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Not all applications use all elements, but you should be aware of the different options. indd 20 8/31/10 2:42 PM Chapter 2: Think Cocoa! 21 The spacing of elements within windows is also standardized. Standards for margins, positioning, grouping, and justification are listed in the Apple Human Interface Guidelines. 1, are weighted so that they appear centered in the window, but aren’t simply center-justified in a mechanical way. Fonts are partly standardized. Most applications use the system font, but you can allow users to select other fonts in certain circumstances.

It’s not unusual to use Cocoa to create a user interface, Core Graphics to draw dynamic elements in the interface, and Core Animation to animate the graphics. There is also some duplication between layers; for example, you can play sound using the Core Audio or Audio Toolbox layers. This may seem redundant, but these layers offer different features. Audio Toolbox implements simple file player objects with limited features, while Core Audio includes more complex objects that are more difficult to work with, but can be used for more challenging applications such as real-time sound synthesis.

But these mixed applications are still considered “Cocoa applications,” as long as they create a Cocoa look and feel, and are organized around interacting objects and events. NOTE This book concentrates on Cocoa, but introduces key elements from other libraries. Even though technically they are not included in Cocoa, it’s difficult to develop Cocoa applications without being familiar with them. indd 8 8/31/10 2:42 PM Chapter 1: Introducing Cocoa 9 Profiting from Cocoa Developers can learn Cocoa for both fun and profit.

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