我可以继续阅读 HealthKit 的步骤吗？

Question

目的是当用户走完所需的步骤时触发一个方法。这是我的代码：

if ([HKHealthStore isHealthDataAvailable]) {
        self.healthStore = [[HKHealthStore alloc] init];
        NSSet *stepsType =[NSSet setWithObject:[HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]];
        [self.healthStore requestAuthorizationToShareTypes:nil readTypes:stepsType completion:^(BOOL success, NSError * _Nullable error) {
            if (success) {
                __block double stepsCount = 0.0;
                HKSampleType *sampleType = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];
                HKSampleQuery *sampleQuery = [[HKSampleQuery alloc] initWithSampleType:sampleType predicate:nil limit:HKObjectQueryNoLimit sortDescriptors:nil resultsHandler:^(HKSampleQuery *query, NSArray *results, NSError *error) {
                    if (!error && results>0) {
                        for (HKQuantitySample *result in results) {
                            stepsCount += [result.quantity doubleValueForUnit:[HKUnit countUnit]];
                        }
                    }
                }];
                [self.healthStore executeQuery:sampleQuery];
                double currentSteps = stepsCount;
                while (1) {
                    [self.healthStore stopQuery:sampleQuery];
                    [self.healthStore executeQuery:sampleQuery];
                    if (currentSteps + requiredSteps >= stepsCount) {
                        [self triggerOneMethod];
                        break;
                    }
                }
            }
        }];
    }

但是当我运行应用程序时，Xcode 显示：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: 'You cannot start a query that is already active'
***

我已经阅读了 HealthKit 文档，它说

HealthKit executes queries asynchronously on a background queue. Most queries automatically stop after they have finished executing.

和stopQuery:是停止长运行宁查询。

我觉得这两点才是最重要的。

是否可以达到目的？如果是这样，我该如何解决？

Answer 1

在循环中，必须在调用executeQuery:之前创建一个新的HKSampleQuery。您不能重复使用 HKQuery 实例。

我可以继续阅读 HealthKit 的步骤吗？

Can I keep reading steps with HealthKit?

iphone

objective-c

ios

healthkit

hksamplequery