Question

I need to keep track of some image views which can be dragged around the screen and located within other images views. For example footballs in goals. I’d like to do this by having some extra properties attached to the footballs, current goal and times seen in the goal.

@property (nonatomic, retain) IBOutlet IBOutletCollection(UIImageView) 
    NSArray *multipleFootballs;

I figure, that I have to create a super class.
Although I’m not sure the best way to do this ?

EDIT3 : Thanks nick, but how do I then access a instance property ?

@interface FootballImageView : UIImageView {
    int intCurrentGoal;
}
@property (readwrite) int intCurrentGoal;

@implementation FootballImageView
@synthesize intCurrentGoal;

-(id)init {

    self = [super init];
    if(self) {
        // do your initialization here...
    }
    return self; 
}

@end

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
for (id football in multipleFootballs) {

    //if ([[touches anyObject] intCurrentGoal] == 0) {
    //if (football.intCurrentGoal == 0) {

Answer 1

Should be easy:

• Create a new subclass inheriting from UIImageView, let’s call it MyImageView
• Add your custom instance variables you need to the header
• Choose as class for the old UIImageViews the new MyImageView in interface builder (Identity Tab)
• Change IBOutletCollection(UIImageView) to IBOutletCollection(MyImageView)

–

- (id)init 
{
    self = [super init];
    if(self) {
        // do your initialization here...
    }
    return self; 
}

Reply for edit 3

The problem you are facing is the anonymous type (id) you are using in touchesBegan. Put in a check like this:

for (FootballImageView *football in multipleFootballs) {
    if(football.intCurrentGoal == 0) {
        football.intCurrentGoal++;
    } 
}