How to replace UIAccelerometer with CMMotionManager?

Question

I\'m new to iOS development.

I follow the tutorial from Ray Wenderlich to create a little location based AR app. However, the tutorial uses an AR Toolkit which has n

Answer 1

Try this link: https://www.inkling.com/read/learning-ios-programming-alasdair-allan-2nd/chapter-9/the-core-motion-framework

I'm learning a few tidbits that translate some-what with the UIAccelerometer

i.e.

[self setAccelometerManager [UIAccelerometer sharedAccelerometer]];

could become

[self.motionManager = [[CMMotionManager alloc] init];

Setting manual update intervals like

[[self accelerometerManager] setUpdateInterval: 0.25];

you can have

self.motionManager.accelerometerUpdateInterval = 0.25;

and releasing the delegate

self.accelerometerManager.delegate = nil;

would now be

[self.motionManager stopDeviceMotionUpdates];

Also from the link, I ended up doing something like this:

motionManager = [[CMMotionManager alloc] init];

motionManager.accelerometerUpdateInterval  = 1.0/10.0; // Update at 10Hz

if (motionManager.accelerometerAvailable) {
    queue = [NSOperationQueue currentQueue];
    [motionManager startAccelerometerUpdatesToQueue:queue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
        switch (currentOrientation) {
            case UIDeviceOrientationLandscapeLeft:
                viewAngle = atan2(accelerometerData.acceleration.x, accelerometerData.acceleration.z);
                break;
            case UIDeviceOrientationLandscapeRight:
                viewAngle = atan2(-accelerometerData.acceleration.x, accelerometerData.acceleration.z);
                break;
            case UIDeviceOrientationPortrait:
                viewAngle = atan2(accelerometerData.acceleration.y, accelerometerData.acceleration.z);
                break;
            case UIDeviceOrientationPortraitUpsideDown:
                viewAngle = atan2(-accelerometerData.acceleration.y, accelerometerData.acceleration.z);
                break;  
            default:
                break;
        }
        [self updateCenterCoordinate];
    }];

}