iOS多图片分页和缩放问题

有几个线程与这个问题有关，但是找不到一个可靠的解决scheme。 任何帮助，将不胜感激。 如果你给它一个图像，这个代码很好用。 放大完美。 你给它两个图像滚动扔图像很好，但是当你放大它总是放大到第一个图像？ 不知道为什么viewForZoomingInScrollView方法不知道你在哪个视图。 代码如下

PagedScrollViewController.h

#import <UIKit/UIKit.h> @interface PagedScrollViewController : UIViewController <UIScrollViewDelegate> @property (nonatomic, strong) IBOutlet UIScrollView *scrollView; @property (nonatomic, strong) IBOutlet UIPageControl *pageControl; @property (nonatomic, strong) IBOutlet UIButton *cancelButtonClicked; @property (nonatomic, strong) IBOutlet UILabel *headerTitle; @property (nonatomic, strong) IBOutlet NSString *headerTitleS; @property (nonatomic, strong) IBOutlet NSMutableArray *pageImages; @property (nonatomic, strong) IBOutlet UITextView *caption; @property (weak, nonatomic) IBOutlet UINavigationBar *navigationBar; @property (nonatomic, strong) NSMutableArray *captionArray; -(IBAction)cancelButtonClicked:(id)sender; @end 

PagedScrollViewController.m

 @interface PagedScrollViewController () @property (nonatomic, strong) NSMutableArray *pageViews; - (void)loadVisiblePages; - (void)loadPage:(NSInteger)page; - (void)purgePage:(NSInteger)page; @end @implementation PagedScrollViewController @synthesize scrollView = _scrollView; @synthesize pageControl = _pageControl; @synthesize pageImages = _pageImages; @synthesize pageViews = _pageViews; @synthesize cancelButtonClicked = _cancelButtonClicked; @synthesize headerTitle = _headerTitle; @synthesize headerTitleS = _headerTitleS; @synthesize caption = _caption; @synthesize captionArray = _captionArray; - (void)loadVisiblePages { // First, determine which page is currently visible CGFloat pageWidth = self.scrollView.frame.size.width; NSInteger page = (NSInteger)floor((self.scrollView.contentOffset.x * 2.0f + pageWidth) / (pageWidth * 2.0f)); // Update the page control self.pageControl.currentPage = page; NSObject *captionObject = [self.captionArray objectAtIndex:page]; NSString *captionString = [NSString stringWithFormat:@"%@", [captionObject valueForKey:@"caption"]]; self.caption.text = captionString; // Work out which pages we want to load NSInteger firstPage = page - 1; NSInteger lastPage = page + 1; // Purge anything before the first page for (NSInteger i=0; i<firstPage; i++) { [self purgePage:i]; } for (NSInteger i=firstPage; i<=lastPage; i++) { [self loadPage:i]; } for (NSInteger i=lastPage+1; i<self.pageImages.count; i++) { [self purgePage:i]; } } - (void)loadPage:(NSInteger)page { if (page < 0 || page >= self.pageImages.count) { // If it's outside the range of what we have to display, then do nothing return; } // Load an individual page, first seeing if we've already loaded it UIView *pageView = [self.pageViews objectAtIndex:page]; if ((NSNull*)pageView == [NSNull null]) { CGRect frame = self.scrollView.bounds; frame.origin.x = frame.size.width * page; frame.origin.y = 0.0f; UIImageView *newPageView = [[UIImageView alloc] initWithImage:[self.pageImages objectAtIndex:page]]; newPageView.contentMode = UIViewContentModeScaleAspectFit; newPageView.frame = CGRectMake((page*320), 0, 310, 320); self.scrollView.maximumZoomScale = 1.3; self.scrollView.contentSize = CGSizeMake(320*[self.pageImages count],389); self.scrollView.frame = CGRectMake(320*(self.pageControl.currentPage), 44, 310, 370); [self.scrollView addSubview:newPageView]; [self.pageViews replaceObjectAtIndex:page withObject:newPageView]; } } - (void)purgePage:(NSInteger)page { if (page < 0 || page >= self.pageImages.count) { // If it's outside the range of what we have to display, then do nothing return; } // Remove a page from the scroll view and reset the container array UIView *pageView = [self.pageViews objectAtIndex:page]; if ((NSNull*)pageView != [NSNull null]) { [pageView removeFromSuperview]; [self.pageViews replaceObjectAtIndex:page withObject:[NSNull null]]; } } -(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView { self.scrollView.contentSize = CGSizeMake(320*[self.pageImages count],389); return [self.scrollView.subviews objectAtIndex:self.pageControl.currentPage]; } - (void)viewDidLoad { [super viewDidLoad]; self.scrollView.delegate = self; self.headerTitle.text = self.headerTitleS; // Set up the image we want to scroll & zoom and add it to the scroll view NSInteger pageCount = self.pageImages.count; // Set up the page control self.pageControl.currentPage = 0; self.pageControl.numberOfPages = pageCount; // Set up the array to hold the views for each page self.pageViews = [[NSMutableArray alloc] init]; for (NSInteger i = 0; i < pageCount; ++i) { [self.pageViews addObject:[NSNull null]]; } } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; // Load the initial set of pages that are on screen [self loadVisiblePages]; } - (void)viewDidUnload { [super viewDidUnload]; self.scrollView = nil; self.pageControl = nil; self.pageImages = nil; self.pageViews = nil; } - (void)scrollViewDidScroll:(UIScrollView *)scrollView { [self loadVisiblePages]; } -(IBAction)cancelButtonClicked:(id)sender{ [self dismissViewControllerAnimated:YES completion:nil]; } @end 

Answer 1

这是我发现的工作。 支持分页和缩放的多个图像。 请享用！

 #define VIEW_FOR_ZOOM_TAG (1) @implementation SVViewController - (void)viewDidLoad { [super viewDidLoad]; UIScrollView *mainScrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds]; mainScrollView.pagingEnabled = YES; mainScrollView.showsHorizontalScrollIndicator = NO; mainScrollView.showsVerticalScrollIndicator = NO; CGRect innerScrollFrame = mainScrollView.bounds; for (NSInteger i = 0; i < 3; i++) { UIImageView *imageForZooming = [[UIImageView alloc] initWithImage:[UIImage imageNamed: [NSString stringWithFormat:@"page%d", i + 1]]]; imageForZooming.tag = VIEW_FOR_ZOOM_TAG; UIScrollView *pageScrollView = [[UIScrollView alloc] initWithFrame:innerScrollFrame]; pageScrollView.minimumZoomScale = 1.0f; pageScrollView.maximumZoomScale = 2.0f; pageScrollView.zoomScale = 1.0f; pageScrollView.contentSize = imageForZooming.bounds.size; pageScrollView.delegate = self; pageScrollView.showsHorizontalScrollIndicator = NO; pageScrollView.showsVerticalScrollIndicator = NO; [pageScrollView addSubview:imageForZooming]; [mainScrollView addSubview:pageScrollView]; if (i < 2) { innerScrollFrame.origin.x += innerScrollFrame.size.width; } } mainScrollView.contentSize = CGSizeMake(innerScrollFrame.origin.x + innerScrollFrame.size.width, mainScrollView.bounds.size.height); [self.view addSubview:mainScrollView]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return [scrollView viewWithTag:VIEW_FOR_ZOOM_TAG]; } - (NSUInteger)supportedInterfaceOrientations { return UIInterfaceOrientationMaskPortrait; } - (BOOL)shouldAutorotate { return NO; } @end