Objects in an Array

[brian515]

Hi,

I was told in another thread that if I wanted to keep track of an indefinite number of objects (in my case labels), I should put them in an array. I tried that, but I cannot retrieve the labels from the array.

I add the labels like this.

	CGSize size = CGSizeMake(320-xCoordinate, 480-yCoordinate);
	UILabel *message = [[UILabel alloc] init];
	message.textAlignment = UITextAlignmentLeft;
	message.lineBreakMode = UILineBreakModeWordWrap;
	message.numberOfLines = 100;
	message.font = [UIFont fontWithName:fontName size:fontSize];
	message.textColor = colorForText;
	message.backgroundColor = [UIColor clearColor];
	message.text = messageField.text;
	CGSize stringSize = [message.text sizeWithFont:message.font constrainedToSize:size lineBreakMode:message.lineBreakMode];
	message.frame = CGRectMake(xCoordinate, yCoordinate, stringSize.width, stringSize.height);
	[self addSubview:message];
	[self sendSubviewToBack:message];
	[textArray addObject:message];
	[message release];

And if I want to remove one, say the last one added, I do this.

[[textArray lastObject] removeFromSuperview];
[textArray removeLastObject];

But it does not work. Please help! Thanks!

[brandon0104]

Are you using an NSArray or an NSMutableArray? NSArray doesn't support any of the methods you're calling.

[brian515]

Originally Posted by brandon0104

Are you using an NSArray or an NSMutableArray? NSArray doesn't support any of the methods you're calling.

No, I am using an NSMutable Array

[eddietr]

Define "does not work", please. That could mean a lot of different things.

[brian515]

Originally Posted by eddietr

Define "does not work", please. That could mean a lot of different things.

It seems that the Array is not retrieving the labels, and therefore does not remove them from the view.

[eddietr]

Originally Posted by brian515

It seems that the Array is not retrieving the labels, and therefore does not remove them from the view.

At that point in your code, did you check that the array contains your labels?

You can check this in the debugger. Or just print the size of the array or something just to make the array has in it what you are expecting at that point.

[brian515]

Originally Posted by eddietr

At that point in your code, did you check that the array contains your labels?

No, how would I do that?

[eddietr]

Originally Posted by brian515

No, how would I do that?

Sorry, I edited my post just as you were asking that.

[brian515]

No, they are not there. That is strange. I should technically be able to do this, right?

[brian515]

Originally Posted by brian515

No, they are not there. That is strange. I should technically be able to do this, right?

Whoops. Solved it! I forgot to allocate the array. Sorry!

[eddietr]

Originally Posted by brian515

No, they are not there. That is strange. I should technically be able to do this, right?

Yes, you should be able to do this. So somewhere between creating your array an adding these labels and then when you go looking for these labels, you've lost something.

EDIT: OK, posted at the same time again. Looks like you figured it out.