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