How to notice a quick forward motion with didAccelerate deprecated?

Question

What i want to do is read the acceleration.y and do something like:

if (acceleration.y > 0.8) {
   // Do something
}

As didAccelerate is deprecated I wonder how to get the y-value:

motionManager = [[[CMMotionManager alloc] init] autorelease];
motionManager.accelerometerUpdateInterval = kUpdateInterval;

if (motionManager.accelerometerAvailable) {
    [motionManager startAccelerometerUpdates];
}
else {
    //this device doesn't have accelerometer notice somewhere??
}

- (void)startAccelerometerUpdates {
 // READ Y-VALUE?????
}

I want to use raw accelerometer data so the app also works on 3GS. Is it possible to read the Y-value?

Answer 1

EDIT: the answer below is deprecated, check these posts for the right way.

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Old answer:

Use a UIAccelerometer singleton instance for this, for example in your AppDelegate

//in your launching method
    UIAccelerometer * accel = [UIAccelerometer sharedAccelerometer];
    accel.delegate = self;

//delegate method:
-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
    // use the y-property of the acceleration
}