AppDelegate.m

#import <Parse/Parse.h>
#import "AppDelegate.h"

static NSString * const kParseApplicationID = @"";
static NSString * const kParseClientKey     = @"";

@interface AppDelegate ()
@end

@implementation AppDelegate
            
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [Parse setApplicationId:kParseApplicationID clientKey:kParseClientKey];

    [[UIApplication sharedApplication] registerForRemoteNotifications];

    UIMutableUserNotificationAction *acceptAction = [UIMutableUserNotificationAction new];
    acceptAction .identifier = @"ACCEPT_IDENTIFIER";
    acceptAction .title = @"Accept";
    acceptAction .activationMode = UIUserNotificationActivationModeBackground;
    acceptAction .destructive = NO;
    acceptAction .authenticationRequired = NO;

    UIMutableUserNotificationAction *maybeAction = [UIMutableUserNotificationAction new];
    maybeAction .identifier = @"MAYBE_IDENTIFIER";
    maybeAction .title = @"Maybe";
    maybeAction .activationMode = UIUserNotificationActivationModeBackground;
    maybeAction .destructive = NO;
    maybeAction .authenticationRequired = NO;

    UIMutableUserNotificationAction *declineAction = [UIMutableUserNotificationAction new];
    declineAction .identifier = @"DECLINE_IDENTIFIER";
    declineAction .title = @"Decline";
    declineAction .activationMode = UIUserNotificationActivationModeBackground;
    declineAction .destructive = YES;
    declineAction .authenticationRequired = NO;

    UIMutableUserNotificationCategory *inviteCategory = [UIMutableUserNotificationCategory new];
    inviteCategory.identifier = @"INVITE_CATEGORY";
    [inviteCategory setActions:@[acceptAction, maybeAction, declineAction] forContext:UIUserNotificationActionContextDefault];
    [inviteCategory setActions:@[acceptAction, declineAction] forContext:UIUserNotificationActionContextMinimal];

    NSSet *categories = [NSSet setWithObjects:inviteCategory, nil];
    UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:categories];

    [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];

    return YES;
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
    UILocalNotification *localNotification = [UILocalNotification new];
    localNotification.alertBody = @"Local notification";
    localNotification.category = @"INVITE_CATEGORY";
    [application scheduleLocalNotification:localNotification];
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSLog(@"deviceToken:%@", deviceToken);
    PFInstallation *installation = [PFInstallation currentInstallation];
    [installation setDeviceTokenFromData:deviceToken];
    [installation saveInBackground];
}

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    NSLog(@"didFailToRegisterForRemoteNotificationsWithError:%@", error);
}

- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
    NSLog(@"notificationSettings:%@", notificationSettings);
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    NSLog(@"application:%@ didReceiveRemoteNotification:%@ fetchCompletionHandler:%@", application, userInfo, completionHandler);

    if (completionHandler) {
        completionHandler(UIBackgroundFetchResultNoData);
    }
}

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void (^)())completionHandler {
    NSLog(@"identifier:%@ userInfo:%@ completionHandler:%@", identifier, userInfo, completionHandler);

    if ([identifier isEqualToString:@"ACCEPT_IDENTIFIER"]) {
        // ...
    } else if ([identifier isEqualToString:@"MAYBE_IDENTIFIER"]) {
        // ...
    }
    
    if (completionHandler) {
        completionHandler();
    }
}

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler {
    NSLog(@"identifier:%@ notification:%@ completionHandler:%@", identifier, notification, completionHandler);

    if ([identifier isEqualToString:@"ACCEPT_IDENTIFIER"]) {
        // ...
    } else if ([identifier isEqualToString:@"MAYBE_IDENTIFIER"]) {
        // ...
    }

    if (completionHandler) {
        completionHandler();
    }
}

@end