如何在应用程序为前台时显示本地通知 [英] How to show local notification when app is foreground

问题描述

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

How to show local notification always, even in foreground, using new (from iOS 10) notification framework UserNotifications https://developer.apple.com/reference/usernotifications?language=objc ?

推荐答案

#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();
}

这可以帮到你。 ：）

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