本文档提供了Objective-C编程语言的关键概念和技术细节，包括方法语法、子类中方法的重写、静态变量的使用、内存管理机制的差异、属性及其属性设置等核心主题。
Material
The Objective-C 2.0 Programming Language
Topic
Method Syntax in Objective-C: http://stackoverflow.com/questions/683211/method-syntax-in-objective-c
Overriding method in subclass: http://stackoverflow.com/questions/6858457/objective-c-overriding-method-in-subclass
Static Variable: http://stackoverflow.com/questions/1087061/objective-c-static-variables
The differences between free, dealloc, release, and autorelease: http://stackoverflow.com/questions/3335350/what-are-the-differences-between-free-dealloc-release-and-autorelease You must never send-dealloc to an object except tosuper in the object's own -dealloc method.
@property and its attributes: http://stackoverflow.com/questions/2255861/property-and-retain-assign-copy-nonatomic :
1. assign: count will not increase
2. retain: count will increase
3. copy: create another object
respondsToSelector: http://stackoverflow.com/questions/3697058/when-to-use-respondstoselector-in-objective-c
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