當應用程序在後臺時使用NSNotifier來調用方法

Question

我正在使用NSNotifier來創建一個鬧鐘，當達到時間設置時調用方法。當應用程序處於前臺時，我可以成功地運行它。但是在後臺時，我只能得到一個通知來呈現。

當應用程序在後臺時是否可以調用使用NSNotifier的方法？如果是的話，我該如何做到這一點？

這裏是我到目前爲止的代碼： -

appdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ProcessDidComplete:) name:@"ProcessDidComplete" object:nil]; 
} 

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification 
{ 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ProcessDidComplete" object:nil]; 
} 

- (void) ProcessDidComplete:(NSNotification *)pNotification 
{ 
    NSString *processData; 
    processData = @"Processing Data"; 
} 

viewcontroller.m

-(void)addLocalNotification 
{ 
    UILocalNotification *notification = [[UILocalNotification alloc] init]; 
    notification.repeatInterval = NSMinuteCalendarUnit; 
    notification.fireDate = [NSDate dateWithTimeIntervalSinceNow:1]; 
    notification.alertBody = @"This is local notification!"; 
    notification.timeZone = [NSTimeZone defaultTimeZone]; 

    [[UIApplication sharedApplication] scheduleLocalNotification:notification]; 
} 

Answer 1

根據文檔，-application:didReceiveLocalNotification:只有被調用時，應用程序在前臺。

請參閱文檔UIApplicationDelegate和handling local and remote notifications。