Core Animation: Simplified Animation Techniques for Mac and by Marcus Zarra

By Marcus Zarra

Apple’s center Animation framework allows Mac OS X, iPhone, and iPod contact builders to create richer, extra visible applications–more simply than ever and with a ways much less code. Now, there’s a finished, example-rich, full-color connection with center Animation for skilled OS X and iPhone builders who intend to make the main of this robust framework.

 

Marcus Zarra and Matt lengthy exhibit precisely what center Animation can and can’t do, tips on how to use it so much effectively–and tips to keep away from misusing it. construction in your current wisdom of Objective-C, Cocoa, and Xcode, they current professional thoughts, insights, and downloadable code for all elements of center Animation programming, from keyframing to motion picture playback.

 

Zarra and lengthy completely evaluation similarities and adjustments among center Animation at the Mac and iPhone, assisting you write code which may simply stream among systems. in addition they current an entire bankruptcy of cutting edge concepts and confirmed “rules of thumb” for optimizing middle Animation’s real-world functionality.

 

Coverage contains:

  • Taking complete good thing about center Animation’s light-weight layers and views
  • Using keyframes to realize whole regulate over your animations
  • Creating startling results with middle Animation transforms
  • Leveraging center Image’s strong filtering features from inside center Animation
  • Playing QuickTime video clips utilizing center Animation’s QTMovieLayer
  • Using the OpenGL layer to accomplish larger regulate over motion picture playback
  • Integrating complicated Quartz Composer visualizations into your person interfaces
  • How to take advantage of helper layers to attract gradients, composite shapes, and reflect sublayers
  • Adding mouse and keyboard consumer interplay issues, and masses more…

 

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Additional resources for Core Animation: Simplified Animation Techniques for Mac and iPhone Development

Example text

In this section, we talk about some overarching principles that should guide your designs, and some suggestions of things you should animate and things you should not. Design Principles Let’s face it; developers are not designers. There are a few exceptions to that statement, but for the majority, it is a rule. If you are a designer and you take offense to that statement, be thankful for your abilities and forgive the sentiment. For the rest of us, however, here are some helpful guidelines. Keep It Simple You’ve heard this one a thousand times, but you still ignore it.

If you want to animate the property you’ve specified again, for example, you want to set this property to NO. That way, the next time you call –set on the property being animated in the animation, it will use your animation again rather than the default. 0. This means that the animation plays back at its default speed. 0, the animation plays back at twice the default speed. This in effect splits the duration in half. 0, the animation actually plays back in three seconds—half the duration specified.

It is similar, so the transition should be smooth. We also introduce you to layer rotation and how to add some content to your layer by drawing a path. Changing Values Over Time Core Animation offers a wide range of properties that you can animate. Keyframe animation is the process of changing one of these properties over time. You can think of a keyframe animation as a group of basic animations strung together and run in sequence. In the context of Core Animation, interpolation (which is analogous to tweening in film) uses the value of a property between each keyframe to calculate the starting and stopping values of the surrounding keyframes.

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