iOS UIScrollView not scrolling

[larswik]

I have a couple images that I am adding to a UIScrollView that are 320w * 180h, some nice letter boxed photos. The photos get added and everything looks good but it won't scroll.

in my viewDidLoad I have this code

[self.view addSubview:[self scrollViewPhotos]];

To test this so far I added a couple of images to an NSMutableArray. I can see that it returns the images and I can offset the images horizontally to see that they are both there. For some reason it won't scroll.

-(UIScrollView *)scrollViewPhotos{
    int numOfImages, imageYsize;
    
    numOfImages = 2;
    imageYsize = 320;
    
    NSMutableArray *imagesArray = [[NSMutableArray alloc] init];
    UIImage *image1= [UIImage imageNamed:@"food_one_small.jpg"];
    UIImage *image2= [UIImage imageNamed:@"food_two_small.jpg"];
    [imagesArray addObject:image1];
    [imagesArray addObject:image2];

    UIScrollView *clientPhotos = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 200, 640, 180)];
    clientPhotos.pagingEnabled = YES;
    
    for (int i = 0; i < numOfImages; i++) {
        CGFloat imageStartPoint = imageYsize * i;
        
        UIImageView *itemToAdd = [[UIImageView alloc] initWithFrame:CGRectMake(imageStartPoint, 0, 320, 180)];
        itemToAdd.image = [imagesArray objectAtIndex:i];
        
        [clientPhotos addSubview: itemToAdd];
    }
    
    return clientPhotos;
}

 

[ArtOfWarfare]

Did you set contentSize?

 

[jnoxx]

You need to set the contentSize of the UIScrollview to a bigger size then your picture, so it will zoom/scroll.

 

[larswik]

I see, that has not been set then but I have a question about that. I am guessing that they contentSize would be the size of the photo that I am importing then?

If that is the case that size needs to be a variable. My images are 320 x 180 and I might have any where from 1 to 5 photos so it could be up to 1600 X 180. I am not sure where I set the contentSize. You can see the photo that I included that I am wanting to have the image in a frame and they they user swipes it to the next photo.

I need to find out where I my method I set up the content size.

Thanks!

 

[larswik]

Got it! I I found my 2 mistakes. After posting I thought it through and got it.

First I added the and it did not work.

clientPhotos.contentSize = CGSizeMake(640, 180);

Then I thought I also made my UIScrollView the same size as my content. I made the width of the scrollView only the size of the screen with 320 instead of 640.

It works perfect now!

Thanks for the push in the right direction!