CODEWITHSUNDEEP
swiftswift3
Euan
Euan

Reputation: 43

Accelerometer in CoreMotion Not Working In Swift 3

My app uses CoreMotion to allow the player to move when the device is tilted. It worked perfectly in Swift 2 but when I updated it to Swift 3 it has stopped working. I am not receiving any accelerometer updates.

override func didMove(to view: SKView) {
    manager.startAccelerometerUpdates()
    manager.accelerometerUpdateInterval = 0.1
    manager.startAccelerometerUpdates(to: OperationQueue.main){ (data, Error) in
        if let accelerometerData = self.manager.accelerometerData {
            self.physicsWorld.gravity = CGVector(dx: accelerometerData.acceleration.y * 10, dy: accelerometerData.acceleration.x * 10)
        }
    }
}

Upvotes: 3

Views: 1224

Answers (1)

Coder-256
Coder-256

Reputation: 5618

NSError has been renamed to Error in Swift 3, so please make your Error variable camelCase (lowercase in your situation). It should have been camelCase since it's a variable, anyways.

Here is a new version of the function with that and other minor errors fixed (NOTE MY COMMENT ABOUT SWAPPING X AND Y):

override func didMove(to view: SKView) {
    manager.accelerometerUpdateInterval = 0.1
    manager.startAccelerometerUpdates(to: OperationQueue.main) { data, _ in
        if let accelerometerData = data {
            // IMPORTANT: Are you intentionally swapping x and y here? -----------> ↓
            self.physicsWorld.gravity = CGVector(dx: accelerometerData.acceleration.y * 10,
                                                 dy: accelerometerData.acceleration.x * 10)
        }
    }
}

And here is the original function with just the variable renamed (NOTE: There are a few programming mistakes in here, I don't recommend using it):

override func didMove(to view: SKView) {

    manager.startAccelerometerUpdates()
    manager.accelerometerUpdateInterval = 0.1
    manager.startAccelerometerUpdates(to: OperationQueue.main) { (data, error) in

        if let accelerometerData = self.manager.accelerometerData {
            self.physicsWorld.gravity = CGVector(dx: accelerometerData.acceleration.y * 10, dy: accelerometerData.acceleration.x * 10)
        }

    }
}

EDIT: You should not use the main queue as your OperationQueue for recieving Accelerometer updates. See Apple's documentation.

Upvotes: 2

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