ios - 无法将类型 '(CMDeviceMotion?, NSError?) -> ()' 的值转换为预期的参数类型 'CMDeviceMotionH

Question

我最近升级了我的 xcode。我目前使用 9.2 我正在使用 CMMotionManger，此错误显示在新版本中。我尝试解决它但找不到解决方案。

func startCameraTracking() {
        motionManager.deviceMotionUpdateInterval = 1.0 / 60.0


        motionManager.startDeviceMotionUpdatesToQueue(OperationQueue.main) {
            [weak self](data: CMDeviceMotion?, error: NSError?) in

            guard let data = data else { return }

            let attitude: CMAttitude = data.attitude
            self?.cameraNode.eulerAngles = SCNVector3Make(Float(attitude.roll + M_PI/2.0), -Float(attitude.yaw), -Float(attitude.pitch))
        }
    }

Answer 1

根据 Michael 的建议，您最好查看最新的引用资料:

(startDeviceMotionUpdatesToQueue(_: withHandler:) 重命名为 startDeviceMotionUpdates(to:withHandler:)。)

startDeviceMotionUpdates(to:withHandler:)

Declaration

func startDeviceMotionUpdates(to queue: OperationQueue, 
                  withHandler handler: @escaping CMDeviceMotionHandler)

---

CMDeviceMotionHandler

Declaration

typealias CMDeviceMotionHandler = (CMDeviceMotion?, Error?) -> Void

---

对于 startDeviceMotionUpdates(to:withHandler:) 的第二个参数，您需要传递一个带有 CMDeviceMotion? 和 Error? 的闭包，不是 NSError?:

func startCameraTracking() {
    motionManager.deviceMotionUpdateInterval = 1.0 / 60.0

    motionManager.startDeviceMotionUpdates(to: OperationQueue.main) {
        [weak self](data: CMDeviceMotion?, error: Error?) in

        guard let data = data else { return }

        let attitude: CMAttitude = data.attitude
        self?.cameraNode.eulerAngles = SCNVector3Make(Float(attitude.roll + .pi/2.0), -Float(attitude.yaw), -Float(attitude.pitch))
    }
}