How can i provide Zoomin-Zoomout,Paging functionality in to UIScrollView? - iphone

Question

I have an array of Image URl's from that array i have displayed my Images in Scrollview because i want to take the advantage of Paging and zooming so what should i do to achieve this task?suppose my array contains 10 URL then by each time scrolling i should get different image and i could also performing Zooming-In and Zooming-Out any of the 10 Images so please give me some guidelines to achieve my task.Thanks in Advance.

Answer 1

Try this
- (void)setCurrentPage:(NSUInteger)page {
if (page == offsetX)
return;
offsetX = page;
// in a real app, this would be a good place to instantiate more view controllers -- see SDK examples
}
- (CGSize)pageSize {
CGSize pageSize = scrollView1.frame.size;
if (UIInterfaceOrientationIsLandscape(self.interfaceOrientation))
return CGSizeMake(pageSize.height, pageSize.width);
else
return pageSize;
}
- (void)setPagingMode {
// reposition pages side by side, add them back to the view
CGSize pageSize = [self pageSize];
NSUInteger page = 0;
for (UIView *view in imgViewArray) {
if (!view.superview)
[scrollView1 addSubview:view];
view.frame = CGRectMake(pageSize.width * page++, 0, pageSize.width, pageSize.height);
}
scrollView1.pagingEnabled = YES;
scrollView1.showsVerticalScrollIndicator = scrollView1.showsHorizontalScrollIndicator = NO;
scrollView1.contentSize = CGSizeMake(pageSize.width * [imgViewArray count], pageSize.height);
scrollView1.contentOffset = CGPointMake(pageSize.width * offsetX, 0);
scrollViewMode = ScrollViewModePaging;
}
- (void)setZoomingMode {
NSLog(#"setZoomingMode");
scrollViewMode = ScrollViewModeZooming; // has to be set early, or else currentPage will be mistakenly reset by scrollViewDidScroll
// hide all pages except the current one
NSUInteger page = 0;
for (UIView *view in imgViewArray)
if (offsetX != page++)
[view removeFromSuperview];
scrollView1.pagingEnabled = NO;
scrollView1.showsVerticalScrollIndicator = scrollView1.showsHorizontalScrollIndicator = YES;
pendingOffsetDelta = scrollView1.contentOffset.x;
scrollView1.bouncesZoom = YES;
}
- (void)scrollViewDidScroll:(UIScrollView *)aScrollView
{
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
// offsetX=(aScrollView.contentOffset.x)/768;
//NSLog(#"Page No:%d",offsetX);
if (scrollViewMode == ScrollViewModePaging)
[self setCurrentPage:roundf(scrollView1.contentOffset.x / [self pageSize].width)];
}
else
{
//offsetX=(aScrollView.contentOffset.x)/320;
//NSLog(#"Page No:%d",offsetX);
if (scrollViewMode == ScrollViewModePaging)
[self setCurrentPage:roundf(scrollView1.contentOffset.x / [self pageSize].width)];
}
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)aScrollView
{
NSLog(#"viewForZoomingInScrollView");
if (scrollViewMode != ScrollViewModeZooming)
[self setZoomingMode];
return [imgViewArray objectAtIndex:offsetX];
}
- (void)scrollViewDidEndZooming:(UIScrollView *)aScrollView withView:(UIView *)view atScale:(float)scale {
NSLog(#"scrollViewDidEndZooming");
if (scrollView1.zoomScale == scrollView1.minimumZoomScale)
[self setPagingMode];
else if (pendingOffsetDelta > 0) {
UIView *view = [imgViewArray objectAtIndex:offsetX];
view.center = CGPointMake(view.center.x - pendingOffsetDelta, view.center.y);
CGSize pageSize = [self pageSize];
scrollView1.contentOffset = CGPointMake(scrollView1.contentOffset.x - pendingOffsetDelta, scrollView1.contentOffset.y);
scrollView1.contentSize = CGSizeMake(pageSize.width * scrollView1.zoomScale, pageSize.height * scrollView1.zoomScale);
pendingOffsetDelta = 0;
}
}