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copied!<p>To anyone struggling with this stuff like myself, modifying Karl's example, here is a simple experiment with the speech bubble drawing, moving the pointy part on its bottom length with CAMediaTimingFunction thrown in. This is basically what I wanted to do, when someone taps on a defined grid of items, the pointer moves into position to reflect tap selection.</p> <pre><code> UIBezierPath *spath = [UIBezierPath bezierPath]; [spath moveToPoint:CGPointZero]; [spath addLineToPoint:CGPointMake(320.0f, 0)]; [spath addLineToPoint:CGPointMake(320.0f, BLOCK_HEIGHT)]; // Pointy part [spath addLineToPoint:CGPointMake(20.0f + POINTER_HALF, BLOCK_HEIGHT)]; [spath addLineToPoint:CGPointMake(20.0f, BLOCK_HEIGHT + POINTER_HALF)]; [spath addLineToPoint:CGPointMake(20.0f - POINTER_HALF, BLOCK_HEIGHT)]; [spath addLineToPoint:CGPointMake(0, BLOCK_HEIGHT)]; [spath closePath]; UIBezierPath *spath2 = [UIBezierPath bezierPath]; [spath2 moveToPoint:CGPointZero]; [spath2 addLineToPoint:CGPointMake(320.0f, 0)]; [spath2 addLineToPoint:CGPointMake(320.0f, BLOCK_HEIGHT)]; // Pointy part [spath2 addLineToPoint:CGPointMake(300.0f + POINTER_HALF, BLOCK_HEIGHT)]; [spath2 addLineToPoint:CGPointMake(300.0f, BLOCK_HEIGHT + POINTER_HALF)]; [spath2 addLineToPoint:CGPointMake(300.0f - POINTER_HALF, BLOCK_HEIGHT)]; [spath2 addLineToPoint:CGPointMake(0, BLOCK_HEIGHT)]; [spath2 closePath]; CAShapeLayer *shapeLayer = [CAShapeLayer layer]; shapeLayer.bounds = CGRectMake(0.f, 0.f, 320.0f, 76.0f); shapeLayer.position = CGPointMake(160.0, 200.0); shapeLayer.fillColor = [[UIColor redColor] CGColor]; shapeLayer.path = [[UIBezierPath bezierPathWithOvalInRect:shapeLayer.bounds] CGPath]; [self.layer addSublayer:shapeLayer]; CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"path"]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.fromValue = (__bridge id)(spath.CGPath); animation.toValue = (__bridge id)(spath2.CGPath); animation.repeatCount = NSIntegerMax; animation.duration = 2.0; animation.autoreverses = YES; [shapeLayer addAnimation:animation forKey:@"shapeAnimation"]; </code></pre>

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