Core animation for Mac OS X and the iPhone: Creating by Bill Dudney

By Bill Dudney

Mac OS X Leopard introduces a wonderful new expertise that makes writing functions with lively and cinematic consumer interfaces a lot more straightforward. we will discover this new know-how through beginning with the normal ideas you know from the pre-Leopard improvement kits.

Then we are going to see how they observe to the recent frameworks and APIs. we are going to construct in your current wisdom of Cocoa and produce you successfully up to the mark on what center Animation is all approximately.

With this booklet in hand, you could upload middle Animation in your Cocoa functions, and make wonderful person interfaces that your user's might be displaying off to their friends.

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We’ll also learn to change the duration of an animation and to follow one animation with another. The perceived speed of an animation gives subtle cues to our users about what has happened or is about to happen. Subtle clues are the ones that seem to make a deeper impression. 1 Animation Timing Curves CAMediaTimingFunction is the abstract class that defines what a timing function is. It defines four built-in timing functions and allows us to define our own custom timing functions. We will be going over all the options in this section, including how to use them and what effect they have on our animations.

We want photo2 to move to the left edge when photo1 finishes moving, so 56 C HAINING A NIMATIONS we create a new animation with the same duration and add it to photo2 and then tell photo2’s animator to move. Something to notice is that the animation for photo2 is not started if the name of the completing animation is not photo1. Using this naming scheme would allow you to use one object as the delegate for more than one animation and then distinguish them using their names. The view allows us to reset the animation with the R key; therefore, you can reset and run the animation a couple of times to make sure you fully follow what is happening.

The next thing to notice is on line 5, where we set the calculationMode property of the animation. Setting this value to kCAAnimationPaced causes the animation to equally distribute the time across the whole path. By default, a keyframe animation will distribute the 33 K EYFRAME A NIMATIONS time equally across the path fragments so each path fragment would have the same amount of time to move the view along. This makes the long path fragments move the view quickly and the short segments move the view slowly.

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