Stop and start videos within a UIScrollView - ios

Question

I've been playing around with this for a day now and have hit a brick wall.
I want to have a UIScrollView that shows a series of videos that the user can scroll across. Setting up the UIScrollView is fine and each item within it (I'm calling them MenuItems) is a subclass of UiViewController that contains and manages all of the setup of the MPMoviePlayerController etc.
I discovered however that you can only have one MPMoviePlayerController in a window, playing at once.
So, I thought the best way to handle this is to have accessible methods on each MenuItem, stopVideo and startVideo that I would trigger as each menu item became the "focus" of the UiScrollView (I have successfully coded the delegate so that it captures the scroll event and works out which page is in the centre of the scrollview).
The problem is, I can't work out how to access the MenuItem objects in the UiScrollView.
I have the following code in the UIScrollView delegate to do this:
- (void)scrollViewDidScroll:(UIScrollView *)sView {
//establish what page we're on
static NSInteger previousPage = 0;
MenuItem *currentMenuItem;
MenuItem *previousMenuItem;
CGFloat pageWidth = sView.frame.size.width;
float fractionalPage = sView.contentOffset.x / pageWidth;
NSInteger page = lround(fractionalPage);
if (previousPage != page) {
//firstly, get the previous page and stop the video
previousMenuItem = [sView.subviews objectAtIndex:previousPage];
previousMenuItem = [previousMenuItem nextResponder];
[previousMenuItem hideVideo];
//[previousMenuItem release];
//page has changed, get the new current page and start the video
currentMenuItem = [sView.subviews objectAtIndex:page];
currentMenuItem = [currentMenuItem nextResponder];
[currentMenuItem showVideo];
//[currentMenuItem release];
previousPage = page;
}
}
The methods showVideo and hideVideo are called, but I get other errors (for example, I can't seem to initialize an MPMoviePlayerController inside the MenuItem without an SIGABRT error).
I'm thinking my methodology is flawed here or that there is a simpler approach? All help appreciated!
Many thanks.

Answer 1

bit late for a response but I got stuck on this as well and managed to bash out a solution so thought I'd include it for anyone else.
I think it has to do with memory allocation for the movie players.
I included this code in my .h file
#interface VideoInstructionViewController : UIViewController <UIScrollViewDelegate>
{
MPMoviePlayerController *player0;
MPMoviePlayerController *player1;
MPMoviePlayerController *player2;
}
and so that the movie players were effectively global and then just included this code in my .m file.
player0 = [[MPMoviePlayerController alloc] initWithContentURL:contentURL];
player1 = [[MPMoviePlayerController alloc] initWithContentURL:contentURL];
player2 = [[MPMoviePlayerController alloc] initWithContentURL:contentURL];
The rest of your code was very useful, I think it's a solid methodology, thanks!