iPhone SDK 3 Programming: Advanced Mobile Development for by Maher Ali

By Maher Ali

Get the professional suggestions you want to start development local purposes for Apple's new iPhone 3G in addition to the iPod Touch

Apple's iPhone is the most well liked cellular gadget in the world. a couple of million iPhone 3G telephones have been bought within the first 3 days of unlock and thousands extra are bound to be within the fingers of iPhone lovers every year. Apple's iPhone SDK has been up-to-date and comprises multiple thousand new APIs that builders should want to get their arms on.

iPhone SDK three Programming indicates you ways to construct nice purposes for the iPhone and iPod contact. inside of, veteran cellular developer and Bell Labs scientist Maher Ali starts with a foundational advent to Objective-C and Cocoa programming, after which publications you thru construction courses with Apple's iPhone SDK 3.

  • Covers the whole program improvement approach, and highlights the entire key gadget beneficial properties together with the digital camera, situation know-how, and more
  • Completely revised and redesigned with greater than a hundred new pages of content
  • iPhone's new SDK liberate comprises a couple of thousand new APIs you'll want to use correct away
  • Includes a centred creation to the Objective-C language and Cocoa frameworks that new iPhone builders need

With this complex resource, you will get the professional tips you must commence development local purposes for Apple's new iPhone 3G in addition to the iPod Touch.

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Extra resources for iPhone SDK 3 Programming: Advanced Mobile Development for Apple iPhone and iPod touch

Example text

If you use the name of a class without accessing its methods or instance variables, you can just use the @class directive. This gives the compiler enough information to successfully compile the code. Usually the @class directive is used in class declarations. For example, consider the following declaration: @class Address; @interface Person{ Address *address; } @end Here, we have a Person class declaration that uses the Address class. The compiler only needs to know that the Address is a class type.

You do that by sending that object a conformsToProtocol: message. For example, to test that a given country, aCountry, can be sued, you write: if([aCountry conformsToProtocol:@protocol(Litigating)]){ [aCountry getSuedBy:self]; else [self letItGo]; } The conformsToProtocol: method is defined in NSObject twice, once as a class method (with a “+” sign) and another as an instance method (with a “–” sign). Both are identical and are provided for convenience. For example, the class version is defined as: + (BOOL)conformsToProtocol:(Protocol *)aProtocol It takes one argument: a protocol object.

Let’s first add this method in My_ProjectAppDelegate class. h file, add the following before @end. m file, add the buttonTapped method body. 1. 1 The application delegate class after adding a new method. text = @"Hello iPhone"; } - (void)dealloc { [window release]; [super dealloc]; } @end The buttonTapped method simply obtains a reference to the label and changes its text to either “Hello World” or “Hello iPhone”. You don’t need to understand this code at this stage. All you need to understand is that the label on the screen is encapsulated by the UILabel class and it’s tagged with the number 55.

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