iOS 10，应用程序在前台时显示本地通知？

Question

我想在应用程序处于前台时显示通知。下面是我为新的 usernotificationdelegate 方法所做的代码。

在应用委托(delegate)中:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"10.0")) {

        //iOS 10 handling
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {
          if (!error) {
                 NSLog(@"request authorization succeeded!");
          } }];
     } 
}

#pragma mark - User notification delegate
- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {

    NSLog(@"willPresentNotification");
    NSLog(@"%@", notification.request.content.userInfo);
    completionHandler (UNNotificationPresentationOptionAlert);
}

这是我触发本地通知的方法

-(void) fireLocalNotification:(NSString *) message
{

    NSLog(@"fire Local Notification");
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"10.0")) {

        //Notification Content
        UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
        content.body =  [NSString stringWithFormat:@"%@",message];
        content.sound = [UNNotificationSound defaultSound];

        //Set Badge Number
        content.badge = @([[UIApplication sharedApplication] applicationIconBadgeNumber] + 1);

        // Deliver the notification in five seconds.
        UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger
                                                      triggerWithTimeInterval:1.0f repeats:NO];

        //Notification Request
        UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:@"LocalNotification" content:content trigger:trigger];

        //schedule localNotification
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
            if (!error) {
                NSLog(@"add Notification Request succeeded!");
            }
        }];

    }
 }

现在在执行此操作后我仍然没有在前台收到通知。

提前致谢。

Answer 1

请实现这个功能:

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler
{
    completionHandler(UNNotificationPresentationOptionAlert + UNNotificationPresentationOptionSound);
}