New PDF release: Objective-C Pocket Reference

By Andrew Duncan

Objective-C is a thrilling and dynamic method of C-based object-oriented programming. it is the method followed via Apple because the starting place for programming below Mac OS X, a Unix-based working method gaining vast reputation between programmers and different technologists. Objective-C is simple to benefit and has an easy beauty that may be a welcome breath of unpolluted air after the abstruse and complicated C++. during this pocket reference, Andrew M. Duncan offers a short and concise advent to Objective-C for the skilled programmer. as well as masking the necessities of Objective-C syntax, Andrew additionally covers very important elements of the language reminiscent of reminiscence administration, the Objective-C runtime, dynamic loading, dispensed gadgets, and exception dealing with.

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The root classes provide a basic framework of copy methods, but your classes will have to override them to get proper deep copying. 1 Calling copy methods The copy methods of Object all return a shallow copy of the receiver. For Object itself, the distinction between deep and shallow is meaningless, since the only pointer it has is the isa pointer, which is supposed 36 37 to be shared between all instances. In descendant classes that properly override the methods, their behavior will be as follows: -(id)copy Returns a deep copy of the receiver.

If two objects are equal (as reported by the -isEqual: method) they will have the same hash value. However, two unequal objects may also share the same hash value. (NSObject protocol) -(BOOL)isEqual:(id)object Returns YES if the receiver and object are equal as pointers, otherwise returns NO. Override to provide different semantics, such as equality of contents. (NSObject protocol) +(Class)class Returns the class object that represents the receiver, not (as you might expect) the metaclass object of the metaclass of the receiver.

All initializers return id. This class has a simple -init method, taking no parameters. It calls (funnels to) -initWithI: passing in a default value. Line 5. Parent provides another initializer, initWithI:, which lets you specify the value of the field i. This is the designated initializer. Line 11. MyClass overrides (covers) its parent's designated initializer. Always do this in your classes. If you don't cover a parent's designated initializer, code such as: MyClass* obj = [[MyClass alloc] initWithI:42]; will go straight to the parent class's initializer and leave j undefined.

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