Multi tool use

Rotary Wheel stopping at every 90 degree sector only iOS

I have made a rotary wheel of 26 sectors. I want the rotary wheel to stop randomly at any of the sectors whereas it is only stopping at every 90 degrees sector (on sector # 0,6,13,20). This is my code snippet.

// an ivar for your class:
BOOL animating;

- (void) spinWithOptions: (UIViewAnimationOptions) options {
// this spin completes 360 degrees every 2 seconds
[UIView animateWithDuration: 0.5f
delay: 0.0f
options: options
animations: ^{
self.imageToMove.transform = CGAffineTransformRotate(imageToMove.transform, M_PI / 2);
}
completion: ^(BOOL finished) {
if (finished) {
if (animating) {
// if flag still set, keep spinning with constant speed
[self spinWithOptions: UIViewAnimationOptionCurveLinear];
} else if (options != UIViewAnimationOptionCurveEaseOut) {
// one last spin, with deceleration
[self spinWithOptions: UIViewAnimationOptionCurveEaseOut];
}
}
}];
}

- (void) startSpin {
if (!animating) {
animating = YES;
[self spinWithOptions: UIViewAnimationOptionCurveEaseIn];
}
}

- (void) stopSpin {
// set the flag to stop spinning after one last 90 degree increment
animating = NO;
}


Please tell me how to make it stop randomly every time it spins.

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