Andrew Duncan's Objective-C Pocket Reference 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 method followed through Apple because the beginning for programming lower than Mac OS X, a Unix-based working approach gaining vast attractiveness between programmers and different technologists. Objective-C is straightforward 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 creation to Objective-C for the skilled programmer. as well as masking the necessities of Objective-C syntax, Andrew additionally covers vital elements of the language corresponding to reminiscence administration, the Objective-C runtime, dynamic loading, allotted items, and exception dealing with.

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The reason can be any string. In contrast with the name, it's meant to be read by people, so make it descriptive. Line 6. The user info is an instance of NSDictionary a class that provides a mapping between key-value pairs. You can use this to provide detailed information about the error. Line 7. You raise an exception by calling its raise method. Line 8. The NS_HANDLER macro ends the try block and starts the handler. Line 9. Inside the handler, the variable localException is defined. Use its name to decide what to do about it.

If your class doesn't inherit any -copyWithZone: method, implement it using +allocWithZone: and an initialization method. For example: -(id )copyWithZone:(NSZone*)zone return [[self { class] allocWithZone:zone ] init]; } In this example, you evaluate [self class] to get the receiver of the allocation message. Don't use the name of your class here. If you do, descendants won't be able to inherit this method because the kind of object it creates will be hard-wired. If your class inherits a -copyWithZone: method, you might not need to change it, for example if your class doesn't add any fields.

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. -(id)init Returns self. This is the designated initializer for Object. 47 48 -(id)copy Calls -shallowCopy then -deepen on the resulting instance, and returns the result.

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Objective-C Pocket Reference by Andrew Duncan


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