Save and load a UIScrollView position - iphone

Question

Im creating an app that uses a UIScrollView that scrolls through images and a segmented control that loads a new view and allows a new layer of images (bit like Photoshop layering) - For some reason when I click back on the layer, it remembers the position but creates a new layer.... How can I stop this from happening, so once a layer has been selected and an image chosen, when the user returns it goes to the last loaded position?
Also, as a side thing... I cannot use my gesture recognition or UIAlertView when the UIScrollView is loaded? Does anyone know why?
Here is my code.... And thanks in advance:)
- layerControl:(NSInteger)index
{
UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
scroll.pagingEnabled = YES;
NSInteger viewCount = 15;
for (int i = 0; i < viewCount; i++) {
CGFloat yOrigin = i * self.view.frame.size.width;
UIImageView *filterViewOverlay = [[UIImageView alloc] initWithFrame:CGRectMake(yOrigin, 0, self.view.frame.size.width, self.view.frame.size.height)];
[filterViewOverlay setImage:[filterManager objectAtIndex:i]];
[scroll addSubview:filterViewOverlay];
[filterViewOverlay release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * viewCount, self.view.frame.size.height);
[self.view addSubview:scroll];
[scroll release];
switch (index)
{
case 0: scroll = self.scroll1;
case 1: scroll = self.scroll2;
case 2: scroll = self.scroll3;
case 4: scroll = self.scroll4;
case 5: scroll = self.scroll5;
}
/* if (scroll == nil)
{
[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
scroll.pagingEnabled = YES;
NSInteger viewCount = 15;
for (int i = 0; i < viewCount; i++) {
CGFloat yOrigin = i * self.view.frame.size.width;
UIImageView *filterViewOverlay = [[UIImageView alloc] initWithFrame:CGRectMake(yOrigin, 0, self.view.frame.size.width, self.view.frame.size.height)];
[filterViewOverlay setImage:[filterManager objectAtIndex:i]];
[scroll addSubview:filterViewOverlay];
//[filterViewOverlay release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * viewCount, self.view.frame.size.height);
[self.view addSubview:scroll];
[scroll autorelease]; */
}
}
//Method to add a filter to the page
- (void)addFilter:(id)sender
{
UISegmentedControl *filterController = (UISegmentedControl *)sender;
[self layerControl:[filterController selectedSegmentIndex]];
}
- (UIImage*)saveImages
{
UIImage *image = [UIImage imageNamed:#"UrbanPhoto##1"];
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}

Answer 1

Try saving the value of UIScrollView.contentOffset before the user action, and then restoring that value after the action is completed.