Graphics Programs Reference
In-Depth Information
Declarations
To manage its relationships and responsibilities, the
QuizViewController
object
needs five instance variables and two methods. In this section, you will declare these in the
QuizViewController
header file,
QuizViewController.h
.
Declaring instance variables
Here are the five instance variables
QuizViewController
needs:
questions
a pointer to an
NSMutableArray
containing instances of
NSString
answers
a pointer to another
NSMutableArray
containing instances of
NSString
currentQuestionIndex
an
int
that holds the index of the current question in the
questions
array
questionField
a pointer to the
UILabel
object where the current question will be displayed
answerField
a pointer to the
UILabel
object where the current answer will be displayed
In the project navigator, select
QuizViewController.h
to open the file in the editor.
Add the following code: a set of curly brackets and, inside the brackets, the declarations for
the five instance variables. Notice the bold type? In this topic, code that you need to add is
always bold; the code that's not bold is there to tell you where to type in the new stuff.
@interface QuizViewController : UIViewController
{
int currentQuestionIndex;
