UIScrollView Rotation Issues

I have a scrollview that automatically generates a series of subviews containing imageviews. The concept is that it's pretty much a custom PDF style reader, where each page is loaded in to an imageview as an image. There are three "layers" - the outer UIScrollView, the automatically generated subViews and the imageview inside the subview.

I've been having some trouble with this, I've asked 开发者_如何学编程the question previously, but unfortunately, the core of my question was in the wrong place. Here is my second attempt:

On rotate, everything is rotated as needed. Unfortunately, this is what I'm getting:

Obviously, I would like Image 1 to be centred and for there to be no hint of image 2 until you flick the view across.

Here is my code for setting up the view:

- (void)loadView {
    [self setUpView];
}
- (void)setUpView {
    //INITIALISE PAGING SCROLL VIEW
    CGRect pagingScrollViewFrame = [[UIScreen mainScreen] bounds];
    pagingScrollViewFrame.origin.x -= 10;
    pagingScrollViewFrame.size.width += 20;
    pagingScrollView = [[UIScrollView alloc] initWithFrame:pagingScrollViewFrame];
    pagingScrollView.contentMode =  UIViewContentModeScaleAspectFit;
    
    //CONFIGURE PAGING SCROLL VIEW  
    pagingScrollView.pagingEnabled = YES;
    pagingScrollView.backgroundColor = [UIColor blackColor];
    pagingScrollView.contentSize = CGSizeMake(pagingScrollViewFrame.size.width*7, pagingScrollViewFrame.size.height);
    
    //ACTIVATE PAGING SCROLL VIEW
    self.view = pagingScrollView;
    
    //ADD PAGES TO SCROLL VIEW
    for (int i = 0; i < 7; i++){
        ImageScrollView *page = [[[ImageScrollView alloc] init] autorelease];
        [self configurePage:page forIndex:i];
        [pagingScrollView addSubview:page];
    }
}

How do I re-define the size of the frame? What function should I call etc. How do I centre the image?

I'm new to this so I apologise for the ambiguity of my question.

Cheers

I've figured it out. It was the Frame of the individual pages that I needed to change, so (with the help gained from another question) I wrote a re-orient method.

The first step to this came because I figured out that I needed to iterate through and re-size each frame for each of my pages and then re-apply the frames to the view. For this to happen I needed to create an array which I would fill in the For Loop above. I have 7 total pages.

Then I could (on rotate) call the below re-orient method to re-size each view:

- (void) reOrient{
    if(UIInterfaceOrientationIsPortrait(self.interfaceOrientation)){    
        CGRect f;
        int i = 0;
        for (ImageScrollView *page in pageArray) {          
            f = page.frame;
            f.size.width = 320;
            f.origin.x = (f.size.width * i);
            page.frame = f;
            pagingScrollView.contentSize = CGSizeMake(f.size.width * 7, 480);
            i++;
        }
    }else{
        CGRect f;
        int i = 0;
        for (ImageScrollView *page in pageArray) {          
            f = page.frame;
            f.size.width = 480;
            f.origin.x = (f.size.width * i);
            page.frame = f;
            pagingScrollView.contentSize = CGSizeMake(f.size.width * 7,  480);
            i++;
        }
    }
}

This worked for me:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];

    //get current page based on offset before rotation    
    NSInteger currentPage = self.scrollView.contentOffset.x / self.scrollView.bounds.size.width;

    //set anticipated scrollview content size by switching width and height (they will be switched after rotation)
    [self.scrollView setContentSize:CGSizeMake(totalPages * self.view.bounds.size.height, self.view.bounds.size.width)];

    //set the anticipated content offset based on height before rotation
    [self.scrollView setContentOffset:CGPointMake(currentPage * self.scrollView.bounds.size.height, 0.0f)];
}

Basically I am setting the content offset for the new scrollview content size before rotating (I'm switching height and width for the anticipated height and width).

This worked for me when rotating a full-screen paged UIScrollView.

All of the paged subviews have the following autoresizing mask so that they neatly fall into place after rotation:

UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleRightMargin