared.applicationIconBadgeNumber = 0
alertRemoteNotification(notification.request.content.userInfo as NSDictionary
}
I know there has been a lot written about this topic but I just can't find the right answer.
Is there a way how to know when the user received remote notification and when the user clicked on one on iOS 8.
I would like to know this because when I receive it I want to save it and when user clicks on it I want to open some view.
I have found this answer https://stackoverflow.com/a/16393957/1241217 but the problem is when user is in the app and opens notification center and clicks on one, the app is not inactive and not in the background.
I also found this answer https://stackoverflow.com/a/12937568/1241217 but I know that this is ran only when the app is killed and started from new.
I also don't want to do this https://stackoverflow.com/a/32079458/1241217 since I need to detect when I received notification.
So is there a way how to know if the user only clicked on notification. As far as I understood it has to be done in didReceiveRemoteNotification but I don't know how to separate between them. And I need an answer for before iOS 10 because the app target is iOS 8.
MY SOLUTION:
So as I wrote in the comment of Shabbir Ahmad answer my solution was to remember date when the application did become active and the date when the notification was received. If the difference between this dates was a second or less I accepted that as the user clicked on the notification.
You have to implement UNUserNotificationCenterDelegate and its method
userNotificationCenter(_:willPresent:withCompletionHandler:) and userNotificationCenter(_:didReceive:withCompletionHandler:) which gets called when a user taps a notification. In willPresent: you have to call the completionHandler with an option that would indicate what should happen when a notification arrives while the app is in foreground.
Registering such a delegate is easy:
UNUserNotificationCenter.current().delegate = self
So e.g.:
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler(UNNotificationPresentationOptions.alert)
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
if let userInfo = userInfo as? [String: Any] {
// TODO: implement your logic
// just don't forget to dispatch UI stuff on main thread
}
}
You can implement that delegate by AppDelegate, but also by any NSObject, I would go with the latter to keep AppDelegate as clean as possible.
P.S.: Of course, this assumes that you have been granted permissions by the user (UNUserNotificationCenter.current().requestAuthorization(options:completionHandler:)) and you are registered to accept notifications (UIApplication.shared.registerForRemoteNotifications()).
Read more in Scheduling and Handling Local Notifications, section Responding to the Delivery of Notifications - while the section is about local notifications, it is exactly the same for the remote ones (they are handled both by the same delegate).
when you click on notification in background mode before ios 10 and when you are in foreground,in both cases your below method will call,
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void)
So you can differentiate the behaviour,
First of all you assign a boolean variable in AppDelegate class like this:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var isUserTapOnNotification = false
after that make true isUserTapOnNotification in
func applicationWillEnterForeground(_ application: UIApplication) {
isUserTapOnNotification = tue
}
because when you tap on notification bar, your app will came in foreground and applicationWillEnterForeground will call first,
after that your didReceiveRemoteNotification will call:
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
if #available(iOS 10.0, *) {
//do nothing
}else { //<ios 10
if isUserTapOnNotification == true {//when app is in background and user tap on notification bar
//do action whatever you want
} else { //when user is in foreground and notification came,
//before ios10,notification bar not display in foreground mode,So you can show popup by using userInfo
}
}
after that applicationDidBecomeActive will call and you reset isUserTapOnNotification to false like this:
func applicationDidBecomeActive(_ application: UIApplication) {
isUserTapOnNotification = false
}
I hope this answer will help you.
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 can get the push notification message in this method :
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
}
But the problem is how to display an alert notification when the app is runing as the same way it displayed when the app is in background.
Is that possible ?
When the app in foreground, you only get the callback, iOS doesn't show alert in that case, you have to do it yourself...
You can do it like this:
Create a nib for the 'PN foreground view', for example:
And when you get a PN in foreground, you can instantiate the view, and add it to the UIWindow with animation, code for example:
// init and configure your custom PN foreground view
let nib = UINib(nibName: self.nibName, bundle: NSBundle(forClass: PnForegroundView))
pnForegroundView = nib.instantiateWithOwner(nil, options: nil)[0] as! PnForegroundView
pnForegroundView.setWidth(UIScreen.width)
pnForegroundView.setHeight(63)
pnForegroundView.title = <some title from notification>
pnForegroundView.image = <some image from notification>
// add the view to the key window
let window = UIApplication.sharedApplication().keyWindow!
window.addSubview(pnForegroundView!)
// Change window level to hide the status bar
window.windowLevel = UIWindowLevelStatusBar
// Show the PN foreground view with animation:
self.pnForegroundView!.setBottom(0)
self.changeWindowLevelToHideStatusBar()
UIView.animateWithDuration(0.2) {
self.pnForegroundView!.setBottom(self.pnForegroundView!.height)
}
Of course, you should set a delegate for this view, for case user clicking the notification, and when the user dismisses it.
Also, you can add time for automatic dismissal.
Last thing - when removing the PnForegroundView, you better reset your UIWindow level to default value, for showing the status bar
Adding that completionHandler line to appDelegate method worked for me:
//Called when a notification is delivered to a foreground app.
#available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
print("User Info = ",notification.request.content.userInfo)
completionHandler([.alert, .badge, .sound])
}
didReceiveRemoteNotification will trigger no matter whether you are foreground or in background Though, you can handle them seperately as below
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
let state = UIApplication.sharedApplication().applicationState
if state == UIApplicationState.Active {
//show alert here your app is in foreground
}
else{
//your app is in background
}
}