CATransaction unlock example in Objective C (iOS).

CATransaction unlock

Relinquishes a previously acquired transaction lock.

+ (void)unlock

CATransaction unlock example.

- (void) updateUI
{
[CATransaction lock];
[CATransaction setValue:(id)kCFBooleanTrue
                 forKey:kCATransactionDisableActions];
[CATransaction begin];
myLayer.path = [UIBezierPath bezierPathWithOvalInRect:theRect].CGPath;
myLayer.bounds = theBounds;
[CATransaction commit];

[CATransaction flush];
[CATransaction setValue:(id)kCFBooleanFalse
                 forKey:kCATransactionDisableActions];
[CATransaction unlock];
}

Example of [CATransaction unlock].

In your touch handling method, wrap the animations in a transaction and lock:

[CATransaction lock];
[CATransaction begin];

// update the sublayers with new animations

[CATransaction commit];
[CATransaction unlock];

CATransaction unlock example.

CGPathRef newPath = CGPathCreateWithRect(aLayer.frame, nil);
[CATransaction lock];
[CATransaction begin];
[CATransaction setAnimationDuration:5.0f];
CABasicAnimation *ba = [CABasicAnimation animationWithKeyPath:@"path"];
ba.autoreverses = YES;
ba.fillMode = kCAFillModeForwards;
ba.repeatCount = HUGE_VALF;
ba.fromValue = (id)aLayer.path;
ba.toValue = (__bridge id)newPath;
[aLayer addAnimation:ba forKey:@"animatePath"];
[CATransaction commit];
[CATransaction unlock];

End of CATransaction unlock example article.