Using NSArray as an array of images and load one at a time.

[paris]

I have an NSArray that loads 30 images when the viewloads up.

I have a UIImageView that can display only one of these images at a given time.

The user clicks on a button to see the next image.

On each click I am doing this :
--
UIImage *img = [imageArray objectAtIndex:current_img_number];
[img_view setImage:img];
--

However the app crashes on every click.

Can anyone help me please?

Thanks,
Paris.

[paris]

If you want to retain the elements in an NSArray across functions then you have to pass it the retain message.

1. So in Header file I have :
NSArray *imageArray;

2. In Implementation I have this inside "viewDidLoad()"

imageArray = [[NSArray arrayWithObjects:
[UIImage imageNamed:@"01.JPG"],
[UIImage imageNamed:@"02.JPG"],
[UIImage imageNamed:@"03.JPG"],
[UIImage imageNamed:@"04.JPG"],
nil] retain];

3. notice the retain message that gets passed to NSArray. This makes sure the objects are persistent in memory and available when "imageArray" is accessed in other functions.

4. without the retain message, the objects are released in viewDidLoad() and trying to access the array elements in another function will result in a crash.

[KyleTomson]

Originally Posted by paris

I have an NSArray that loads 30 images when the viewloads up.

I have a UIImageView that can display only one of these images at a given time.

The user clicks on a button to see the next image.

On each click I am doing this :
--
UIImage *img = [imageArray objectAtIndex:current_img_number];
[img_view setImage:img];
--

However the app crashes on every click.

Can anyone help me please?

Thanks,
Paris.

Paris - I am putting together a similar application. The counter I am using (analogous to your 'current_img_number' variable), is causing my program to crash whenever I increment it. Can you tell me how your are defining your counter and how you are incrementing it? When I initially set it, everything works. It's only after I come around a second time and increment it that the program crashes. I am getting a objc_msgSend error.

Thanks for you help.

Kyle

[eddietr]

Kyle, how are you defining and incrementing your counter? If you post that code, someone can help you fix it.

[SnehaSingh]

Originally Posted by eddietr

Kyle, how are you defining and incrementing your counter? If you post that code, someone can help you fix it.

NSArray *arrTemp = [[NSArray alloc]initWithObjects:@"1.jpg",@"2.jpg",nil];
arrayQuotes = [[NSMutableArray alloc]initWithArray:arrTemp];


use the mutable array and index no