By David Chisnall

Objective-C Phrasebook can provide the code words you want to quick and successfully entire your programming tasks with Objective-C, on platforms together with iOS and Mac OS X.

Concise and Accessible
Easy to hold and straightforward to use–lets you ditch all these cumbersome books for one transportable pocket guide

versatile and Functional
Packed with greater than a hundred customizable code snippets–so you could simply code stylish Objective-C in exactly approximately any situation

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The example at the start of this chapter will create both -integer and -setInteger: methods. integer += 42; The last case is the most useful. Expanding this to the traditional Objective-C message syntax would look like so: [obj setInteger: [obj integer] + 42]; 39 40 CHAPTER 2: An Objective-C Primer It’s worth remembering that both of these will generate precisely the same code. The first looks more efficient, but it is not. In both cases, you have two message sends and one addition. This is significantly more expensive than if obj were a C structure.

If you need to compile these on other platforms, you can find a tool in the GNUstep repository called pbxbuild, which will compile them. If you are working on some other platform, you can use GNUstep Make to build. This also works on OS X, so whichever option you choose, you should not have portability problems caused by your build system. CHAPTER 2: An Objective-C Primer 18 intended to be used with C libraries, rather than as a standalone language. Now, most Objective-C code uses something based on the NeXT Foundation framework—either Apple’s Foundation, the GNUstep Base library, or libFoundation—as a standard library.

Once you have declared a property interface, you must provide an implementation. Properties are just a way of defining accessor methods. The property a in the last example is implemented with -a and -setA: methods. The first returns the value of the property, and the second sets it to a new value. Note: The dot syntax is one of the most controversial changes that Apple has made to Objective-C. It violates one of the core principles of Objective-C—that new semantics should always use new syntax—by reusing the structure field accessor syntax for message sending.

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