Download Objective-C Phrasebook by David Chisnall PDF

By David Chisnall

Objective-C Phrasebook provides the code words you want to fast and successfully entire your programming tasks with Objective-C, on structures 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 moveable pocket guide

versatile and Functional
Packed with greater than a hundred customizable code snippets–so you could with no trouble code based Objective-C in precisely approximately any situation

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Sample text

This sorts Understanding Selectors an array, using a function to define the ordering between the items. In an Objective-C version, you might want to compare objects by sending them a -compare: message, rather than by using a function pointer. Ideally, then, you’d want to pass the name of the message to send in to the method implementing the sort. The name of a message is referred to as the selector. This is an abstract representation of the message name, and it has the SEL type, which is an opaque type.

A C++ object that has virtual methods contains a (hidden) pointer to a vtable. This is a simple array of function pointers. When you call the method, the compiler dereferences the vtable pointer and calls the function at the correct offset. You cannot use the vtable to find anything out about the object, and its layout is part of the target platform’s ABI definition, not part of the language. The isa pointer is very different. It is an explicit instance variable, and therefore it’s accessible just like any other instance variable.

It must be looked up at run time. This makes superclass messages slower when sent from methods defined in categories. The Apple runtimes work around this by making the linker resolve the external class reference. The reason for the dynamic lookup is to support class posing, a technique where one class replaces the definition of another at run time. With the Modern Apple runtime, class posing is no longer supported. Every class exports its structure as a Understanding the isa Pointer public symbol, so the linker will resolve the class pointers at load time.

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