Just being random.

Generating random numbers is easy. If you want random numbers that are new each time use:
arc4random();

to set a start and range:
#define RANDOM_START 10
#define RANDOM_RANGE 20
#define randomNumber() ((arc4random() % RANDOM_RANGE) + RANDOM_START)

this will give random numbers from 10 through 29. 20 numbers starting at 10.

OR

#define randomNumber(s, r) (arc4random() % (r) +(s))

Note that a range of 5 will give 5 numbers, not 0 - 5 but 0 - 4

Good Vibrations

Add vibration with this easy 'C' call:

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

exit by animation

In games for the iPhone, processing level to level can be tricky

Here is a way to leave the level - in this case a bonus level.

The playing screen - attached to a UIView called: backgroundView is faded and then removed.

This is nice because the fading looks good, its OS supported and releases managed views automatically.

// called by the animation thread when animation is finished

- (void)bonusExitFinished:(NSString *)animationID finished:(BOOL)finished context:(void *)context

{

NSLog(@"Bonus Exit Finished");

// the subviews are all released automatically when backgroundView removes itself

[backgroundView removeFromSuperview];

// use a delegate to tell the owner that this round is finished

[delegate roundFinished];

}

// call this at the end of the level: [self exitBonus];

// backgroundView is the UIView that contains all of the subviews

- (void) exitBonus

{

NSLog(@"Bonus Exit");

//pause / slowly fade the screen

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration: 1.8f];

[backgroundView setAlpha: 0.0f];

[UIView setAnimationDelegate: self];

[UIView setAnimationDidStopSelector: @selector(bonusExitFinished:finished:context:)];

[UIView commitAnimations];

}