Adding UIImageView array objects to NSMutableArray

Question

I am having trouble either adding or accessing UIImageView objects to an NSMutableArray.

NSMutableArray *imageViewArray = [[NSMutableArray alloc] init];

for(int i=0;i<(imageStringArray.count);i++){
        [imageViewArray addObject:ImgArray[i]];
}

The ImgArray[x] is filled with 14 images from a URL. I either get exc_bad_access code 1 or a break point.

The reason I want to do this is to get an array of images from the web in a background thread and set the UI Images in the main thread.

EDIT:

on a seperate note, the reason I want to do this is to get and display images from a URL asynchronously.

Here is my code, but I don't know how I could make it into an async method.

-(void)getSlideshow{

    [self populateStringArray];
    NSString *prefix = @"http://newsongbismarck.com/images/announcements/";
    NSString *suffix = @".jpg";

    //NSUInteger count = [imageStringArray count];
    //get this from the website for now
    int number = (int)[imageStringArray count];
    int PageCount = number;

    //Setup scroll view
    UIScrollView *Scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 265, 320, 200)];
    Scroller.backgroundColor = [UIColor clearColor];
    Scroller.pagingEnabled = YES;
    Scroller.contentSize = CGSizeMake(PageCount * Scroller.bounds.size.width, Scroller.bounds.size.height);

    //Setup Each View Size
    CGRect ViewSize = Scroller.bounds;


    int x = PageCount;
    int numb = 0;

    UIImageView *ImgArray[PageCount];


    while(x!=0){
        ImgArray[numb] = [[UIImageView alloc] initWithFrame:ViewSize];
        [ImgArray[numb] setImage:[self getSlideshowImages:[[prefix stringByAppendingString:imageStringArray[numb]]stringByAppendingString:suffix]]];
        //[Scroller addSubview:ImgArray[numb]];

        //Offset View Size
        ViewSize = CGRectOffset(ViewSize, Scroller.bounds.size.width, 0);

        x--;
        numb++;
    }

    int integer = (int)[imageStringArray count];
    imageViewArray = [[NSMutableArray alloc] initWithCapacity:integer];

    /*int x2 = PageCount;
    int numb2 = 0;

    while(x2!=0){

        [imageViewArray addObject:ImgArray[numb2]];
        NSLog(@"ImageView added to array");
        x2--;
        numb2++;
    }
*/

    CGRect newViewSize = Scroller.bounds;
    int NumberOfImages = 21;
    int i;
    for(i=0;i<NumberOfImages;i++){

        if(i == 0){
            //Setup first picture
            UIImageView *ImgView = [[UIImageView alloc] initWithFrame:newViewSize];
            NSString *FilePath = [NSString stringWithFormat:@"Page_%d.png", i];
            [ImgView setImage:[UIImage imageNamed:FilePath]];
            [Scroller addSubview:ImgView];
        }else{
            //Setup the rest of the pictures
            newViewSize = CGRectOffset(ViewSize, Scroller.bounds.size.width, 0);
            UIImageView *ImgView = [[UIImageView alloc] initWithFrame:newViewSize];
            NSString *FilePath = [NSString stringWithFormat:@"Page_%d.png", i];
            [ImgView setImage:[UIImage imageNamed:FilePath]];
            [Scroller addSubview:ImgView];
        }
    }

[self.view addSubview:Scroller];

}

It all works if I don't try to make it async

And you're sure the objects in ImgArray are UIImageView objects? And they have strong references somewhere so they don't go "poof"? — Hot Licks
– Hot Licks, Commented Jul 26, 2014 at 18:20
why are you not using the same array, you have imageStringArray and ImgArray thats a little dangerous — meda
– meda, Commented Jul 26, 2014 at 18:22
Are you 100% certain ImgArray truly has 14 objects in them? And are you certain that imageStringArray.count <= ImgArray.count? If imageStringArray.count > ImgArray.count, it will be out of bounds. You should really but in tests like if (ImgArray.count > i) to ensure you don't go out of bounds. You also do need to indicate when you get the EXC_BAD_ACCESSS. Inside our outside of the loop? — Mobile Ben
– Mobile Ben, Commented Jul 26, 2014 at 18:30
The exc bad access is within the loop and I am certain that the ImgArray has 14 images. The imagestringarray only holds string values while the ImgArray holds UIImageViews. I'll try all these suggestions and see if it works. — Levi Barker
– Levi Barker, Commented Jul 26, 2014 at 19:28

Germo · Accepted Answer · 2014-07-26 19:42:48Z

0

Why don't you use

 - (void)addObjectsFromArray:(NSArray *)otherArray

?

answered Jul 26, 2014 at 19:42

Germo

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