Beginning iOS6 Development CH03 Handlling Basic Interaction

1. Handling Basic Interaction
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2. 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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3. 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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4. 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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5. 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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6. Outlets
• Outlets are special Objective-C class
properties that are declared using the
keyword IBOutlet.
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7. 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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8. User Interface
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9. 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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10. Buttons and Action Method
6) Control-dragging to source code
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11. Buttons and Action Method
7) Connection: Action, Name: buttonPressed,
Press connect.
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12. Buttons and Action Method
8) Header file should now look like this:
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13. Buttons and Action Method
9) Impelementation file added a method stub
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14. Label and Outlet
• Adding outlet to label
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15. Label and Outlet
• header file after adding outlet
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16. Action Method
Take the title of the button
Put the title in a string
Equal the string to the label
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17. 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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18. AppDelegate.h File
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19. AppDelegate.m File
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20. AppDelegate.m File
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21. AppDelegate.m File
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