从 HealthKit 获取 HKQuantitySample -> heartRateSample (Watch OS2) date/time

Question

我正在使用

-(void)updateHeartRate:(NSArray<__kindof HKSample *> *)samples

从内部手表传感器检索 HearteRate。根据应用程序在后台（停用）的时间，必须使用以下方法检索几个 heartRateSamples：

if (samples.count>0) {

    for (HKQuantitySample *heartRateSample in samples) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (heartRateSample) {
            NSLog(@"HEART RATE: %@", [@([heartRateSample.quantity doubleValueForUnit:heartRateUnit]) stringValue]);
            }
        });
    }
}

但是当特定示例写入 HealthKit 时，我如何检索 date/time？

Answer 1

数量样本的开始日期和结束日期属性描述了样本的采集时间：

HK_CLASS_AVAILABLE_IOS(8_0)
@interface HKSample : HKObject

@property (readonly, strong) HKSampleType *sampleType;

@property (readonly, strong) NSDate *startDate;
@property (readonly, strong) NSDate *endDate;

@end

从 HealthKit 获取 HKQuantitySample -> heartRateSample (Watch OS2) date/time

Get date/time for HKQuantitySample -> heartRateSample (Watch OS2) from HealthKit

healthkit

watchkit

watchos-2