NSMutableArray replaceObjectAtIndex

[svveet]

im trying to replace an object inside a nsmutablearrayA (self) with another nsmutablearrayB, but someone when i tried to access the nsmutablearrayB inside of my nsmutablearrayA (self), it returns nil.

i have no idea why it returns nil, here is my code.

I have a nsmutablearray, each contents one UIImage object.

NSMutableArray *tempStoredPreviewImageArray = [[NSMutableArray alloc] init];
	for (int i = 0; i < [[self videoDataArray] count]; i++) {
		[tempStoredPreviewImageArray addObject:[UIImage imageNamed:@"emptypreview2.png"]];
	}
	[self setStoredPreviewImageArray:tempStoredPreviewImageArray];
	[tempStoredPreviewImageArray release];

then i call this methods sometime in my app

[[self storedPreviewImageArray] replaceObjectAtIndex:[index row] withObject:[self arrayOfImages]];

[[self tempAnimationImages] removeAllObjects];

then i tried to read it storedPreviewImageArray

NSLog(@"%i", [[[self storedPreviewImageArray] objectAtIndex:0] count]);

then the log says

2009-09-22 03:37:26.252 xx[3091:20b] 0

why did my nsmutablearray object disappear?

[Dutch]

This line...confuses me

[[self storedPreviewImageArray] replaceObjectAtIndex:[index row] withObject:[self arrayOfImages]];

If you have an array of UIImage objects, why are you trying to replace one of the UIImage items with an array of images (arrayOfImages)?

[[self storedPreviewImageArray] replaceObjectAtIndex:[index row] withObject:[[self arrayOfImages] objectAtIndex:0]];

[svveet]

Originally Posted by Dutch

This line...confuses me

[[self storedPreviewImageArray] replaceObjectAtIndex:[index row] withObject:[self arrayOfImages]];

If you have an array of UIImage objects, why are you trying to replace one of the UIImage items with an array of images (arrayOfImages)?

[[self storedPreviewImageArray] replaceObjectAtIndex:[index row] withObject:[[self arrayOfImages] objectAtIndex:0]];

Thanks for your reply, what i am trying to do is replace an UIImage with an Array of UIimages. so i can set animationImages with an array

[Dutch]

Originally Posted by svveet

Thanks for your reply, what i am trying to do is replace an UIImage with an Array of UIimages. so i can set animationImages with an array

I didnt think you can mix and match like that, can you? If so thats pretty cool.

[Fool]

I'm sure you've tried all of this, but anyway...

Does this -

NSLog(@"%i",[arrayOfImages count];

return the number you're expecting?

And what if you try replaceObjectAtIndex:0 , rather than [index row].

Just trying to debug it.

[svveet]

Hi all,

thanks for all the feedbacks, i have managed to solved it by transforming the nsmutablearray into nsarray and then replace with nsarray instead of nsmutablearray.

NSArray *temparrayAnimationImages = [NSArray arrayWithArray:[self tempAnimationImages]];
[[self storedPreviewImageArray] replaceObjectAtIndex:[[indexPathArray objectAtIndex:0] row] withObject:temparrayAnimationImages];

then it returns the right array.

somehow you cant replace with a nsmutablearray