watchOS2 - CMSensorRecorder

Question

我想使用 Apple Watch 的加速度计历史数据，但我的 accDataList 始终为零。我在class的init函数中实例化了CMSensorRecorder。有人以前遇到过这个问题吗？

func startMovementDetection(){
    self.cmSensorRecorder?.recordAccelerometerFor(self.recorderDuration)
    self.startDate = NSDate()
}

func extractHistoricalAccelerometerData(){
    var accDataList = self.cmSensorRecorder!.accelerometerDataFrom(self.startDate, to: NSDate())
    NSLog("AccDataList : \(accDataList)")
    if accDataList != nil {
        accDataList = accDataList as CMSensorDataList
        for accData in accDataList {
            self.addHistoricalAccDataToMovementArray((accData as? CMRecordedAccelerometerData)?.acceleration)
        }
        self.sendDataToIphone()
    }        
}

日志如下所示：

2015-07-11 22:02:55.279 emmoveDataWatchOS 扩展[2158:2428612] 开始录制

2015-07-11 22:02:55.279 emmoveDataWatchOS 扩展[2158:2428612] AW：开始运动更新

2015-07-11 22:02:55.279 emmoveDataWatchOS 扩展[2158:2428612] AW EMWatchManager: startMovementDetection

2015-07-11 22:02:55.279 emmoveDataWatchOS 扩展[2158:2428612] 可选（CMSensorRecorder: 0x797733d0）

2015-07-11 22:10:51.483 emmoveDataWatchOS 扩展[2158:2428612] AW：定格动画更新

2015-07-11 22:10:51.484 emmoveDataWatchOS Extension[2158:2428612] 从 Optional(2015-07-11 20:02:55 +0000) 提取数据到 2015-07-11 20:10:51 +0000

2015-07-11 22:10:51.484 emmoveDataWatchOS 扩展[2158:2428612] 可选（CMSensorRecorder: 0x797733d0）

2015-07-11 22:10:51.486 emmoveDataWatchOS 扩展[2158:2428612] AccDataList：无

Answer 1

也许你可以试试

func startMovementDetection(){
    self.startDate = NSDate()
    self.cmSensorRecorder?.recordAccelerometerFor(self.recorderDuration)
}

然后看看

Answer 2

CMSensorRecorder 也有一个错误：您应该等待 3 到 5 分钟才能重新启动 Recorder，否则列表将始终 return nil。（您可以观看 Apple 的视频了解更多详细信息。）

Answer 3

我遇到了同样的问题，在这个 post:

中找到了解决方案

https://forums.developer.apple.com/thread/15470

"It apparently does not like the charger to be plugged in on the watch when starting recroding"

只需断开设备与充电器的连接。有道理，但当然没有正式记录在任何地方...

Answer 4

确保已启用“设置”>“隐私”>“运动与健身”>“健身追踪”。

如果它被禁用，CMSensorRecorder.accelerometerData() 似乎总是 return 零，即使

CMSensorRecorder.isAccelerometerRecordingAvailable() == true

和

CMSensorRecorder.authorizationStatus() == .authorized

watchOS2 - CMSensorRecorder

watchOS2 - CMSensorRecorder

javascript

core-motion

watchos-2