Question

I have a scrollview that is set up to scroll back and forth between 2 pages. Each page uses different data for labels, etc… on the same view controller.

I need to re-load the data on each page, without exiting the ‘sub’ view.

For example, I navigate to page 1 in the scroll view. My web svc sends me updated data via notification. I need to reload the data that is on page 2, while still sitting on page 1… or at least reload that data the instant I start scrolling to page 2.

I hope this makes sense. Thanks in advance!

(snippet from my scrollView.. but I would think I need to add something in my subview..?)

- (void)loadScrollViewWithPage:(int)page {
if (page < 0) return;
if (page >= kNumberOfPages) return;

if ([controllerName isEqualToString:@"ClassicViewController"]){
    ClassicViewController *controller = [viewControllers objectAtIndex:page];
    if ((NSNull *)controller == [NSNull null]) {

        controller = [[ClassicViewController alloc] initWithPageNumber:page];
        controller.referringObject = self.referringObject;
        controller.user = self.user;
        controller.pushedFromScroll = kTrue;
        controller.theirRoll = self.theirRoll;

         NSLog(@"page replaced # = %d", page);
        [viewControllers replaceObjectAtIndex:page withObject:controller];
        [controller release];
    }


    if (nil == controller.view.superview) {
        CGRect frame = scrollView.frame;
        frame.origin.x = frame.size.width * page;
        frame.origin.y = 0;
        controller.view.frame = frame;
        [scrollView addSubview:controller.view];
    }
}

}

Answer 1

You have some options, but I think if your data is posting a notification that it’s been updated, you should have the view controller for each page be responsible for updating the elements of their view. So –

1. Have each view controller subscribe to the notification you describe with NSNotificationCenter‘s addObserver:selector:name:objet method.
2. Implement the notification handler whose selector you passed to addObserver... to update the view based on the changes.

Hope this helps!