iPhone : User option to keep the app awake

I have a count down timer that "beeps" every second it counts through AVAudioPlayer. i want to set a user option to keep the app awake through an on/off switch. i know that in order to keep the app awake you need to set [UIApplication sharedApplication].idleTimerDisabled = YES; however how would i control the YES or NO option through a switch? Also, i noticed that after keeping the app awake for more than 5 minutes the开发者_如何学JAVA audio (a beep sound in my case) is muted? Why is that and how can i avoid it?

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You need a UISwitch. Just connect it to the following method to your .m:

- (void) switchChanged:(id)sender {
    UISwitch* switch = sender;
    [UIApplication sharedApplication].idleTimerDisabled = switch.on;
}

Of course, you need to set the correct value initially:

mySwitch.on = [UIApplication sharedApplication].idleTimerDisabled;

And just for completion, you have to add the following lines to your .h and connect them in you .nib file:

@interface YourClass{
    ...
    IBOutlet UISwitch* mySwitch;
}

- (void) switchChanged:(id)sender;