How do you release a shared accelerator instance on the iPhone?

问题

I have created an accelerometer variable:

UIAccelerometer   *objAccelerometer;

that I am associating to the sharedAccelerometer instance:

objAccelerometer = [UIAccelerometer sharedAccelerometer];
objAccelerometer.delegate = self;

When I release this view (to load a different view), the accelerometer instance causes the program to die. (If I have it commented out, I can switch between views without a problem).

I had a similar problem with an NSTimer, but once I called:

[myTimer invalidate];

(prior to releasing and switching the views) everything worked fine.

How should I properly release the delegate or deallocate or release the accelerometer?

回答1:

You don't release the shared accelerometer - you never retained it (and shouldn't) - it's a singleton.

The accelerometer has a reference to your object. For it to release it just set it's delegate property to nil (because it's a property it will release its reference to your object).

来源：https://stackoverflow.com/questions/740519/how-do-you-release-a-shared-accelerator-instance-on-the-iphone