ios - 如何在应用程序处于前台时显示本地通知

Question

如何使用新的(来自 iOS 10 的)通知框架 UserNotifications 始终显示本地通知，即使在前台也是如此 https://developer.apple.com/reference/usernotifications?language=objc ？

Answer 1

#import <UserNotifications/UserNotifications.h>
#define SYSTEM_VERSION_GRATERTHAN_OR_EQUALTO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

//interface
 @interface AppDelegate : UIResponder <UIApplicationDelegate,UNUserNotificationCenterDelegate>

@end

//implementation
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
    [self registerForRemoteNotifications];
    return YES;
}

- (void)registerForRemoteNotifications {
    if(SYSTEM_VERSION_GRATERTHAN_OR_EQUALTO(@"10.0")){
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error){
             if(!error){
                 [[UIApplication sharedApplication] registerForRemoteNotifications];
             }
         }];  
    }
    else {
        // Code for old versions
    }
}

////...........Handling delegate methods for UserNotifications........
//Called when a notification is delivered to a foreground app.

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
    NSLog(@"User Info : %@",notification.request.content.userInfo);
    completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge);
}

//Called to let your app know which action was selected by the user for a given notification.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler{
    NSLog(@"User Info : %@",response.notification.request.content.userInfo);
    completionHandler();
}

希望这对你有所帮助。 :)