iOS 10，当应用程序处于前台时显示本地通知？

Posted 2023-02-24

【中文标题】iOS 10，当应用程序处于前台时显示本地通知？

【英文标题】：iOS 10, Local notification show when app is in foreground?

【发布时间】：2016-10-14 12:56:54

【问题描述】：

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

在应用委托中：

- (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!");
            
        ];

    
 

现在这样做之后我仍然没有在前台收到通知。

提前致谢。

【问题讨论】：

参考我的回答from here它可能对你有帮助！

willPresentNotification 是否出现在控制台日志中？如果应用不在在前台，您会看到通知警报吗？

是的@matt，当我的应用程序不在前台时，我会看到警报，即通知，但它没有出现在前台。

@Lion，您提到的答案是针对 UILocalNotification。我想使用 iOS 10 UserNotification 框架。用于在前台显示通知。

另外，还有一件事……我已经设置了委托，但没有调用 UserNotification 委托。

【参考方案1】：

请实现这个功能：

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler

    completionHandler(UNNotificationPresentationOptionAlert + UNNotificationPresentationOptionSound);

【讨论】：

在他给出的示例中不明白这已经实现了吗？

【参考方案2】：

为了在应用程序处于前台时获得通知，您需要在 iOS10 中实现 UNUserNotificationCenterDelegate 的以下委托方法。

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) 

    completionHandler([.alert,.badge])

有关更多信息，您可以参考苹果文档。这是链接：

https://developer.apple.com/documentation/usernotifications/unusernotificationcenterdelegate?language=objc

【参考方案3】：

请参阅此代码以在前台处理本地通知。 /*******************************/

  UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

            UNAuthorizationOptions options = UNAuthorizationOptionAlert + UNAuthorizationOptionSound;

            [center requestAuthorizationWithOptions:options
                                  completionHandler:^(BOOL granted, NSError * _Nullable error) 
                                      if (!granted) 
                                          //NSLog(@"Something went wrong");
                                      
                                  ];

            int dayCounter =5;

            int minute = 48;


           
                NSDateComponents *components = [[NSDateComponents alloc] init];
                components.weekday = dayCounter;


                 dayCounter++;

                components.hour = 12;
                components.minute = minute;

                UNCalendarNotificationTrigger *trigger =  [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:YES];

                UNMutableNotificationContent *objNotificationContent = [[UNMutableNotificationContent alloc] init];
                objNotificationContent.title = [NSString localizedUserNotificationStringForKey:@"Notification!" arguments:nil];

                objNotificationContent.body = [NSString localizedUserNotificationStringForKey:@"We made a surprise Edit for You" arguments:nil];

                objNotificationContent.sound = [UNNotificationSound defaultSound];

                objNotificationContent.badge = @([[UIApplication sharedApplication] applicationIconBadgeNumber] + 1);


                UNNotificationAttachment *attachment = nil;

                NSURL* outputURL = [[NSURL alloc] initFileURLWithPath:filePath];
                NSError *attachmentError = nil;

                attachment = [UNNotificationAttachment attachmentWithIdentifier:@"image"
                                                                            URL: outputURL
                                                                        options:nil
                                                                          error:&attachmentError];
                if (attachmentError) 

                    return;
                

                objNotificationContent.attachments=@[attachment];

                NSString *identifier = @"UYLLocalNotification";
                UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier
                                                                                      content:objNotificationContent trigger: trigger];

                [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) 
                    if (error != nil) 
                        NSLog(@"Something went wrong: %@",error);
                    
                    else
                    
                    
                ];

/****************************/

// 处理 -(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification

    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) 

        dispatch_async(dispatch_get_main_queue(), ^
            UIAlertView *alert =[[UIAlertView alloc]initWithTitle:@"Reminder" message:notification.alertBody delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Yes", nil];
            alert.tag = 330;
            [alert show];
        );
    
else
 // handle for background

【参考方案4】：

要在应用程序处于前台时显示横幅消息，请使用以下方法。

将其添加到 AppDelegate 中的委托方法并符合此协议 - UNUserNotificationCenterDelegate

iOS 10、斯威夫特 3：

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) 
    completionHandler(UNNotificationPresentationOptions.alert)

【参考方案5】：

在屏幕顶部显示警报

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler

    completionHandler(UNNotificationPresentationOptionAlert + UNNotificationPresentationOptionSound);

【讨论】：

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