Question

I want to have a scroll view, where you display 5 thumbnails on the scroll view each time.
Basically it’s a table with one row and in each row we have 5 thumbnails in it.
You slide your finger to the right then you display the next set of 5 thumbnails.

What do I need to do this?? Is it true that we need a scroll view to do this? How can I start?

Answer 1

In your UIView that will contain your UIScrollView, place (something like) this code in -viewDidLoad:

UIScreen *screen = [UIScreen mainScreen];
pageWidth = screen.bounds.size.height;
pageHeight = screen.bounds.size.width;


scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, pageWidth, pageHeight)];
[scrollView setAutoresizingMask:UIViewAutoresizingNone];
[scrollView setContentSize:CGSizeMake(numPages * pageWidth, pageHeight)];
[scrollView setContentOffset:CGPointMake(pageWidth, 0)];
[scrollView setPagingEnabled:YES];
[scrollView setDelaysContentTouches:YES];
[scrollView setDelegate:self];
[scrollView setClearsContextBeforeDrawing:NO];
[scrollView setOpaque:YES];

[self.view insertSubview:scrollView atIndex:0];
[scrollView release];

// iterate through your thumbnails - which are UIViews
thumbnailViews = [NSMutableArray array];
[thumbnailViews retain];
NSUInteger pageCounter = 0;

for (...)
    {
    ThumbnailView *thumbnailView = [[ThumbnailView alloc] initWithFrame:CGRectMake( pageCounter*pageWidth, 0, pageWidth, pageHeight )];
    [thumbnailView setMultipleTouchEnabled:YES];
    [thumbnailView setViewController:self]; // this may be necessary to push/pop on navigation controller stack.
    [thumbnailView restoreState];
    [scrollView thumbnailView];
    [thumbnailViews thumbnailView];
    ++pageCounter;
}

In my case, pageWidth, pageHeight, thumbnailViews and scrollView are all ivars for my UIView subclass.