Question

Ok, i made a small application with a small ball bouncing on the screen. That was esay.
Now i’d like to have more than one ball… so i think the best way is to create a new class : the ball.

How can i do it?

Thanks!

Answer 1

encapsulate the information about the ball from your first app into variables, and create methods for any actions you think the ball performs. This sounds a lot like an object-oriented design problem..perhaps you should take a look at an Object Oriented Programming guide, such as this one OOP Guide

but if you are asking how to create a custom object class..
put this in your Ball.h:

#import <Foundation/Foundation.h>

@interface Ball : NSObject {

    IBOutlet UIButton *button; //sample instance variable
}

@property  (retain) UIButton *button;
@end

then in your .m file:

#import "Ball.h"

@implementation Ball
@synthesize button;

-(void)dealloc
{
[button release];
[super dealloc];
}

@end