Question

我正在尝试在我的项目中使用UILocalNotification。我希望我的应用程序在后台每5秒钟（不停止）收到通知。我正在尝试以下代码。安装后，它仅在5秒后第一次通知我的应用程序。我想让它每5秒钟不停地通知。我怎样才能实现它？

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];

    // Initiating notification at app startup
    [self InitiateLocalNotification];

    return YES;
}

-(void) InitiateLocalNotification
{

    NSDate *notificationDate = [NSDate dateWithTimeIntervalSinceNow:5];

    UILocalNotification *notify = [ [UILocalNotification alloc] init ];

    notify.fireDate = notificationDate;

    //notify.applicationIconBadgeNumber = 1;

    notify.soundName = UILocalNotificationDefaultSoundName;

    notify.timeZone = [NSTimeZone defaultTimeZone];

    //notify.alertBody = @"Local notification test";

    //notify.repeatInterval = 1;

    NSDictionary *infoDict = [NSDictionary dictionaryWithObject:@"notifiValue" forKey:@"notifiKey"];
    notify.userInfo = infoDict;

    // Schedule the notification
    [[UIApplication sharedApplication] scheduleLocalNotification:notify];
    [notify release];

}

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

}

Answer 1

你只是在打电话 [self InitiateLocalNotification];

一次，因此只安排一个通知。

您必须安排您希望收到的每个通知（从现在起5秒后安排通知，从现在开始10秒......等），因为您没有对重复间隔进行那种控制。

解决方案是在收到通知时安排下一个通知，但这不会导致通知间隔5秒钟。

Answer 2

我认为，如果您收到通知，则需要再次注册通知

您的代码可以是：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{ // Override point for customization after application launch.

self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];

// Initiating notification at app startup
[self InitiateLocalNotification];

return YES;
}


-(void) InitiateLocalNotification
{

NSDate *notificationDate = [NSDate dateWithTimeIntervalSinceNow:5];

UILocalNotification *notify = [ [UILocalNotification alloc] init ];

notify.fireDate = notificationDate;

//notify.applicationIconBadgeNumber = 1;

notify.soundName = UILocalNotificationDefaultSoundName;

notify.timeZone = [NSTimeZone defaultTimeZone];

//notify.alertBody = @"Local notification test";

//notify.repeatInterval = 1;

NSDictionary *infoDict = [NSDictionary dictionaryWithObject:@"notifiValue" forKey:@"notifiKey"]; notify.userInfo = infoDict;

// Schedule the notification
[[UIApplication sharedApplication] scheduleLocalNotification:notify];
[notify release];
}

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification 
{
  // Need to register again
  [self InitiateLocalNotification];
}

iPhone：UILocalNotification不会重复通知

2 个答案: