while the app is in background didReceiveLocalNotification is not called.
So I try to get the notification from didFinishLaunchingWithOptions
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
UILocalNotification *notification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
//...
}
But My App is with Background Mode enable (using external accessory communication)
When click on the notification, didFinishLaunchingWithOptions is not called.
Any other way to retrieve notification ?
By checking Apple's document about notifications, it says:
iOS Note: In iOS, you can determine whether an application is launched
as a result of the user tapping the action button or whether the
notification was delivered to the already-running application by
examining the application state. In the delegate’s implementation of
the application:didReceiveRemoteNotification: or
application:didReceiveLocalNotification: method, get the value of the
applicationState property and evaluate it. If the value is
UIApplicationStateInactive, the user tapped the action button; if the
value is UIApplicationStateActive, the application was frontmost when
it received the notification.
As far as I know, when your app is in background-running state, and there comes a local notification, you won't receive any method call, the notification will be displayed to user, but if user tap the notification and thus reactive your app, you will receive -didReceiveLocalNotification: call.
Related
I show my local notification like this periodically.
UILocalNotification *notification = [[UILocalNotification alloc]init];
[notification setAlertBody:#"Test test"];
[notification setUserInfo:#{#"test": #"test"}];
[[UIApplication sharedApplication] presentLocalNotificationNow:notification];
I need to detect back that notification and I plan to write here.
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
It always call that function whether user tap on notification or it automatically call in foreground.
So, I separate using this.
if (application.applicationState == UIApplicationStateActive)
When I show notification center, it become InActive. But, it still call didReceiveLocalNotification. I can't differentiate whether user tap on notification from notification center or because of my periodic posting notification.
How can I really know that I tap on notification (Either from InActive State or Background State) in didReceiveLocalNotification?
Assuming that I understood your issue correctly, I stumbled on the same obstacle and couldn't find a super clean solution.
So the situation where the following method
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
is called and applicationState is equal to UIApplicationStateInactive happens in two cases:
the app is in the foreground and the notification has just been fired
the notification has been fired some time ago, notification center is pulled down and user tapped on the notification
One way to distinguish these two cases is to check the notification's fireDate:
notification.fireDate.timeIntervalSinceNow < 0.5
If this expression is true, it's very likely that the first case happened. If the expression is false, it's very likely that the second case happened.
This solution depends on the system delivering the notification without delay and/or the user not being fast enough to click the notification in the notification center under 500ms since the notification's firing. I'm not sure how likely is it for a firing delay to happen. I guess it's possible if the device is under some kind of processing load.
I hope there is a cleaner solution, hopefully someone will share it.
First of all, read this from Apple Documentation:
The user taps a custom action button in an iOS 8 notification. In this
case, iOS calls either
application:handleActionWithIdentifier:forRemoteNotification:completionHandler:
or
application:handleActionWithIdentifier:forLocalNotification:completionHandler:.
In both methods, you get the identifier of the action so that you can
determine which button the user tapped. You also get either the remote
or local notification object, so that you can retrieve any information
you need to handle the action.
The user taps the default button in the alert or taps (or clicks) the
app icon. If the default action button is tapped (on a device running
iOS), the system launches the app and the app calls its delegate’s
application:didFinishLaunchingWithOptions: method, passing in the
notification payload (for remote notifications) or the
local-notification object (for local notifications). Although
application:didFinishLaunchingWithOptions: isn’t the best place to
handle the notification, getting the payload at this point gives you
the opportunity to start the update process before your handler method
is called.
Second, this is how you can differentiate whether didReceiveLocalNotification: is called from active or inactive state:
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
UIApplicationState appState = UIApplicationStateActive;
if ([application respondsToSelector:#selector(applicationState)])
appState = application.applicationState;
if (appState == UIApplicationStateActive)
{
}
else
{
}
}
application:didReceiveLocalNotification:
Sent to the delegate when a running app receives a local notification.
Check this:
iOS UILocalNotification - No delegate methods triggered when app is running in background and the icon is clicked upon notification
Use KVO key-value-observing to know and do something when the button is tapped.
Here is the situation that I want to handle quoted from Apple's documentation.
As a result of the presented notification, the user taps the action button of the alert or taps (or clicks) the application icon.
If the action button is tapped (on a device running iOS), the system launches the application and the application calls its delegate’s application:didFinishLaunchingWithOptions: method (if implemented); it passes in the notification payload (for remote notifications) or the local-notification object (for local notifications).
If the application icon is tapped on a device running iOS, the application calls the same method, but furnishes no information about the notification . If the application icon is clicked on a computer running OS X, the application calls the delegate’s applicationDidFinishLaunching: method in which the delegate can obtain the remote-notification payload.
How do I handle this situation if there is no information about the notification?
If I understand you correctly, it sounds like you have a UILocalNotification that has been fired, but you need to still handle it if the user taps the application icon instead of the notification. Correct?
If this is the case, then to my knowledge you won't be able to handle the notification from the app delegate, because the app is not being launched or brought out of the background by the notification, but instead by the user's interaction.
However, if you are setting a badgeNumber on the application with the notification then you could try something like this:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if (launchOptions[UIApplicationLaunchOptionsLocalNotificationKey]) {
UILocalNotification *notification = launchOptions[UIApplicationLaunchOptionsLocalNotificationKey];
} else if ([UIApplication sharedApplication].applicationIconBadgeNumber > 0) {
// Assume that user launched the app from the icon with a notification present.
}}
You may also have to check the badgeNumber in - (void)applicationDidBecomeActive:(UIApplication *)application as well.
Improve to #Aron Crittendon answer:
Consider also to handle that in applicationDidBecomeActive:
-(void)applicationDidBecomeActive:(UIApplication *)application
{
if ([UIApplication sharedApplication].applicationIconBadgeNumber > 0) {
//application is in background, fired notification and user tapped app icon with badge
}
}
As the documentation states, if you tap the icon on iOS (and not the notification's alert/banner) then the same method is called but you get no notification information. There is no way to handle a local notification simply by tapping the app icon.
If a push notification is displayed to the user and the user taps it and the app is brought to the foreground from a background state then how can the app get the payload of the notification?
Because the app is already running didFinishLaunchingWithOptions: won't get called and because the app was in the background when the push arrived didReceiveRemoteNotification: won't have been called.
There are two places so I usually make a method that handles both something like this:
- (void)handleMessageFromRemoteNotification:(NSDictionary *)userInfo
Then in: application:didFinishLaunchingWithOptions:
if ([launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]) {
[self handleMessageFromRemoteNotification:launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey]];
}
also in: application:didReceiveRemoteNotification:
[self handleMessageFromRemoteNotification:userInfo
If you want to do something different if the app is running check application.applicationState == UIApplicationStateActive in didReceiveRemoteNotification
According to Apple documentation the method didFinishLauchingWithOptions: is called when the user taps the action button of the notification.
As a result of the presented notification, the user taps the action
button of the alert or taps (or clicks) the application icon. If the
action button is tapped (on a device running iOS), the system launches
the application and the application calls its delegate’s
application:didFinishLaunchingWithOptions: method (if implemented); it
passes in the notification payload (for remote notifications) or the
local-notification object (for local notifications).
Then in this method it is easy to recover the content of the notification by doing for example :
UILocalNotification *localNotif =
[launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
if (localNotif) {
NSString *itemName = [localNotif.userInfo objectForKey:ToDoItemKey];
[viewController displayItem:itemName]; // custom method
app.applicationIconBadgeNumber = localNotif.applicationIconBadgeNumber-1;
}
"because the app was in the background when the push arrived didReceiveRemoteNotification: won't have been called."
This, or didReceiveRemoteNotification:withExpirationHandler, should get called if the app is in the background and gets switched to the foreground when the user taps on the notification.
However I got into a situation when this wasn't working as the reason was the content of the push was incorrect, I can't remember the details but double check what's in there.
I would like to know if there is a way to know if an app (which can be closed or open in background) has been launched with a click on:
a notification (in the notification center) ?
or the app icon on the springboard ?
Thanks !!
put this code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UILocalNotification *notification = launchOptions[UIApplicationLaunchOptionsLocalNotificationKey];
if (notification) {
// launched from notification
} else {
// from the springboard
}
}
in your UIApplicationDelegate.
From Apple Docs on Scheduling, Registering, and Handling Notifications
:
iOS Note: In iOS, you can determine whether an application is launched as a result of the user tapping the action button or whether the notification was delivered to the already-running application by examining the application state. In the delegate’s implementation of the application:didReceiveRemoteNotification: or application:didReceiveLocalNotification: method, get the value of the applicationState property and evaluate it. If the value is UIApplicationStateInactive, the user tapped the action button; if the value is UIApplicationStateActive, the application was frontmost when it received the notification.
I'm trying to handle all possible cases with remote notifications.
I'm ok when app in foreground - didReceiveRemoteNotification is called.
The problem is when app in background state, and I receive push notification.
Nothing is called.
how to let user know that he has new remote notification when app come back to foreground ?
The only way for you to intercept a push notification is when the user tap the notify in the notification center (or when slide the app icon from the lock screen).
In this case before the app go in foreground the didFinishLaunchingWithOptions method in the app delegate is called. You should use the NSDictionary launchOptions to determine if the app has been launched from notification center or by tapping the icon (the normal use)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSDictionary *pushDic = [launchOptions objectForKey:#"UIApplicationLaunchOptionsRemoteNotificationKey"];
if (pushDic != nil) {
NSLog(#"Notification");
}
else {
}
}
Just have a look into the programming guide:
If the action button is tapped (on a device running iOS), the system launches the application and the application calls its delegate’s application:didFinishLaunchingWithOptions: method (if implemented); it passes in the notification payload (for remote notifications) or the local-notification object (for local notifications).
Of course, if your app is in background, there will be nothing called...
If your app is not launched (not even suspended in background), the
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
will contain the notification payload (key UIApplicationLaunchOptionsRemoteNotificationKey):
NSDictionary *remoteNotification = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey];