iOS 和本地通知

Posted 2023-02-24

【中文标题】iOS 和本地通知

【英文标题】：iOS and local Notifications

【发布时间】：2016-07-25 16:22:21

【问题描述】：

有没有办法从应用程序向应用程序发送本地通知？

我需要每天早上向我的应用用户发送通知。那么，我可以在应用程序中添加一些代码，以便用户启动后，每天早上他或她都会收到徽章/通知？

【问题讨论】：

“ios 本地通知”的第一个 Google 搜索结果是 Local and Remote Notifications in Depth

【参考方案1】：

您可以通过执行以下操作将本地通知添加到您的 iOS 应用：

第一步

在您的 App Delegate 中注册本地通知：

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 

    // Register the app for local notifcations.

    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) 
        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil]];
    

    // Setup the local notification check.
    UILocalNotification *notification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];

    // Check if a notifcation has been received.

    if (notification) 

        dispatch_async(dispatch_get_main_queue(), ^

            // Run the notifcation.
            // Call your own custom method from here.
            // Use [notification.userInfo valueForKey:@"notification_id"] to get the associated notification id (You will need to assign an ID, when creating the notification).
        );
    

    // Ensure the notifcation badge number is hidden.
    application.applicationIconBadgeNumber = 0;

    return YES;

第二步

使用以下方法创建本地通知：

-(void)saveNotification:(NSString *)description :(NSString *)notificationID :(BOOL)locationCheck 

    // Create the notification info dictionary
    // and set the notification ID string.
    NSMutableDictionary *userInfo = [[NSMutableDictionary alloc] init];
    [userInfo setObject:notificationID forKey:@"notification_id"];

    // Setup the local notification.
    UILocalNotification *localNotification = [[UILocalNotification alloc] init];

    // Set the notification ID and type data.
    localNotification.userInfo = userInfo;

    // Set the notification description.
    localNotification.alertBody = [NSString stringWithFormat:@"%@", description];

    // Set the sound alert MP3 file.
    localNotification.soundName = [NSString stringWithFormat:@"Notification_sound_file.mp3"];

    // Set the date for the notification or set the
    // location depending on the notification type.

    if (locationCheck == NO) 

        // Fire date of your choice.
        NSDate *yourFireDate;

        // Set the reminder date.
        double interval = [yourFireDate timeIntervalSinceNow];
        localNotification.fireDate = [[NSDate date] dateByAddingTimeInterval:interval];
        localNotification.timeZone = [NSTimeZone systemTimeZone];

        // Set the notifcation repeat interval.
        localNotification.repeatInterval = 0; // No repeat.
        //localNotification.repeatInterval = NSCalendarUnitHour; // Every hour.
        //localNotification.repeatInterval = NSCalendarUnitDay; // Every day.
        //localNotification.repeatInterval = NSCalendarUnitWeekOfYear; // Once a week.
        //localNotification.repeatInterval = NSCalendarUnitMonth; // Once a month.
        //localNotification.repeatInterval = NSCalendarUnitYear; // Once a year.
    

    else if (locationCheck == YES) 

        // Set the locaton to the selected address co-ordinates.
        CLLocationCoordinate2D coordinates = CLLocationCoordinate2DMake(latitude, longitude);
        CLCircularRegion *region = [[CLCircularRegion alloc] initWithCenter:coordinates radius:100 identifier:[NSString stringWithFormat:@"region_%@", notificationID]];

        // Set the notification to be presented
        // when the user arrives at the location.
        [region setNotifyOnEntry:YES];
        [region setNotifyOnExit:NO];

        // Set the notification location data.
        [localNotification setRegion:region];
        [localNotification setRegionTriggersOnce:NO];
    

    // Save the local notification.
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

您需要创建自己的唯一 ID，才能使用此方法。 id 很重要，因为它将帮助您区分通知（您是否需要根据通知执行特定操作）。

你可以像这样调用上面的方法：

[self saveNotification:@"test notification hello world" :@"unique id" :NO];

不要忘记将 latitude 和 longitude 替换为您描述的协调员（如果您需要基于位置的本地通知）。

第三步

如果应用当前处于打开状态（在前台或通过多任务处理），您将需要在应用委托中实现另一个方法，以便处理通知：

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

    // Check if a notifcation has been received.

    if (application.applicationState == UIApplicationStateInactive) 

        // You app in running in the background but will be active,
        // should the user tap the iOS notification banner.

        // Call your own custom method from here.
        // Use [notification.userInfo valueForKey:@"notification_id"] to get the associated notification id (You will need to assign an ID, when creating the notification).
    

    else if (application.applicationState == UIApplicationStateActive) 

        // The app is open in the foreground
        // you will need to display an alert or banner
        // in your app to alert the user.

        // Call your own custom method from here.
        // Use [notification.userInfo valueForKey:@"notification_id"] to get the associated notification id (You will need to assign an ID, when creating the notification).
    

    // Ensure the notifcation badge number is hidden.
    application.applicationIconBadgeNumber = 0;

需要记住的其他几点

您最多只能设置 64 个本地通知。 （重复的通知计为一次本地通知）。 https://developer.apple.com/library/ios/documentation/iPhone/Reference/UILocalNotification_Class/ 本地通知不能有触发日期和位置区域。如果您希望在给定的时间和地点显示相同的通知，则必须创建 2 个具有相同描述的单独本地通知（一个带有日期，另一个带有位置）。

您可以使用以下方法删除所有本地通知（或特定通知）：

-(void)deleteAllNotifications 

    // Delete all the local notifications.
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
    [[UIApplication sharedApplication] cancelAllLocalNotifications];


-(void)deleteSpecificNotification:(NSString *)inputID 

    // Get the notification(s) data.
    NSArray *notificationData = [[UIApplication sharedApplication] scheduledLocalNotifications];

    // Loop through all the local notifcations and delete
    // all the notifications that match the input id string.

    for (int loop = 0; loop < [notificationData count]; loop++) 

        // Get the notification object.
        UILocalNotification *localNotification = [notificationData objectAtIndex:loop];

        // If the notification id matches the input id then delete it.

        if ([[localNotification.userInfo objectForKey:@"notification_id"] isEqualToString:inputID]) 
            [[UIApplication sharedApplication] cancelLocalNotification: localNotification];