developer.apple.com 上的教程与 Xcode 项目模板之间的差异
我正在关注 developer.apple 的教程.com 学习 Cocoa，我在我的项目中发现了教程中没有的东西。就是我开始项目的时候做的Application Delegate。在他们的教程中，它在界面生成器中显示了这一点：
我在 Mac 上的文件，在界面生成器中打开，看起来像这样：
另外，我无法将 Controller 类添加到我的 xib 文件中。它给了我错误：
已解析 1 个源文件，但未找到或更改任何类。
教程是旧的还是我做错了什么？什么是 App Delegate 类？
I was following the tutorial at developer.apple.com for learning Cocoa, and I found something in my project that was not in the tutorial. It was the Application Delegate that was made when I started the project. In their tutorial it shows this in interface builder:
The file I have on my Mac, opened in Interface Builder, looks like this:
Also, I cannot add the Controller class to my xib file. It gives me the error:
Parsed 1 source file, but no classes were found or changed.
Is the tutorial old or am I doing something wrong? And what is the App Delegate class?
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该教程很旧，但为了回答您的问题，App Delegate 是一个实现 NSApplicationDelegate 协议的 NSObject。更多信息请此处。
您无需对本课程执行与您的教程相关的任何操作。当您编写更高级的程序时，您会发现应用程序委托非常有用。
The tutorial is old, but to answer your question, the App Delegate is an NSObject that implements the NSApplicationDelegate protocol. More infor here.
You don't necessary need to do anything with this class with respect to your tutorial. As you write more advanced programs you will find that the application delegate can be very useful.