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SwiftUIでAppleWatchのモーションデータを取得する

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はじめに

こんにちは、HappyManaです。
AppleWatchでSwiftでモーションデータを取得する方法はあったのですが、SwiftUIに書き直したかったので、SwiftUIでAppleWatchのモーションデータを取得して表示する処理を書きました。

コード

import SwiftUI
import WatchKit
import CoreMotion

struct GetMotionData: View {
    
    private var motion = CMMotionManager()
    
    @State var roll: Double = 0
    @State var pitch: Double = 0
    @State var yaw: Double = 0
    @State var rotationRateX: Double = 0
    @State var rotationRateY: Double = 0
    @State var rotationRateZ: Double = 0
    @State var gravityX: Double = 0
    @State var gravityY: Double = 0
    @State var gravityZ: Double = 0
    @State var accelerationX: Double = 0
    @State var accelerationY: Double = 0
    @State var accelerationZ: Double = 0

    // 取得を開始
    func startUpdates() {
        if motion.isDeviceMotionAvailable {
            motion.deviceMotionUpdateInterval = 1 / 60
            motion.startDeviceMotionUpdates(to: OperationQueue.current!) { [self] (motionData, error) in
                guard let data = motionData else {
                    print("Device Motion Error: \(String(describing: error))")
                    return
                }

                roll = data.attitude.roll
                pitch = data.attitude.pitch
                yaw = data.attitude.yaw
                rotationRateX = data.rotationRate.x
                rotationRateY = data.rotationRate.y
                rotationRateZ = data.rotationRate.z
                gravityX = data.gravity.x
                gravityY = data.gravity.y
                gravityZ = data.gravity.z
                accelerationX = data.userAcceleration.x
                accelerationY = data.userAcceleration.y
                accelerationZ = data.userAcceleration.z
                
                let motionDataString = "\(roll),\(pitch),\(yaw),\(rotationRateX),\(rotationRateY),\(rotationRateZ),\(gravityX),\(gravityY),\(gravityZ),\(accelerationX),\(accelerationY),\(accelerationZ)"
                print(motionDataString)
            }
        }
    }
    // 取得を終了
    func stopUpdates() {
        if motion.isDeviceMotionAvailable {
            motion.stopDeviceMotionUpdates()
        }
    }

    // view
    var body: some View {
        VStack(spacing: 1) {
            Text("roll: \(roll)")
            Text("pitch: \(pitch)")
            Text("yaw: \(yaw)")
            Text("rotationRateX: \(rotationRateX)")
            Text("rotationRateY: \(rotationRateY)")
            Text("rotationRateZ: \(rotationRateZ)")
            Text("gravityX: \(gravityX)")
            Text("gravityY: \(gravityY)")
            Text("gravityZ: \(gravityZ)")
            Text("accelerationX: \(accelerationX)")
            Text("accelerationY: \(accelerationY)")
            Text("accelerationZ: \(accelerationZ)")
        }
        // 画面が表示されたら取得を開始する
        .onAppear {
            startUpdates()
        }
        // 画面が非表示になったら取得を終了する
        .onDisappear {
            stopUpdates()
        }
    }
}

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