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I'm trying to start the accelerometer for a game I'm making using the new Swift programming language, but it doesn't seem to work. This is my code right now:

var motionManager=CMMotionManager()
var queue=NSOperationQueue()
motionManager.accelerometerUpdateInterval = (1/40)
motionManager.startAccelerometerUpdatesToQueue(queue, withHandler {(accelerometerData:CMAccelerometerData!, error:NSError!) in
    self.update(accelerometerData.acceleration)
})

I'm not getting any errors, but when I run this nothing happens (my update function isn't called). What exactly is wrong with this?

user58338
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2 Answers2

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Is the accelerometer available? check if motionManager.accelerometerAvailable is false. Maybe you just don't have it the the device you're running on.

Note that you should use something like 1.0/40.0 for the interval to be what you expect.

if you use the simulator you can't test the accelerometer. See in Can i test accelerometer effect in Xcode simulator?

Community
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surui
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Your motionManager and queue are local variables, so the objects are deallocated at the end of this function. Store them somewhere, like in an instance variable. I've made a similar mistake a bunch of times myself.

Rob N
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