当应用程序处于前台时如何显示本地通知

Posted 2023-02-23

【中文标题】当应用程序处于前台时如何显示本地通知

【英文标题】：How to show local notification when app is foreground

【发布时间】：2016-10-06 10:14:15

【问题描述】：

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

【问题讨论】：

添加你的语言标签

【参考方案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();

希望这会对您有所帮助。 :)

【讨论】：

Sommm，你在哪里设置了前台显示通知的参数？因为看起来我做了同样的事情，但通知只在后台模式下显示。显示出现在通知栏中的 meens。

你以前用过这个解决方案吗？

应用处于活动状态时显示通知？

关键在于实现 willPresentNotification 并使用“None”以外的值调用完成处理程序。见UNUserNotificationCenterDelegate Docs

【参考方案2】：

 You can do this way.  

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

    dispatch_async(dispatch_get_main_queue(),^

    NSLog(@"alertbody ..%@",  notification.alertBody);
    NSLog(@"title ..%@",  notification.alertTitle);
    NSLog(@"action ..%@",  notification.alertAction);
    NSLog(@"userinfo..%@",  notification.userInfo);
    [[NSNotificationCenter defaultCenter]postNotificationName:@"NotificationReceived" object:nil userInfo:notification.userInfo];
          );



//in present view controller
-(void)viewDidLoad

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(notificationReceivedMethod:) name:@"NotificationReceived" object:nil];


-(void) viewWillDisappear:(BOOL)animated 

 [[NSNotificationCenter defaultCenter]removeObserver:self name:@"NotificationReceived" object:nil];


-(void)notificationReceivedMethod

//create you custom popup or view

【讨论】：

不不不！我询问了 iOS 10 的 UserNotification 框架