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什么是id,与void *的区别 id在Objective C中是一个类型,一个complier所认可的Objective C类型,跟void *是不一样的,比如一个 id userName, 和void *pUserName,[userName print] 是可以的,但[pUserName print] 在编译时就会报错,因为ObjeciveC的编译器看到id,会假定它可以接受任何message,虽然在runtime时可能并不是这样的,但pUserName并不是Objective C类型,编…
oc Short list of some of the major differences: C++ allows multiple inheritance, Objective-C doesn't.一个允许多继承,一个不允许Unlike C++, Objective-C allows method parameters to be named and the method signature includes only the names and types of the parameter…
1. The behavior of objects in the real world is more complex than simply being in one state at a time. the conditions of an Object being in more than one state at a  time is called "concurrency" or concurrent states. CSE-307-Software-Engineering…
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Objective -C Categories  The dynamic runtime dispatch mechanism employed by Objective-C lets you add methods to existing classes. 被Objective -C 采纳的动态运行分配机制让你可以在已有的类中添加方法. 1.1 Creating a Category 创建一个Category  A category is a way to add new methods to…
Objective -C Object initialization 对象初始化 1.1 Allocating Objects  分配对象 Allocation is the process by which a new object is born. allocation 是新对象诞生的过程. Sending the alloc message to a class causes that class to allocate a chunk of memory large enough to…
Objective -C Memory Management  内存管理  第一部分 Memory management is part of a more general problem in programming called resource management. 内存管理是资源管理的一部分. Every computer system has finite resources for your program to use. These include memory, open fi…
Objective - c  Foundation 框架详解2 Collection Agency Cocoa provides a number of collection classes such as NSArray and NSDictionary whose instances exist just to hold onto other objects. cocoa 提供了一系列的集合类,例如,NSarray,NSdictionary.它们存在的目的就是为了保持其他对象. 1.1.1N…