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2013-07-18T06:46:17.047
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2016-07-08T13:57:21.400
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2016-07-08T13:57:21.400
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I was just having this same problem, and wouldn't you know it, the solution was in the documentation ;) The problem is with the block format. All of the tutorials seem to favor that method, but Apple recommends periodic polling of the <code>CMMotionManager</code> as a more performance oriented approach. The block format adds overhead. From the <code>CMMotionManager</code> Class Reference: <blockquote> To handle motion data by periodic sampling, the app calls a “start” method taking no arguments and periodically accesses the motion data held by a property for a given type of motion data. This approach is the recommended approach for apps such as games. Handling accelerometer data in a block introduces additional overhead, and most game apps are interested only the latest sample of motion data when they render a frame. </blockquote> So what you want to do, from the docs again: <blockquote> Call startAccelerometerUpdates to begin updates and periodically access CMAccelerometerData objects by reading the accelerometerData property. </blockquote> Something along these lines <pre><code>CMMotionManager *mManager = [(AppDelegate *)[[UIApplication sharedApplication] delegate] sharedManager]; [mManager startAccelerometerUpdates]; </code></pre> Then, in some sort of periodically updating method of your choosing: <pre><code>CMMotionManager *mManager = [(SEPAppDelegate *)[[UIApplication sharedApplication] delegate] sharedManager]; CMAccelerometerData *aData = mManager.accelerometerData; </code></pre> This solution appears to work as well as <code>UIAccelerometer</code> on an iPhone 4 from the limited testing I've done.
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