As the comment suggests, this method is called by the Objective-C runtime after the Application is instantiated, and is ready to run.
正如注释所建议的，这个方法在Application实例化后且已经准备好运行之时，由Objective - C运行时来调用。
With dynamic linking, you can update just one C runtime library, and correct the internationalization of all seventy-nine applications.
有了动态链接，您就可以只更新一个 C 运行时库，然后修正所有 79 个应用程序的共同问题。
The Objective-C runtime will then try to load that window when your application runs, and will find your application delegate from the setting in that file.
在应用程序启动的时候，Objective-C运行时将会尝试去加载那个文件，并根据这个文件内的设置来查找应用程序委托类。
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