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我正在制作一个可以记录用户加速的 Watch 应用。我已经使用CMSensorRecorder框架CoreMotion来执行此操作。

现在程序的流程是用户按下手表上的按钮，触发加速度记录30秒。在此之后，有6分钟的延迟（参考这里的回答：watchOS2 - CMSensorRecorder，读取数据需要延迟），并将加速度和时间戳数据打印到控制台。

现在我在运行应用程序时收到“响应无效”和“发生错误”。我在info.plist文件中添加了动作使用说明。

我对 Swift 和应用程序开发还很陌生，我担心我尝试访问数据的方式有问题。我在下面附上了控制台日志和代码。

任何人都可以提供一些关于这些消息的见解以及如何解决这个问题吗？我已经四处搜索，但之前没有发现任何与此问题相关的案例。干杯。

    func recordAcceleration(){
        if CMSensorRecorder.isAccelerometerRecordingAvailable(){
            print("recorder started")
            recorder.recordAccelerometer(forDuration: 30)   //forDuration controls how many seconds data is recorded for.
            print("recording done")
        }
    }

    func getData(){
        if let list = recorder.accelerometerData(from: Date(timeIntervalSinceNow: -400), to: Date()){
            print("listing data")

            for data in list{
                if let accData = data as? CMRecordedAccelerometerData{
                    let accX = accData.acceleration.x
                    let timestamp = accData.startDate
                    //Do something here.
                    print(accX)
                    print(timestamp)
                }
            }
        }

    }


    //Send data to iphone after time period.
    func sendData(dataBlock:CMSensorDataList){
        WCSession.default.transferUserInfo(["Data" : dataBlock])
    }



    //UI Elements
    @IBAction func recordButtonPressed() {
        print("button pressed")
        recordAcceleration()

        //A delay is needed to read the data properly.
        print("delaying 6 mins")
        perform(#selector(callback), with: nil, afterDelay: 6*60)

    }

    @objc func callback(){
        getData()
    }

    extension CMSensorDataList: Sequence {
    public func makeIterator() -> NSFastEnumerationIterator {
        return NSFastEnumerationIterator(self)
    }


Console output:

button pressed

recorder started

2019-03-12 12:12:12.568962+1100 app_name WatchKit Extension[233:5614] [Motion] Warning - invoking recordDataType:forDuration: on main may lead to deadlock.

2019-03-12 12:12:13.102712+1100 app_name WatchKit Extension[233:5614] [SensorRecorder] Response invalid.

recording done

delaying 6 mins

2019-03-12 12:18:13.115955+1100 app_name WatchKit Extension[233:5614] [Motion] Warning - invoking sensorDataFromDate:toDate:forType: on main may lead to deadlock.

2019-03-12 12:18:13.162476+1100 app_name WatchKit Extension[233:5753] [SensorRecorder] Error occurred while trying to retrieve accelerometer records!
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1 回答 1

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我运行了您的代码，但没有收到“响应无效”或“发生错误”。我确实收到了主线程警告。所以我改为后台线程，它工作正常。

另外，我认为您不需要等待六分钟。我把它改成了一分钟。

我希望这有帮助。

let recorder = CMSensorRecorder()
@IBAction func recordAcceleration() {
    if CMSensorRecorder.isAccelerometerRecordingAvailable() {
        print("recorder started")
        DispatchQueue.global(qos: .background).async {
            self.recorder.recordAccelerometer(forDuration: 30)
        }
        perform(#selector(callback), with: nil, afterDelay: 1 * 60)
    }
}
@objc func callback(){
    DispatchQueue.global(qos: .background).async { self.getData() }
}
func getData(){
    print("getData started")
    if let list = recorder.accelerometerData(from: Date(timeIntervalSinceNow: -60), to: Date()) {
        print("listing data")
        for data in list{
            if let accData = data as? CMRecordedAccelerometerData{
                let accX = accData.acceleration.x
                let timestamp = accData.startDate
                //Do something here.
                print(accX)
                print(timestamp)
            }
        }
    }
}
于 2019-03-15T23:06:07.093 回答