iOS 7後臺抓取

Question

我目前正在使用一個iOS應用程序，其中我正在使用[[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];。根據我以這種方式實施的文檔。

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

    NSLog(@"Launched in background %d", UIApplicationStateBackground == application.applicationState); 

    [[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum]; 
    i =0; 

    return YES; 
} 


-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { 
    NSLog(@"Fetch started"); 
    ++i;  

    // Set up Local Notifications 
    [[UIApplication sharedApplication] cancelAllLocalNotifications]; 
    UILocalNotification *localNotification = [[UILocalNotification alloc] init]; 
    NSDate *now = [NSDate date]; 
    localNotification.fireDate = now; 

    localNotification.soundName = UILocalNotificationDefaultSoundName; 
    localNotification.alertBody = @"BG Mode"; 
    localNotification.applicationIconBadgeNumber = i; 

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification]; 

    completionHandler(UIBackgroundFetchResultNewData); 
    NSLog(@"Fetch completed"); 
} 

我的問題是我試圖調試它知道這種方法調用的頻率。我沒有得到任何澄清。我用60秒的時間間隔進行了測試，但那也不起作用。請給我任何想法或建議。提前致謝 。

Answer 1

只是爲了澄清，你也設置在Info.plist中的UIBackgroundModes按照Apple的文檔......

此屬性的應用程序沒有任何影響不具有與獲取價值UIBackgroundModes關鍵在Info.plist文件中。