Making UIAccelerometer work more than once when switching views

I need help with a problem and not sure how to fix it. Basically I have a view which switches to another view by using the accelerometer, the problem is it only works once. When I go back to the first view, the accelerometer won't work again until i rebuild the project.

This is the method I use:

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {     
float aX = ABS(acceleration.x);
float aY = ABS(acceleration.y);
float aZ = ABS(acceleration.z);
if(sqrt(aX*aX+aY*aY+aZ*aZ)&g开发者_StackOverflowt;1.5f)
{
    SecondViewController *screen = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    //screen.words = self.easy;
    [self presentModalViewController:screen animated:YES];
    [screen release];
self.accelerometer.delegate = nil;  
}

Any kind of help would be much appreciated.

---

You could set up a BOOL to temporarily disable the accelerometer handling when you present the new view controller and avoid calling self.accelerometer.delegate = nil

Once the modal transition is done, you can re-enable the accelerometer handling

Edit - Example:

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {     

if(accelerometerEnabled) {

     //... the accelerometer data handling goes here
}

Also, it looks like I did not understand all of the question originally - you'll also need to reset the accelerometer delagate to whatever view controller you want to use to handle the acceleration data. That (second) view controller will have to have the -(void)accelerometer delegate method also.

Alternatively, you could handle the acceleration data in a root view controller and make your views subviews of that root view. That would be cleaner, as you would never have to change which controller is handling the acceleration.