Using a array from another class

[jhyde01]

Hello. I need some help passing an array to another class for use. To keep it simple ill only give 2 of my classes, but just in case more coding is needed, this array is going to be used for around 50 classes.

So i have HowToPlay.h (which of course has a .m) the array is set up in HowToPlay.

Then i also have another class called Question 1.h (of course has a .m). This class is a subClass of HowToPlay, and i have also imported HowToPlay into this class.

Now let me explain a bit about this array. This array is being used to select a random NIB file, and then if the NIB has already been used before it deletes it from the array.

The array itself looks like this (this is in HowToPlay)

nibs = [[NSMutableArray alloc]initWithObjects:@"Question 2", @"Question 3", nil];
	self.unusedNibs = nibs;
	[nibs release];

Hopefully your not confused when you see the Question 2 and Question 3, just ignore them, their irrelevant.

Now lets jump into Question 1,

Inside Question 1 I have a IBAction that uses this array, it looks something like this

-(IBAction)continueAction:(id)sender{

	random = arc4random() % [self.unusedNibs count];
	NSString *nibName = [self.unusedNibs objectAtIndex: random];
	[self.unusedNibs removeObjectAtIndex: random];


	if (nibName == @"Question 3") {

	Question_3 *Q3 = [[Question_3 alloc] initWithNibName:@"Question 3" bundle:nil];
	
	Q3.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
	[self presentModalViewController:Q3 animated:YES];
	[Q3 release];
	}

	if (nibName == @"Question 2") {

	Question_2 *Q2 = [[Question_2 alloc] initWithNibName:@"Question 2" bundle:nil];
	
	Q2.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
	[self presentModalViewController:Q2 animated:YES];
	[Q2 release];
	}
}

Again the Question 2 and Question 3 parts of this code are irrelevant. So as you can see the code picks a random NIB to load, then deletes it from the array. The problem is, its not deleting it from the array.

I think the array isnt be passed to the other class. Any Ideas?
The app runs fine, but it still loads those NIBs that should have been deleted out of the array.

Thanks,
Jacob

[dany_dev]

I haven't read all, however the first thing that is not ok is for sure that

if (nibName == @"Question 3") {

should be

if ([nibName isEqualToString:@"Question 3"]) {

because == in an object compare pointers

[Duncan C]

Originally Posted by jhyde01

Hello. I need some help passing an array to another class for use. To keep it simple ill only give 2 of my classes, but just in case more coding is needed, this array is going to be used for around 50 classes.

So i have HowToPlay.h (which of course has a .m) the array is set up in HowToPlay.

Then i also have another class called Question 1.h (of course has a .m). This class is a subClass of HowToPlay, and i have also imported HowToPlay into this class.

Now let me explain a bit about this array. This array is being used to select a random NIB file, and then if the NIB has already been used before it deletes it from the array.

The array itself looks like this (this is in HowToPlay)

nibs = [[NSMutableArray alloc]initWithObjects:@"Question 2", @"Question 3", nil];
	self.unusedNibs = nibs;
	[nibs release];

Hopefully your not confused when you see the Question 2 and Question 3, just ignore them, their irrelevant.

Now lets jump into Question 1,

Inside Question 1 I have a IBAction that uses this array, it looks something like this

-(IBAction)continueAction:(id)sender{

	random = arc4random() % [self.unusedNibs count];
	NSString *nibName = [self.unusedNibs objectAtIndex: random];
	[self.unusedNibs removeObjectAtIndex: random];


	if (nibName == @"Question 3") {

	Question_3 *Q3 = [[Question_3 alloc] initWithNibName:@"Question 3" bundle:nil];
	
	Q3.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
	[self presentModalViewController:Q3 animated:YES];
	[Q3 release];
	}

	if (nibName == @"Question 2") {

	Question_2 *Q2 = [[Question_2 alloc] initWithNibName:@"Question 2" bundle:nil];
	
	Q2.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
	[self presentModalViewController:Q2 animated:YES];
	[Q2 release];
	}
}

Again the Question 2 and Question 3 parts of this code are irrelevant. So as you can see the code picks a random NIB to load, then deletes it from the array. The problem is, its not deleting it from the array.

I think the array isnt be passed to the other class. Any Ideas?
The app runs fine, but it still loads those NIBs that should have been deleted out of the array.

Thanks,
Jacob

It sounds like you have a single array that is used throughout multiple objects in your app.

If there are any objects in your app design where the app creates one and only one instance, and that object persists throughout the app, use that object to hold the array. Add a property and refer to the array through the property.

For example, if your app is a game, and you have a game controller object that runs the flow of the game, you might put the nibArray into the game controller, and make it a property of the game controller.

Then, all your objects can refer to the array in the game controller:

[gameController.nibArray count]

Then the problem becomes making sure that all the different objects in your app have a pointer to your central object (the gameController in my example.)

The cleanest way to do this is to implement a data container singleton object. Take a look at the password generator tutorial in my signature. That tutorial explains how to use a data container singleton to share data across your entire app in a clean, maintainable way.

[jhyde01]

Thank You guys for your answers! Very much appreciated.

When you are talking about objects, are you meaning a class that has each Question as a subclass? Through the class HowToPlay, i have that class initialize the variable score, which is passed though the whole app, that seems to work.

Last night while going to bed I had a though, I have the array set up in the viewDidLoad part of HowToPlay, Maybe that was a bad idea to put it their, maybe I should make a separate method for it?