Objective C - Random XIB pick

I have already posted another question about this, but no one seemed to know how to do this.

I want my app to pick a random XIB file for me, but dont use the ones that have already been randomly picked.

So heres what i have set up as of right now, it seems to wor开发者_高级运维k, but i have to keep pressing the button over and over until it finds one that hasnt be used.

-(IBAction)continueAction:(id)sender{

random = arc4random() % 2;
if (random == 0 && usedQ2 == 0) {
    Question_2 *Q2 = [[Question_2 alloc] initWithNibName:@"Question 2" bundle:nil];

    Q2.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:Q2 animated:YES];
    [Q2 release];

}
else if (random == 1 && usedQ3 == 0) {
    Question_3 *Q3 = [[Question_3 alloc] initWithNibName:@"Question 3" bundle:nil];

    Q3.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:Q3 animated:YES];
    [Q3 release];
}


}

So as you can see i have it pick from a random number, and from their find the one that it matches.

Then you can see i have another part of my if statement that is checking to make sure it hasn't been used before.

each NIB file has its own usedQ(whatever Q it is), and when that Nib file is loaded it puts that usedQ as 1.

I think i could get by doing this, but in order to get rid of the constant button pushing, i will have to put loads of else statements with more else statements in them.

I have also tried running the

random = arc4random() % 2;

in a while statement and a for statement, i hoped that it would keep looking for a number until one that hasn't be used was found with no luck.

Any help? thanks!

• Why don't you make a mutable array and populate it with the names of all your nibs.
• Then read the count of the array and generate a random number in that range.
• Extract the nib name at that index and remove it from the array.
• repeat steps 2-3.

//Setup your list at an appropriate place 

NSMutableArray *nibs = [[NSMutableArray alloc] initWithObjects: @"One Nib", @"Another Nib", @"Last Nib", nil];

self.unusedNibs = nibs; //This should be a property you declare in your header.

[nibs release];

-(IBAction)continueAction:(id)sender{

int random = arc4random() % [self.unusedNibs count]; 

NSString *nibName = [self.unusedNibs objectAtIndex: random];

[self.unusedNibs removeObjectAtIndex: random];

//Load nib here.

}