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我想在调用 viewControllerAfterViewController 之前重置应用于 imageView/scrollView 的缩放因子。我有一个 UIPageViewController“SecondViewController”和另一个 UIViewController“ImageViewController”。为了解释层次结构，我更喜欢显示一些代码：

#import "ImageViewController.h"
#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

@synthesize pageViewController;
@synthesize imgModelArray; 

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
    return imgModelArray.count;
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
    return 0;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [[self view] setBackgroundColor:[UIColor colorWithRed: 40/255.0 green:40/255.0 blue:40/255.0 alpha:1.0]];
    // Init model and pageViewController
     self.imgModelArray = [NSMutableArray arrayWithObjects:
                  [[ImageModel alloc] initWith:@"piaggo.jpg":@"softCat"],
                  [[ImageModel alloc] initWith:@"crumble.jpg":@"funnyDog"],
                  [[ImageModel alloc] initWith:@"piaggo.jpg":@"sleepingCat"],
                  [[ImageModel alloc] initWith:@"crumble.jpg":@"goodDog"],
                  [[ImageModel alloc] initWith:@"piaggo.jpg":@"softCat"],
                  [[ImageModel alloc] initWith:@"crumble.jpg":@"funnyDog"],
                  [[ImageModel alloc] initWith:@"piaggo.jpg":@"sleepingCat"],
                  [[ImageModel alloc] initWith:@"crumble.jpg":@"goodDog"], nil];
    self.pageViewController = [[UIPageViewController alloc]  initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
                                                      navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                                                                   options:[NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:50.0f] forKey:UIPageViewControllerOptionInterPageSpacingKey]];    
    self.pageViewController.delegate = self;
    self.pageViewController.dataSource = self;
    // Init ImageViewController - Load Model - Create page 1
    ImageViewController *imageViewController = [[ImageViewController alloc] init];
    imageViewController.model = [imgModelArray objectAtIndex:0];
    NSArray *viewControllers = [NSArray arrayWithObject:imageViewController];
    [self.pageViewController setViewControllers:viewControllers
                                  direction:UIPageViewControllerNavigationDirectionForward
                                   animated:NO
                                 completion:nil];
    [self addChildViewController:pageViewController];
    [self.view addSubview:pageViewController.view];
    [pageViewController didMoveToParentViewController:self];
    self.view.gestureRecognizers = pageViewController.gestureRecognizers;

 }

// Return an ImageViewController with previous data model
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)vcFrom
{
    ImageViewController *imgVc = (ImageViewController *)vcFrom;
    NSUInteger currentIndex = [imgModelArray indexOfObject:[imgVc model]];
    if (currentIndex == 0)
    {
        return nil;
    }
    ImageViewController *previousImgViewController = [[ImageViewController alloc] init];
    previousImgViewController.model = [imgModelArray objectAtIndex:currentIndex - 1];

    return previousImgViewController;
}

// Return an ImageViewController with next data model
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)vcFrom
{
    ImageViewController *imgVc = (ImageViewController *)vcFrom;
    [imgVc zoomX1];
    NSUInteger currentIndex = [imgModelArray indexOfObject:[imgVc model]];
    if (currentIndex == imgModelArray.count - 1)
    {
        return nil;
    }
    ImageViewController *nextImgViewController = [[ImageViewController alloc] init];    
    nextImgViewController.model = [imgModelArray objectAtIndex:currentIndex + 1];
    return nextImgViewController;  
}

@end

我想调用 zoomX1 方法（在 ImageViewController.m 中本地化），就在这个之前：“viewControllerAfterViewController” 什么样的事件可以做到这一点？

当我使用 viewControllerAfterViewController 时，zoomX1 工作得很好。当我在“viewControllerAfterViewController”中调用 zoomx1 时，我的视图正在消失......但是高度和宽度的值不是 0。请帮帮我！

在 ImageViewController.m 中：zoomX1

- (void)zoomX1{
    // Figure out the rect we want to zoom to, then zoom to X1
    UIImage *currentImage = [UIImage imageNamed:model.imageName];
    CGSize currentImgSize = currentImage.size;

    CGFloat w = currentImgSize.width;
    CGFloat h = currentImgSize.height;
    CGFloat x = 0;
    CGFloat y = 0;    
    CGRect rectToZoomTo = CGRectMake(x, y, w, h);

    [self.scrollView zoomToRect:rectToZoomTo animated:YES];
}

编辑（2X）：

我认为 UIPanGestureRecognizer 有问题。

在“SecondViewController.view”和“pageViewController”中：PanGesture 用于通过“viewControllerAfterViewController”和“viewControlleBeforeViewController”移动到下一个/上一个“ImageViewController”

在 "ImageViewController.scrollView" 中：当我放大图像时，PanGesture 用于移动到特定区域。

我没有以编程方式添加 PanGesture。我只想将 panGesture 保留在 scrollView 内，它负责在 Image 内移动。并将另一个 panGesture 链接在负责切换页面的视图级别。我认为它们是Apple的私有方法。

但是当我在 scrollView 内平移时出现问题。

4

1 回答 1

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我在我的一个项目中遇到了类似的问题，我在 UIPageViewController 的 UISwipeGestureRecognizer 中添加了一个额外的目标。你可以试试这个（其他开发人员可能认为这是一个 hack，但我不这么认为）。

在 viewDidLoad 或其他初始化/设置方法中，您可以尝试以下操作：

for(UIGestureRecognizer *gesture in yourPageViewController.gestureRecognizers) {
     if([gesture isKindOfClass:[UISwipeGestureRecognizer class]]) { 
        [gesture addTarget:self action:@selector(zoomX1)]
     }
}
于 2013-05-22T18:39:19.107 回答