Memory management 将UIPageviewController与UIWebview一起添加会在iPad3中造成意外内存崩溃，但在iPad2中工作正常

我正在开发iPad电子书类型的应用程序。我必须从web服务获取数据，并在应用程序开始时在webView中显示它。因此，在应用程序开始时，我使用UIWebview创建了一个UIViewController数组。当我在38-42页开始从一个页面遍历到另一个页面时，它会收到内存警告，并且仅在iPad3中崩溃，但在iPad2中工作正常

下面是代码。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 pageContent = [[NSMutableArray alloc] init];
 for (int i=0;i<60; i++)
 {

  [self addwebviewINCode];
 }
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin] forKey: UIPageViewControllerOptionSpineLocationKey];
    self.pageController = [[UIPageViewController alloc] 
                           initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
                           navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                           options: options];
    pageController.dataSource = self;
    pageController.delegate=self;
    [[pageController view] setFrame:[[self.window.rootViewController view] bounds]];
    UIViewController *viewC = [self viewControllerAtIndex:0];


NSArray *viewControllers =  [NSArray arrayWithObject:viewC];
[pageController setViewControllers:viewControllers  
                         direction:UIPageViewControllerNavigationDirectionForward 
                          animated:NO 
                        completion:nil];

[self.window.rootViewController addChildViewController:pageController];
[[self.window.rootViewController view] addSubview:[pageController view]];
[pageController didMoveToParentViewController:self.window.rootViewController];

[self.window makeKeyAndVisible];

return YES;

}

我正在使用UIViewController添加Webview


}

UIPageController委托方法 }

-（整数）indexOfViewController:（UIViewController*）viewController { 返回[self.pageContent indexOfObject:viewController]； }

-（NSInteger）getVCIndex:（UIViewController*）viewCon { if（[pageContent containsObject:viewCon]）{ 返回[pageContent indexOfObject:viewCon]； } 返回0； }

为什么会发生这种情况，因为它在iPad2中工作正常，但只在iPad3中发出内存警告并崩溃

有人能帮我解决这个问题吗？我花了太多的时间来解决这个问题

---

谢谢

看起来引用的代码在前面生成了所有视图控制器。应该只考虑UIPageViewController请求创建视图控制器。

对于初始设置ViewController:direction:animated:completion:call，向其发送一个数组，其中仅包含最初应显示的视图控制器（第一页）

在pageViewController:ViewControllerBeforeReviewController:和pageViewController:viewControllerAfterViewController:中，它将创建一个新的视图控制器，表示应在视图控制器中包含的内容传入参数之前或之后显示的内容，而不是将索引引用到数组中

通过这种方式，您不需要一次加载所有可能导致问题的页面（尤其是UIWebView）

-(void)addwebviewINCode
{
 UIViewController *viewC = [[UIViewController  alloc] initWithNibName:nil bundle:nil];


self.webVCustom = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, _window.bounds.size.width, 1004)];//20

self.webVCustom.suppressesIncrementalRendering=YES;
self.webVCustom.delegate=self;
self.webVCustom.scrollView.scrollEnabled=NO;

viewC.view=self.webVCustom;

[pageContent addObject:viewC];


- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers {
    pageAnimationFinished = YES;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
   if (flag == FALSE) {
        NSUInteger index = [self indexOfViewController:viewController];
        if ((index == 0) || (index == NSNotFound)) {
            return nil;
        }
        index--;
        return [self viewControllerAtIndex:index];
    }else {
        flag=FALSE;
    }
    return 0;
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
   if (flag == FALSE) {
        NSUInteger index = [self indexOfViewController:viewController];
        if (index == NSNotFound) {
            return nil;
        }
        index++;
        if (index == [self.pageContent count]) {
            return nil;
        }
        return [self viewControllerAtIndex:index];
    }else {
        flag=FALSE;
    }
    return 0;
}


-(void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
    UIViewController *viewC = [previousViewControllers objectAtIndex:0];
    NSInteger ind = [self getVCIndex:viewC];
    NSInteger indCur = [self getVCIndex:[pageViewController.viewControllers objectAtIndex:0]];
    if (ind == indCur) {
        indCurrentView=ind;
    }else {
        indCurrentView=indCur;
    }
    if (completed || finished)   // Turn is either finished or aborted
        pageAnimationFinished = NO;
}


-(UIViewController *)viewControllerAtIndex:(NSUInteger)index
{
    // Return the data view controller for the given index.
    if ((index >= [self.pageContent count])) {
        return nil;
    }
    // Create a new view controller and pass suitable data.
    UIViewController viewC = (UIViewController)[pageContent objectAtIndex:index];


return viewC;