yoyo_zeng

摘要： 可以代替自己创建线程的有多种方法，可以管理thread或者通知或者另开进程。TechnologyDescriptionOperation objectsIntroduced in OS X v10.5, an operation object is a wrapper for a task that would normally be executed on a secondary thread. This wrapper hides the thread management aspects of performing the task, leaving you free to focus 阅读全文

摘要： When you send a message like[NSObject alloc]you are actually sending a message to the class object， and that class object needs to be an instance of the MetaClass which itself is an instance of the root meta classThe basic implementation of a class in Objective-C looks like＠interface MyClass : NSObj 阅读全文