How to get the "front" uiimageview from uiscrollviews?

I have seen this question asked in other places...but no valid answers...

I have a UIScrollView that scrolls horizontally. I have 3 photos in them...ie: subviews of the U开发者_高级运维IScrollView hold UIImageViews as below: (in this case, all the subviews of the UIScrollView are showing path_to_file.png... for ease of asking this question)

NSString *filepath = @"path_to_file.png";
UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0,self.view.frame.size.width, self.view.frame.size.height)];
scroll.delegate = self;
scroll.pagingEnabled = YES;
NSInteger numberOfViews = 3;
int maxImageWidth = 0;
for (int i = 0; i < numberOfViews; i++)  
{
    CGFloat yOrigin = i * self.view.frame.size.width;
    UIImage *imgWord = [[UIImage alloc] initWithContentsOfFile:filePath];
    UIImageView *imgWordView = [[UIImageView alloc] initWithImage:imgWord];
    [imgWord release];
    imgWordView.center = CGPointMake ((cell.contentView.frame.size.width/2) + yOrigin,imgWord.size.height/2);
    if (cell.contentView.frame.size.width > maxImageWidth)  {
    maxImageWidth = cell.contentView.frame.size.width;
    }
    [scroll addSubview:imgWordView];
    [imgWordView release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, self.view.frame.size.height);
[cell.contentView addSubview:scroll]; 
[scroll release];

Having the above code snippet, I run across the fact that I need:

-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return image;
}

to zoom my UIImageView in the UIScrollView. How do i find out which UIImageView is showing in the UIScrollview so i can in turn access that UIImageView to get the UIImage in order to return it in viewForZoomingInScrollView?

Please explain this as I do not see how we are to track the 'displayed' subview ourselves...

Thanks!

How do i find out which UIImageView is showing in the UIScrollview so i can in turn access that UIImageView to get the UIImage in order to return it in viewForZoomingInScrollView?

You can track where you are in:

- (void) scrollViewDidScroll:(UIScrollView *)scrollView


CGFloat pageWidth = ScrollView.frame.size.width;
page = floor((self.ScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; 

That lets me know what "page" of content I'm on as the user scrolls through it.

You could subclass the UIImageView class and implement the touch methods.

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    int page_ = (int)round(scrollView.contentOffset.x /scrollView.frame.size.width);
}