HealthKit(iOS)不会在后台传递数据(objC)

我们正在尝试让HealthKit在后台工作,以便在应用程序关闭时将步骤数据提供给我们的服务器.

为了实验目的,我们在XCode中创建了一个全新的iOS项目,启用了HealhtKit和Compabilities中的所有后台模式.之后,我们几乎运行代码(见下文).

那么首先发生的是应用程序要求我们授予的权限.我们期望的是应用程序应该每小时将数据传递到服务器.但它没有这样做,似乎应用程序不能做任何事情,当它不活跃.

该应用程序仅在恢复或启动时才提供数据,但根本不提供背景信息(软关闭/硬关闭)

appdelegate.m：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [self setTypes];
    return YES;
}


-(void) setTypes
{
    self.healthStore = [[HKHealthStore alloc] init];

    NSMutableSet* types = [[NSMutableSet alloc]init];
    [types addObject:[HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]];

    [self.healthStore requestAuthorizationToShareTypes: types
                                             readTypes: types
                                            completion:^(BOOL success,NSError *error) {

                                                dispatch_async(dispatch_get_main_queue(),^{
                                                    [self observeQuantityType];
                                                    [self enableBackgroundDeliveryForQuantityType];
                                                });
                                            }];
}

-(void)enableBackgroundDeliveryForQuantityType{
    [self.healthStore enableBackgroundDeliveryForType: [HKQuantityType quantityTypeForIdentifier: HKQuantityTypeIdentifierStepCount] frequency:HKUpdateFrequencyImmediate withCompletion:^(BOOL success,NSError *error) {
    }];
}


-(void) observeQuantityType{

    HKSampleType *quantityType = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];

    HKObserverQuery *query =
    [[HKObserverQuery alloc]
     initWithSampleType:quantityType
     predicate:nil
     updateHandler:^(HKObserverQuery *query,HKObserverQueryCompletionHandler completionHandler,NSError *error) {

         dispatch_async(dispatch_get_main_queue(),^{
             if (completionHandler) completionHandler();
             [self getQuantityResult];

         });
     }];
    [self.healthStore executeQuery:query];
}


-(void) getQuantityResult{

    NSInteger limit = 0;
    NSPredicate* predicate = nil;

    NSString *endKey =  HKSampleSortIdentifierEndDate;
    NSSortDescriptor *endDate = [NSSortDescriptor sortDescriptorWithKey: endKey ascending: NO];

    HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType: [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]
                                                           predicate: predicate
                                                               limit: limit
                                                     sortDescriptors: @[endDate]
                                                      resultsHandler:^(HKSampleQuery *query,NSArray* results,NSError *error){

                                                          dispatch_async(dispatch_get_main_queue(),^{
                                                                // sends the data using HTTP
                                                              [self sendData: [self resultAsNumber:results]];

                                                          });
                                                      }];
    [self.healthStore executeQuery:query];
}

解决方法

我看到可能在AppDelegate中引起问题的内容,特别是这一行：

[[NSURLConnection alloc] initWithRequest:request delegate:self];

这是创建一个NSURLConnection,但不启动它.尝试改为：

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];

编辑：再次查看文档后

他们建议在您的应用程序中设置观察器查询didFinishLaunchingWithOptions：方法.在上面的代码中,将HKObserverQuery设置在授权处理程序中,该处理程序在随机的后台队列中调用.尝试进行此更改以在主线程上进行设置：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [self setTypes];
    [self observeQuantityType];
    return YES;
}

HKObserverQuery Reference