Objective-C Pocket Reference by Andrew Duncan PDF

By Andrew Duncan

ISBN-10: 0596004230

ISBN-13: 9780596004231

Objective-C is an exhilarating and dynamic method of C-based object-oriented programming. it is the strategy followed by way of Apple because the beginning for programming below Mac OS X, a Unix-based working process gaining vast popularity between programmers and different technologists. Objective-C is straightforward to benefit and has an easy splendor that may be a welcome breath of clean air after the abstruse and complicated C++. during this pocket reference, Andrew M. Duncan presents a short and concise advent to Objective-C for the skilled programmer. as well as protecting the necessities of Objective-C syntax, Andrew additionally covers very important points of the language akin to reminiscence administration, the Objective-C runtime, dynamic loading, dispensed gadgets, and exception dealing with.

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Isa is the name used in Darwin. This design allows class method invocation and lookup to proceed exactly the same way as for instance methods. Class objects stand on an equal footing with other objects in Objective-C: you can assign them to variables declared as id, send messages to them, and they inherit (class) methods from their ancestors. The runtime relation between classes and their metaclasses is illustrated in Figure 1-2. Figure 1-2. Classes and their metaclasses Metaclass objects are identical in structure to class objects.

30 31 The remote messaging keywords can be grouped into three categories: those for pointer parameters, those for return values, and those for object qualifiers. 1 Pointer Parameter Qualifiers This section discusses qualifiers that generally apply to pointer arguments. They tell the compiler how to handle copying values between address spaces so that the pointers can be dereferenced in both spaces and see the same value. The pointer parameter qualifiers are as follows: in You will reading directly from the parameter, or will dereference the parameter to read a value but not to write one.

You should never use the C functions malloc( ) and free( ) to manage Objective-C objects. 7 discusses how to use these methods. +(id)new Calls +alloc on the class, then -init on the resulting instance, and returns the result. +(id)alloc Allocates, clears, and returns a pointer to memory for a new instance of the receiver. Returns nil on failure. +(id)initialize Returns self. The runtime calls this method before any instances of the receiving class are created. Override to perform class-specific setup.

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Objective-C Pocket Reference by Andrew Duncan


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