Download PDF by Craig Hockenberry: Creating iPhone Apps with Cocoa Touch: The Mini Missing

By Craig Hockenberry

ISBN-10: 144938840X

ISBN-13: 9781449388409

Growing iPhone Apps with Cocoa contact: The Mini lacking guide walks you thru constructing your first iPhone App and introduces you on your programming surroundings and instruments: Cocoa contact, Interface Builder, Xcode, and the Objective-C programming language. This e-book is tailored from components of iPhone App improvement: The lacking handbook.

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At runtime, your application will crash with an exception in objc_msgSend because the NSString class doesn’t know what to do with the message you’ve sent. Managing Memory If you take a look at your class’s accessors for exclamationCount and originalString, you’ll see some new methods being called on the instance variables. The retain, copy, and release messages are extremely important: You use them to manage the memory usage of objects. info Note: Memory is also one of the more complicated things to understand about Objective-C, so don’t get frustrated if you don’t understand it at first.

You’ll learn about these objects in detail in Chapter 3. xib. The app’s window opens to the right of the main document window and gives you the opportunity to modify the color. Start thinking about your favorite color! At the far right is the Property Inspector. You’ll use this window often as you refine your UI. Currently, it’s showing Window Attributes because you’re working with a window. The inspector is split into four main sections, which you choose from the tabs at the top. Each section lets you adjust various aspects of each object: • Attributes.

If you’re talking to a longtime C++ developer, you may hear member variables. Java diehards use fields. Whichever term is used doesn’t matter; it’s still just a block of memory that’s associated with each instance of your class. A few new methods at the end of the interface let you read and write the data managed by this new class. These methods are called accessors because they let you access the class’s internal information. By convention, the method that reads the instance variable just uses the name.

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Creating iPhone Apps with Cocoa Touch: The Mini Missing Manual by Craig Hockenberry


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