The Core iOS Developer’s Cookbook, Fifth Edition

Testing for Sensors

As you read earlier in this chapter, you can use the application’s Info.plist file to require or exclude onboard sensors. You can also test in-app for each kind of sensor support by querying a Core Motion CMMotionManager object:

Click here to view code image

if (motionManager.gyroAvailable)     [motionManager startGyroUpdates]; if (motionManager.magnetometerAvailable)     [motionManager startMagnetometerUpdates]; if (motionManager.accelerometerAvailable)     [motionManager startAccelerometerUpdates]; if (motionManager.deviceMotionAvailable)     [motionManager startDeviceMotionUpdates];