iOS 10 Request Notification Permission fires twice - ios

Question

When I launch my app on iOS 10, I get the request notification permission twice.
The first one briefly appears and disappears immediately without allowing me to do any actions, then I got the second popup with a normal behaviour waiting for "allow" or "deny" from the user.
Here is my code that worked well before iOS 10.
In the method didFinishLaunchingWithOptions from the AppDelegate :
if ([application respondsToSelector:#selector(registerUserNotificationSettings:)]) {
#ifdef __IPHONE_8_0
UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIRemoteNotificationTypeBadge
|UIRemoteNotificationTypeSound
|UIRemoteNotificationTypeAlert) categories:nil];
[application registerUserNotificationSettings:settings];
#endif
} else {
UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
[application registerForRemoteNotificationTypes:myTypes];
}
Should I implement something for iOS 10 in order to fix this double request permission ?

Answer 1

For iOS 10 we need to call the UNUserNotificationCenter in appDelegate didFinishLaunchingWithOptions method.
First we must import the UserNotifications framework and add the UNUserNotificationCenterDelegate in Appdelegate
AppDelegate.h
#import <UIKit/UIKit.h>
#import <UserNotifications/UserNotifications.h>
#interface AppDelegate : UIResponder <UIApplicationDelegate,UNUserNotificationCenterDelegate>
#property (strong, nonatomic) UIWindow *window;
#end
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if([[[UIDevice currentDevice]systemVersion]floatValue]<10.0)
{
[[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
[[UIApplication sharedApplication] registerForRemoteNotifications];
}
else
{
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
center.delegate = self;
[center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error)
{
if( !error )
{
[[UIApplication sharedApplication] registerForRemoteNotifications];
NSLog( #"Push registration success." );
}
else
{
NSLog( #"Push registration FAILED" );
NSLog( #"ERROR: %# - %#", error.localizedFailureReason, error.localizedDescription );
NSLog( #"SUGGESTIONS: %# - %#", error.localizedRecoveryOptions, error.localizedRecoverySuggestion );
}
}];
}
return YES;
}
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