UIScrollView content not updating - iphone

Question

I have UIScrollView in stage and paging functionality enabled to move back/next.
I have added 10 subviews in UIScrollView. When I have modify the content inside the subviews, then it is not reflected in UIScrollView.
Book.m
- (void) initializeWithXML:(NSString *)XMLURLString {
NSData *xmlData;
NSString *url;
if ( ![applicationData getMode] ) {
resourceRootURL = [[applicationData getAssetsPath] stringByAppendingPathComponent:#"phone/"];
} else {
resourceRootURL = [applicationData getAssetsPath];
}
url = [resourceRootURL stringByAppendingPathComponent:XMLURLString];
//NSLog(#"Root URL...%#", url);
if ([url rangeOfString:#"http"].location != NSNotFound) {
xmlData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
} else {
xmlData = [NSData dataWithContentsOfFile:url];
}
bookContentArray = [self grabXML:xmlData andQuery:#"//page"];
// view controllers are created lazily
// in the meantime, load the array with placeholders which will be replaced on demand
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < kNumberOfPages; i++) {
[controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;
[controllers release];
for(int i = 0; i < [bookContentArray count]; i++) {
[viewControllers addObject:[NSNull null]];
}
if ( isTwoPage ) {
kNumberOfPages = [bookContentArray count];
} else {
kNumberOfPages = [bookContentArray count]/2;
}
CGRect pagingScrollViewFrame = [self frameForPagingScrollView];
scrollView = [[UIScrollView alloc] initWithFrame:pagingScrollViewFrame];
scrollView.pagingEnabled = YES;
scrollView.backgroundColor = [UIColor blackColor];
scrollView.showsVerticalScrollIndicator = NO;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.contentSize = [self contentSizeForPagingScrollView];
scrollView.contentSize = CGSizeMake(scrollView.contentSize.width,scrollView.frame.size.height);
scrollView.delegate = self;
self.view = scrollView;
kNumberOfPages = [bookContentArray count];
pageControl.numberOfPages = kNumberOfPages;
pageControl.currentPage = 0;
// pages are created on demand
// load the visible page
// load the page on either side to avoid flashes when the user starts scrolling
[self loadPage:0];
}
- (void) loadPage:(int)number {
// Calculate which pages are visible
int firstNeededPageIndex = MAX(number-1, 0);
int lastNeededPageIndex = MIN(number+1, [viewControllers count] - 1);
//NSLog(#"%d,%d",firstNeededPageIndex,lastNeededPageIndex);
// Recycle no-longer-visible pages
for(int i = 0; i < [viewControllers count]; i++) {
ImageScrollView *page = [viewControllers objectAtIndex:i];
if ((NSNull *)page != [NSNull null]) {
if (page.index < firstNeededPageIndex || page.index > lastNeededPageIndex) {
//NSLog(#"removed page %d", page.index);
[page removeImages];
[page removeFromSuperview];
page = nil;
[viewControllers replaceObjectAtIndex:i withObject:[NSNull null]];
}
}
}
// load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
if ( number == 0 ) {
[self loadScrollViewWithPage:number];
[self loadScrollViewWithPage:number+1];
} else if ( number == [bookContentArray count]-1) {
[self loadScrollViewWithPage:number-1];
[self loadScrollViewWithPage:number];
} else {
[self loadScrollViewWithPage:number-1];
[self loadScrollViewWithPage:number];
[self loadScrollViewWithPage:number+1];
}
}
- (void)loadScrollViewWithPage:(int)page {
ImageScrollView *pageController = [[ImageScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
pageController.index = page;
pageController.myDelegate = self;
pageNumber = pageControl.currentPage;
pageController.isTwoPage = isTwoPage;
if ( pageNumber == page ) {
pageController.isCurrentPage = YES;
} else {
pageController.isCurrentPage = NO;
}
[controller setImageURL:leftURL andRightURL:rightURL andPriority:0];
[scrollView addSubview:controller];
}
ImageScrollView.m
- (void) setImageURL:(NSString *)leftURL andRightURL:(NSString *)rightURL andPriority:(int)priority {
[imageView removeFromSuperview];
[imageView release];
imageView = nil;
if ( !isTwoPage ) {
imageView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
} else {
imageView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
}
if ( isTwoPage ) {
leftImage = [[FBEPage alloc] initWithNibName:#"FBEPage" bundle:nil];
leftImage.view.frame = CGRectMake(0, 43, 512, 682);
rightImage = [[FBEPage alloc] initWithNibName:#"FBEPage" bundle:nil];
rightImage.view.frame = CGRectMake(512, 43, 512, 682);
} else {
leftImage = [[FBEPage alloc] initWithNibName:#"FBEPage" bundle:nil];
leftImage.view.frame = imageView.frame;
rightImage = [[FBEPage alloc] initWithNibName:#"FBEPage" bundle:nil];
rightImage.view.frame = imageView.frame;
}
leftImage.delegate = self;
rightImage.delegate = self;
if ( isFirstPage ) {
[leftImage.view setHidden:YES];
[rightImage.view setHidden:NO];
} else if ( isLastPage ) {
[leftImage.view setHidden:NO];
[rightImage.view setHidden:YES];
} else if ( !isTwoPage ) {
[leftImage.view setHidden:NO];
[rightImage.view setHidden:YES];
} else {
[leftImage.view setHidden:NO];
[rightImage.view setHidden:NO];
}
imageView.backgroundColor = [UIColor whiteColor];
[self addSubview:imageView];
[leftImage setImageURL:leftURL];
[rightImage setImageURL:rightURL];
[imageView addSubview:leftImage.view];
[imageView addSubview:rightImage.view];
}
FBPage.m
- (void) setImageURL:(NSString *)url {
imageView = [[UIImageView alloc] init];
imageView.frame = CGRectMake(0, 0, 768, 1024);
imageView.center = self.view.center;
imageView.userInteractionEnabled = TRUE;
[container addSubview:imageView];
[activityIndicator setHidden:YES];
if ([url rangeOfString:#"http"].location != NSNotFound) {
SDWebImageManager *manager = [SDWebImageManager sharedManager];
UIImage *cachedImage = [manager imageWithURL:[NSURL URLWithString:url]];
if (cachedImage) {
[imageView setImage:cachedImage];
isImageLoaded = YES;
[self addScrollView];
} else {
[activityIndicator setHidden:NO];
[activityIndicator startAnimating];
[manager downloadWithURL:[NSURL URLWithString:url] delegate:self options:0 success:^(UIImage *image){
[activityIndicator stopAnimating];
[activityIndicator setHidden:YES];
[imageView setImage:image];
isImageLoaded = YES;
[self addScrollView];
} failure:nil];
}
imageURL = url;
} else {
imageView.image = [UIImage imageWithContentsOfFile:url];
isImageLoaded = YES;
[self addScrollView];
}
}
- (void) setHotspotURL:(NSString *)URL {
[hotspot.view removeFromSuperview];
[hotspot release];
hotspot = nil;
hotspot = [[FBHotspot alloc] initWithNibName:#"FBHotspot" bundle:nil];
hotspot.view.frame = CGRectMake(0, 0, 768, 1024);
hotspot.delegate = self;
[hotspot setURL:URL];
[container addSubview:hotspot.view];
}
**When I am calling setHotspotURL and it’s not updating to the scrollview.**

Answer 1

Make sure you inserted your content at the correct position within the scroll view. Set the contentSize accordingly. Try to call layoutSubviews of the UIScrollView instance