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So far I ve discussed MVC communications in a generic way, but the Cocoa framework defines a very specific form of MVC communications called a binding. A binding defines a relationship between two properties in different objects. A binding forms a connection that binds one property of an observer object to a property of another object. A binding keeps the two properties synchronized. Cocoa provides a framework and an informal bindings communication protocol that does this for you. These can be any two objects, but the observer is invariably a view object and the observed property will be in a data model or controller object.
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CHAPTER 20 MODEL-VIEW-CONTROLLER PATTERN
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Note As of this writing, the iPhone OS does not support the Cocoa bindings technology. If you re targeting the
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iPhone OS, you ll have to use Objective-C messages, actions, outlets, Key-Value Observing, notifications, or other techniques to implement your MVC communications. Actions are outlets are described in the Interface Builder section.
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In practice, a view object displays the value of the property. Editing the value in the view sends messages, via the binding, to the data model to alter its value. Any change to the data model s value notifies the view. Bindings have the following attributes: Properties are identified using Key-Value paths. Both objects must implement Key-Value Coding compliant properties. The observer object listens for changes to the property value using Key-Value Observing. The bound property must be KVO compliant. NSController objects are designed to work with bindings. Specifically, NSController objects can bind compound values such as sets and arrays. NSController also defines the concept of a selection, so you can bind a property to the selected value(s) of a compound property. A binding can specify when an edited value is committed and when changes to the bound property are updated. A binding can provide a default value to use when the bound property is nil. A binding can be filtered through a value transformer that converts a bound value to a form suitable for use by the observer, and vice versa. For example, a transformer might automatically convert between currencies or change centigrade to Fahrenheit. Bindings can be created programmatically, but that s rare. Even more unusual is creating your own classes that actively participate in a binding; most of the classes that you d ever want to bind to (the NSView objects provided by the Cocoa framework) and objects with complex bindable properties (subclasses of NSController) have already been implemented for you. Most of the time you establish a binding in Interface Builder from a library view object property to either a KVO-compliant property of any object or to a subclass of NSController none of which involves any serious programming. You might want to create your own subclass of NSController or NSObjectController, but the base class is already a Cocoa bindings compatible class, so you still won t get too involved in the mechanics of bindings. If you find you need explore these options, refer to the Cocoa Bindings Programming Topics guide. 1 The vast majority of the time, you bind views to properties of your own objects and the only prerequisite is that they be Key-Value Observing compliant which most properties are, or else they can easily be made KVO compliant with a small amount of work. See 19 if you need to make sure. So far I ve focused on viewing the value of a property, but bindings are useful for many other kinds of properties. A view object, like a check box control, has many properties: the button s title, the font of the title, the state of the check box, whether it s enabled, whether it s visible, and so on. Any of these properties can be bound to a property of another object. Take the TicTacToe project as an example. The interface has a Reset button that clears the board and starts a new game. The enabled
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1 Apple Inc., Cocoa Bindings Programming Topics, http://developer.apple.com/documentation/ Cocoa/Conceptual/CocoaBindings/, 2009.
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