core-motion

I am trying to collect coreMotion acceleration data in the background for longer than 10 minutes. This must be possible since apps like Sleep Cycle do this. I just want to make sure this is allowed though, since it does not seem to be one of these: Apps that play audible content to the user while in the background, such as a music player app Apps that record audio content while in the background. Apps that keep users informed of their location at all times, such as a navigation app Apps that support Voice over Internet Protocol (VoIP) Apps that need to download and process new content

NOTICE : This question was originally posted before Apple introduced motion-detection hardware and associated APIs in the iOS SDK. Answers to this question, however, remain relevant. I'm creating an iPhone iOS app which involves tracking a user's running and / or walking. It is very important that the recorded results of the users runs and walks remain honest. I need a way to catch a user who may be cheating (or accidentally have left the tracker on) when using a car. To check if the user is driving or riding in a car I first thought of these two checks, however neither can really determine if

I have two ways of getting the magnetic fields (strength, x, y, and z) using the iOS device's magnetometer. 1) Core Location Used the CLHeading from CLLocationManagerDelegate method locationManager:didUpdateHeading: . This is similar to Apple's Teslameter sample app. 2) Core Motion Used CMMagneticField from CMMotionManager 's magnetometerData.magneticField . Questions: a) What is the difference between the two? I am getting different values from both. I was expecting that they will return the same values. The difference is most notable when I start the app from a resting position (face up in a

I'm using the following code to get accelerometer data (using CoreMotion framework): CMMotionManager *motionManager = [[CMMotionManager alloc] init]; motionManager.accelerometerUpdateInterval = 1.0 / 60.0; [motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) { NSLog(@"ACCELEROMETER DATA = %@",accelerometerData); }]; When the app is in foreground mode, I'm receiving the log, but when it enters background, I receive the log only when the music in the app is playing. I've added the following to app

With the M7 chip in the latest iOS devices one can get programmatically notified as the user goes from stationary to running, walking, etc using CMMotionActivityManager. Stava and Runkeeper have both used this to auto-pause GPS polling (shut off the GPS antenna) when it detects the user isn't moving via the M7, and then re-enable GPS updates once they are moving again. It is able to do this while the app is in the background state, which is the key here. The issue I run into while duplicating this functionality is that if I turn off GPS updates while my app is in the background I stop