[apple]UI和class的连接

lwl_ls

于 2011-04-21 15:30:00 发布

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文章标签： class apple ui reference xcode object

本文链接：https://blog.youkuaiyun.com/lwl_ls/article/details/6338807

本文介绍如何在Xcode中通过Interface Builder创建对象实例，并建立不同对象间的连接，使得一个对象能向另一个对象发送消息。具体步骤包括在xib文件中实例化类、从按钮拖拽连线到目标对象，最终实现按钮点击时调用特定方法。

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An object has no way of sending a message to another object if it doesn't have a reference to the other object.

We have now instantiated our MFAExampleClass class in Xcode into an object in our xib file. This will allow our code and our interface to communicate.

object instances themselves don't contain the code to perform the action, but the classes do.

To create the connections, press the Control key on you keyboard and use the mouse to drag from the "Set to 5"" button to the MFAExampleClass instance in the MainMenu.xib window (don't do it the other way around!).

Now the button holds a reference to our MFAExampleClass object, and will send it the setTo5:message whenever it is pressed.