应用未运行时的Healthkit后台传递

Question

如果HealthKit后台交付未运行，是否可以启动该应用程序？特别是在终止状态下？

Answer 1

在iOS 8.1中可以。不过，您需要确保在应用程序委托的中重新创建观察者查询application:didFinishLaunchingWithOptions:。8.0中的错误完全阻止了HealthKit的后台通知。

编辑：

在您的AppDelegate中：

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

    //create/get your HKHealthStore instance (called healthStore here)

    //get permission to read the data types you need.

    //define type, frequency, and predicate (called type, frequency, and predicate here, appropriately)

    UIBackgroundTaskIdentifier __block taskID = [application beginBackgroundTaskWithExpirationHandler:^{

        if (taskID != UIBackgroundTaskInvalid) {

            [application endBackgroundTask:taskID];

            taskID = UIBackgroundTaskInvalid;

        }

    }];

    [healthStore enableBackgroundDeliveryForType:type frequency:frequency withCompletion:^(BOOL success, NSError *error) {}];

    HKQuery *query = [[HKObserverQuery alloc] initWithSampleType:healthType predicate:predicate updateHandler:

        ^void(HKObserverQuery *query, HKObserverQueryCompletionHandler completionHandler, NSError *error)

        {

            //If we don't call the completion handler right away, Apple gets mad. They'll try sending us the same notification here 3 times on a back-off algorithm.  The preferred method is we just call the completion handler.  Makes me wonder why they even HAVE a completionHandler if we're expected to just call it right away...

            if (completionHandler) {

                completionHandler();

            }

            //HANDLE DATA HERE

            if (taskID != UIBackgroundTaskInvalid) {

                [application endBackgroundTask:taskID];

                taskID = UIBackgroundTaskInvalid;

            }

        }];

    [healthStore executeQuery:query];

}