[iPhone] "Refreshing" a pageControl

Question

I've got a pageControll based viewcontroller in my app, based off Apple's sample. Works pretty great, but I'm having a little trouble refreshing it when I add a new page. It acts in a Flip/Utility view combo. I can do my flipping fine, add a new "element" on the flipside, but when I flip back around, I can't quite get it to refresh properly.. I update the pageControl's numberOfPages, I load the new page. When I scroll to the new page, it won't let me scroll to it. It "shows" me the page, but it's as if I'm scrolling off the bounds (the view is there but it's treated like when you try scrolling past the far end of the pageControl.
Here's the relevant source... I hope somebody can help, it's driving me up the wall and I can't figure it out!
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSLog(@"appear!");
NSMutableArray *theControllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < dataController.courseItems.count; i++) {
[theControllers addObject:[NSNull null]];
self.controllas = theControllers;
[theControllers release];
pageControl.numberOfPages = dataController.courseItems.count;
pageControl.currentPage = 0;
[self loadScrollViewWithPage:0];
[self loadScrollViewWithPage:1];
- (void)viewDidLoad {
[super viewDidLoad];
pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 400, 320, 18)];
pageControl.hidesForSinglePage = NO;
pageControl.backgroundColor = [UIColor clearColor];
pageControl.numberOfPages = dataController.courseItems.count;
[self.view addSubview:pageControl];
[self.view setBackgroundColor:[UIColor blackColor]];
// a page is the width of the scroll view
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
[self.view addSubview:scrollView];
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * dataController.courseItems.count , scrollView.frame.size.height);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
[self viewWillAppear:YES];
- (void)loadScrollViewWithPage:(int)page {
if (page < 0) return;
if (page >= dataController.courseItems.count) return;
// replace the placeholder if needed
JBCoursesViewController *theController = [controllas objectAtIndex:page];
if ((NSNull *)theController == [NSNull null]) {
theController = [[JBCoursesViewController alloc] initWithNibName:nil bundle:nil];
theController.editingItem = [dataController.courseItems objectAtIndex:page];
[controllas replaceObjectAtIndex:page withObject:theController];
[theController release];
if (nil == theController.view.superview) {
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
theController.view.frame = frame;
[scrollView addSubview:theController.view];
- (void)scrollViewDidScroll:(UIScrollView *)sender {
// switch the indicator when more than 50% has scrolled
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];

Answer 1

hello
i am also facing a problem.
first problem is why the first view loaded twice in the example??
second problem is
i am generating a view as page control sample did.
but i want to add another view with flip animation for example.
i click on a table cell.the view is loading perfectly with my desired data.
but i am unable to load previous view....
means if i click on cell 5 i also want to go back to previous 4 views but unable to do it.
third problem is
i want a another view for example i double tap on the view and it flips to a new view.on that new view i want to show some text.again tapping on thet view i want to show the previous view.but the problem is if i swipe to next view the other sides view is loaded but with black screen