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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运行时加载新模块如何理解Objective-C的3这个动态特性呢？首先，动态类型，简单点说就是 id 类型，可以理解为通用对象类型，一旦被 Read More