Beginning iOS6 Development CH03 Handlling Basic Interaction

Handling Basic Interaction

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The Model-View-Controller Paradigm

• Model-View-Controller (MVC) is a very logical way of dividing the code that makes up a GUI-based application.

• The MVC pattern divides all functionality into three distinct categories:– Model: The classes that hold your application’s data.– View: Made up of the windows, controls, and other

elements that the user can see and interact with.– Controller: The code that binds together the model

and view. It contains the application logic that decides how to handle the user’s inputs.

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Looking at the View Controller

• The Button Fun folder should contain four source code files (the ones that end in .h or .m) and a single nib file.

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Looking at the View Controller

• The controller class called BIDViewController is responsible for managing our application’s view.

• contents of the BIDViewController header file:

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Outlets and Actions

• A controller class can refer to objects in a nib file by using a special kind of property called an outlet.

• interface objects in nib file can be set up to trigger special methods in controller class. These special methods are known as action methods.

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Outlets

• Outlets are special Objective-C class properties that are declared using the keyword IBOutlet.

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Actions

• Actions are methods that are declared with a special return type, IBAction, which tells Interface Builder that this method can be triggered by a control in a nib file.

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User Interface

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Buttons and Action Method

1) Object library

2) Round Rect Button.(Drag)

3) View (Drop)

4) Edit the button’s title.

5) Show the Assistant Editor.

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Buttons and Action Method

6) Control-dragging to source code

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Buttons and Action Method

7) Connection: Action, Name: buttonPressed, Press connect.

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Buttons and Action Method

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8) Header file should now look like this:

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Buttons and Action Method

9) Impelementation file added a method stub

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Label and Outlet

• Adding outlet to label

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Label and Outlet

• header file after adding outlet

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Action Method

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Take the title of the button

Put the title in a string

Equal the string to the label

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Application Delegate

• Objects that take responsibility for doing certain tasks on behalf of another object.

• Every iOS application has one, and only one.

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AppDelegate.h File

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AppDelegate.m File

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AppDelegate.m File

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AppDelegate.m File

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