The Dynamism of Objective-C

參考http://blog.csdn.net/ibright/article/details/6862226

Objective-C有3个动态特性

1，动态类型

Dynamic typing—determining the class of an object at runtime

运行时决定对象类型

2，动态绑定

Dynamic binding—determining the method to invoke at runtime

运行时决定方法调用

3，动态加载

Dynamic loading—adding new modules to a program at runtime

运行时加载新模块