photo gallery uiscrollView scrolling and zooming - iphone

Question

HI i'm tring to create photogallery with two scrollviews
one for horizontal scrolling between images and second for zooming images.
scrolling between images works fine but i'm not able to zoom image into second scrollView.
mainScrollView named VcLicences
VcLicences.h
#import <UIKit/UIKit.h>
#interface VcLicences : UIViewController <UIScrollViewDelegate>{
IBOutlet UIScrollView* scrollView;
IBOutlet UIPageControl* pageControl;
BOOL pageControlIsChangingPage;
}
#property (nonatomic, retain) UIView *scrollView;
#property (nonatomic, retain) UIPageControl* pageControl;
/* for pageControl */
- (IBAction)changePage:(id)sender;
/* internal */
- (void)setupPage;
#end
VcLicences.m
#import "VcLicences.h"
#import "VcImageZoomView.h"
#implementation VcLicences
#synthesize scrollView;
#synthesize pageControl;
- (void)setupPage
{
scrollView.delegate = self;
[self.scrollView setBackgroundColor:[UIColor whiteColor]];
scrollView.indicatorStyle = UIScrollViewIndicatorStyleBlack;
scrollView.clipsToBounds = YES;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
scrollView.multipleTouchEnabled = NO;
NSUInteger nim = 0;
CGFloat cx = 0;
NSArray *licence = [NSArray arrayWithObjects:#"zl1.jpg", #"zl2.jpg", #"zl3.jpg", #"dph.jpg", #"or.jpg", nil];
for (nim=0; nim < [licence count]; nim++)
{
VcImageZoomView *imageZoom = [[VcImageZoomView alloc] initWithNibName:#"VcImageZoomView" bundle:nil];
[imageZoom.view setFrame:CGRectMake(cx, 0, 320, 332)];
[imageZoom setMyImage:[licence objectAtIndex:nim]];
[scrollView addSubview:imageZoom.view];
[imageZoom release];
cx += scrollView.frame.size.width;
}
self.pageControl.numberOfPages = nim;
[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];
}
#pragma mark UIScrollViewDelegate stuff
- (void)scrollViewDidScroll:(UIScrollView *)_scrollView
{
if (pageControlIsChangingPage)
{
return;
}
CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView
{
pageControlIsChangingPage = NO;
}
- (IBAction)changePage:(id)sender
{
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * pageControl.currentPage;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];
pageControlIsChangingPage = YES;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
self.navigationItem.title = #"CZECHMAT's licenses";
[self setupPage];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
//[scrollView release];
//[pageControl release];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
//return (interfaceOrientation == UIInterfaceOrientationPortrait);
return YES;
}
#end
second ScrollView for zooming images named VcImageZoomView
VcImageZoomView.h
#import <UIKit/UIKit.h>
#interface VcImageZoomView : UIViewController <UIScrollViewDelegate>{
IBOutlet UIScrollView *scroll;
UIImageView *image;
}
#property (nonatomic, retain) UIScrollView *scroll;
-(void)setMyImage:(NSString *) imageName;
#end
VcImageZoomView.m
#import "VcImageZoomView.h"
#implementation VcImageZoomView
#synthesize scroll;
-(void)setMyImage:(NSString *) imageName;
{
NSLog(#"%#", imageName);
image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];
float scaleWidth = scroll.frame.size.width / image.frame.size.width;
float scaleHeight = scroll.frame.size.height / image.frame.size.height;
float scale = scaleWidth < scaleHeight ? scaleWidth : scaleHeight;
NSLog(#"%f", scale);
[scroll addSubview:image];
scroll.minimumZoomScale = scale;
scroll.maximumZoomScale = 1.0;
scroll.delegate = self;
[scroll setZoomScale:scroll.minimumZoomScale];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return image;
}
#end
thx for way

Answer 1

You really need to look at Apple's PhotoViewer sample and the WWDC'10 and '11 videos about ScrollViews: they are explaining in details (with this very example of a photoviewer scrolling and zooming) how to implement it:
How to recycle memory so that your memory footprint is drastically reduced (very important for fluidity)
How to handle both scrolling in one view and zooming in the other
If needed, how to do image tiling to optimize memory when zooming (only useful if you tiling is precomputed, so if you have images in your bundle anyway)
This is very interesting tutorials and videos and really worth reading/viewing.

Answer 2

https://github.com/doubleencore/KTPhotoBrowser
find above attached link get source code for photo gallery .....