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Figure 4-8. Editing a View Object s Autoresize Attributes
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The application will need to create an instance of the ScrapWordsController. It will be connected to other objects in the NIB document, so the NIB document should instantiate the controller as well. From the Library, select the Objects & Controllers group and drag a new Object object into the MainMenu.xib document window, as shown in Figure 4-9. Select the newly created object and switch to the Identity inspector (Tools Identity Inspector). Set its class to ScrapWordsController. You can type it in or choose it from the pull-down menu; Interface Builder keeps track of the classes you ve defined in your project.
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Figure 4-9. Adding a Custom Object to the NIB Document When this NIB document is loaded at runtime, it will create an instance of ScrapWordsController, just as if your application had executed the statement [ScrapWordsController new]. This is an important concept to grasp. All of the objects in a NIB document represent real objects that will be instantiated when the NIB is loaded. The result is identical to creating new instances of those objects, setting all of their properties, adding them to their container object (for nested objects), and setting references between them. But by using Interface Builder, you save yourself from writing a ton of code.
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In an MVC design, data model objects broadcast changes to view objects whenever they change. View objects update the data model object whenever the user alters the value. This requires connections and communications between the view and data model objects. This application s data model is a couple of simple values (a string and an array) created by the controller object. There are a variety of ways of connecting the data values to the view objects, but this application is going to use a binding. Bindings are actually a collection of technologies that support the MVC design pattern. A binding connects two objects so that a change in a property of one object is automatically communicated to the other object. The second object can initiate changes that alter the property of the first object. Typically, the first object is a data model object and the second object is a view object. Once bound together, changes to one are automatically reflected in the other. This doesn t require you to write any code. You need only declare the property and bind it to an object. In Interface Builder, choose the Text Field object (either in the MainMenu.xib or in the Window itself). Bring up the Bindings Inspector (Tools Bindings Inspector). Expand the text field s Value binding. Bind it to the ScrapWordsController object using a key path of letters, set it to Continuously Update Value, and uncheck the other options so they match the ones shown in Figure 4-10.
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Figure 4-10. Binding the Text Field to the letters Property of ScrapWordsController This binding is complete. Any change to the controller s letters property (i.e. [controller setLetters:@"hello"], or controller.letters = @"hello") will be immediately reflected in the text field view. Editing the text field will update the value of letters in the controller. If that seems like a lot of magic for so little code, I ll lift the curtain a little and give you a peek at some of what s going on behind the scene. The key thing to keep in mind is that Interface Builder isn t doing anything special. The technologies that allow bindings to work Key-Value Coding, Key-Value Observing, and controllers are available to you directly. They can be used individually, or in concert, to implement a wide spectrum of solutions, beyond just making MVC designs easy.
Key-Value Coding (KVC) allows an object s properties to be accessed interpretatively. It uses a combination of informal protocols (explained in 5) and introspection. As an example, assume there s a Key-Value Coding compliant Person class that has three properties: a string name property, and father and mother properties that reference two other Person objects. A person s name could be examined using the Key-Value path @"name". Their father s name could be addressed with the path @"father.name", and their maternal grandfather s name could be accessed using the path @"mother.father.name". KVC is discussed in more detail in the Introspection chapter.
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