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    <p>A way to create a custom timing function is by using the <strong>functionWithControlPoints::::</strong> factory method in CAMediaTimingFunction (there is a corresponding initWithControlPoints:::: init method as well). What this does is create a Bézier curve for your timing function. It is not an arbitrary curve, but Bézier curves are very powerful and flexible. It takes a little practice to get the hang of the control points. A tip: most drawing programs can create Bézier curves. Playing with those will give you a visual feedback on the curve you are representing with the control points. </p> <p>The <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Animation_Types_Timing/Articles/Timing.html">this link</a> points to apple's documentation. There is a short but useful section on how the pre-build functions are constructed from curves.</p> <p>Edit: The following code shows a simple bounce animation. For doing so, I created a composed timing function (<strong>values</strong> and <strong>timing</strong> NSArray properties) and gave each segment of the animation a different time length (<strong>keytimes</strong> property). In this way you can compose Bézier curves to compose more sophisticated timing for animations. <a href="http://watchingapple.com/2008/04/core-animation-creating-a-jack-in-the-box-with-cakeyframeanimation/">This</a> is a good article on this type of animations with a nice sample code.</p> <pre><code>- (void)viewDidLoad { UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 50.0)]; v.backgroundColor = [UIColor redColor]; CGFloat y = self.view.bounds.size.height; v.center = CGPointMake(self.view.bounds.size.width/2.0, 50.0/2.0); [self.view addSubview:v]; //[CATransaction begin]; CAKeyframeAnimation * animation; animation = [CAKeyframeAnimation animationWithKeyPath:@"position.y"]; animation.duration = 3.0; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; NSMutableArray *values = [NSMutableArray array]; NSMutableArray *timings = [NSMutableArray array]; NSMutableArray *keytimes = [NSMutableArray array]; //Start [values addObject:[NSNumber numberWithFloat:25.0]]; [timings addObject:GetTiming(kCAMediaTimingFunctionEaseIn)]; [keytimes addObject:[NSNumber numberWithFloat:0.0]]; //Drop down [values addObject:[NSNumber numberWithFloat:y]]; [timings addObject:GetTiming(kCAMediaTimingFunctionEaseOut)]; [keytimes addObject:[NSNumber numberWithFloat:0.6]]; // bounce up [values addObject:[NSNumber numberWithFloat:0.7 * y]]; [timings addObject:GetTiming(kCAMediaTimingFunctionEaseIn)]; [keytimes addObject:[NSNumber numberWithFloat:0.8]]; // fihish down [values addObject:[NSNumber numberWithFloat:y]]; [keytimes addObject:[NSNumber numberWithFloat:1.0]]; //[timings addObject:GetTiming(kCAMediaTimingFunctionEaseIn)]; animation.values = values; animation.timingFunctions = timings; animation.keyTimes = keytimes; [v.layer addAnimation:animation forKey:nil]; //[CATransaction commit]; } </code></pre>
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    1. POHow to create custom easing function with Core Animation?
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    1. COProblem is that cubic beziers are limited and it's not possible to create for instance "bounce" effects with them.
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      1. USMartin Wickman
    2. COYes that is true. You can combine multiple timing functions using the values and timingFunctions properties of CAKeyframeAnimation to achieve what you want. I'll work out an example and put the code in a bit.
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    3. COA rather long bit ... but posted the code!
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