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

By Marcus Zarra

Apple’s middle Animation framework permits Mac OS X, iPhone, and iPod contact builders to create richer, extra visible applications–more simply than ever and with some distance much less code. Now, there’s a entire, example-rich, full-color connection with center Animation for knowledgeable OS X and iPhone builders who have the desire to make the main of this strong framework.

 

Marcus Zarra and Matt lengthy display precisely what center Animation can and can’t do, tips to use it such a lot effectively–and the way to keep away from misusing it. construction in your current wisdom of Objective-C, Cocoa, and Xcode, they current specialist options, insights, and downloadable code for all points of middle Animation programming, from keyframing to motion picture playback.

 

Zarra and lengthy completely evaluate similarities and variations among center Animation at the Mac and iPhone, assisting you write code that may simply flow among systems. in addition they current a whole bankruptcy of leading edge options and confirmed “rules of thumb” for optimizing middle Animation’s real-world functionality.

 

Coverage comprises:

  • Taking complete benefit of center Animation’s light-weight layers and views
  • Using keyframes to realize entire regulate over your animations
  • Creating startling results with center Animation transforms
  • Leveraging middle Image’s robust filtering functions from inside of center Animation
  • Playing QuickTime videos utilizing center Animation’s QTMovieLayer
  • Using the OpenGL layer to accomplish larger keep watch over over motion picture playback
  • Integrating complicated Quartz Composer visualizations into your consumer interfaces
  • How to take advantage of helper layers to attract gradients, composite shapes, and mirror sublayers
  • Adding mouse and keyboard person interplay issues, and lots more and plenty more…

 

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

Example text

As film animation moved to computers, this concept of filling in between the keyframes has remained a necessary part of creating smooth animations using a process called tweening. Core Animation is no different. You specify the keyframes in your animation, and Core Animation handles the tweening process for you. It calculates what needs to be done in between each keyframe based on the property you have specified in your animation and interpolates all the intermediary values. It’s quite convenient and makes animation coding tasks much simpler.

Preparing a View to Perform Layer Animation that enables you to create animations that are as simple as you like or as complex as you need. To perform simple animations on windows and views, Apple provides the animation proxy object that, when called, causes an implicit animation to play when some visual component such as the view frame, opacity, or location is changed. For basic layer animation, the CABasicAnimation class provides a way to animate between two values, a starting value and an ending value.

The Animation Proxy Object So what is the animator proxy object? The animator proxy object is available in both NSView and NSWindow. It implements the protocol NSAnimatablePropertyContainer. This container uses Key-Value Coding to set the actual value of whatever parameter was specified while doing the value interpolation and animation behind the scenes. As the name implies, the animator proxy acts as an agent that takes the value you give it and handles animating the property from the starting or current value to the value specified.

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