How to apply 3D moving background effect using gyroscope in ios - ios

Question

I want to apply a moving background according to device orientation. If device is held vertically upright an it is rotated around y axis then the background should move left or right according to the value of rotation.
Other icons on the background will static so it will give a 3d effect. For reference i need the exact same effect as shown in this video: http://www.youtube.com/watch?v=429kM-yXGz8
The code i have developed till now is:
- (void)updateViewsWithAcceleration:(CMAcceleration)acceleration;
{
_accelX = ((acceleration.x* 0.1) + (_accelX*.9));
_accelY = ((acceleration.y* 0.1) + (_accelY*.9));
_accelZ = ((acceleration.z* 0.1) + (_accelZ*.9));
[_backgroundShadow setFrame:CGRectMake(_accelY*50,_accelZ*50, _backgroundShadow.bounds.size.width, _backgroundShadow.bounds.size.width)];
[_titleShadow setFrame:CGRectMake(_accelY*50, _accelZ*50, _titleShadow.bounds.size.width, _titleShadow.bounds.size.width)];
}

Answer 1

Just an FYI: You're looking at the acceleration, not the gyroscope; try this instead:
- (void)viewDidLoad {
[super viewDidLoad];
cmmm = [[CMMotionManager alloc] init];
if (cmmm.gyroAvailable) {
cmmm.gyroUpdateInterval = 1.0/60.0;
[cmmm startGyroUpdates];
CMGyroHandler gyroHandler = ^ (CMGyroData *gyroData, NSError *error) {
CMRotationRate rotate = gyroData.rotationRate;
NSLog(#"rotation rate: {%6.2f, %6.2f, %6.2f}", rotate.x, rotate.y, rotate.z);
};
} else {
NSLog(#"No gyro");
[cmmm release];
}
}