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

Question

我最近升级了我的xcode。 我目前正在使用 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

正如Michael所建议的，你最好检查一下最新的参考资料：

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

startDeviceMotionUpdates(to:withHandler:)

声明

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

---

CMDeviceMotionHandler

声明

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

---

对于startDeviceMotionUpdates(to:withHandler:)的第二个参数，你需要传递一个闭包，取CMDeviceMotion?和Error?，而不是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))
}
}