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

By Craig Hockenberry

ISBN-10: 144938840X

ISBN-13: 9781449388409

Creating iPhone Apps with Cocoa contact: The Mini lacking handbook walks you thru constructing your first iPhone App and introduces you in your programming environments and instruments: Cocoa contact, Interface Builder, Xcode, and the Objective-C programming language. in case you are a Java or C developer, this booklet is your quickly music to App improvement.

This book is tailored from components of iPhone App improvement: The lacking Manual.

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Implementation: The Brains Behind the Beauty For every @interface, there’s an @implementation. The easiest way to think about it is that @interfaces are what your class looks like from the outside, and the @implementation is what it looks like from the inside. Note: So far, you’ve been looking at what goes in an interface header file. h extension by convention. m file. Just remember that Methods go in a file that begins with the letter M. Here’s what the implementation could look like: @implementation NSString (AwesomeMethods) - (NSString *)awesomeString { NSString *awesome = [self uppercaseString]; if (!

In the case of NSString, only the most basic functions are present in the main class definition. The real meat of the class is in this category: @interface NSString (NSStringExtensionMethods) Creating iPhone Apps with Cocoa Touch: The Mini Missing Manual 47 There’s the @interface you saw earlier (page 41), followed by the class name. It’s only when you get to the parentheses that things get interesting. The parenthesized name gives you a hint as to what’s going on here. This class interface supplies methods that extend the previously defined NSString.

The –hasSuffix: method checks to make sure that there’s at least one exclamation point at the end. If not, the –stringByAppending String: method adds the necessary impact. But what does that self mean? Every method implementation is passed a hidden argument named self that references the object receiving the message. Since your method is a part of the NSString class, self refers to an instance of that class. ) Note: C++, Java, and PHP all use this to provide this self-reference. ”. Categories also help you avoid repetition in your own code.

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

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