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我正在使用来自 xcode 的基于页面的应用程序模板，该模板创建了 RootViewController、DataViewController 和 ModelController。

我已经设法让它从 RootViewController 转到我需要的任何页面，但我还需要 DataViewController 中的这个，在特定页面的事件上触发。这不太好。我应该如何更改代码以使其从 DataViewController 工作？

我的代码如下所示：-从根（工作）：

//get current index of current page
DataViewController *theCurrentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
NSUInteger retreivedIndex = [self.modelController indexOfViewController:theCurrentViewController];

//get the page(s) to go to
DataViewController *targetPageViewController = [self.modelController viewControllerAtIndex:(pageToGoTo - 1) storyboard:self.storyboard];

//put it(or them if in landscape view) in an array
NSArray *theViewControllers = nil;
theViewControllers = [NSArray arrayWithObjects:targetPageViewController, nil];

//check which direction to animate page turn then turn page accordingly
if (retreivedIndex < (pageToGoTo - 1) && retreivedIndex != (pageToGoTo - 1)){
[self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]; 
} 
if (retreivedIndex > (pageToGoTo - 1) && retreivedIndex != (pageToGoTo - 1)){
[self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:NULL];
}

- 从页面，dataviewcontroller（不工作）：

DataViewController *targetPageViewController = [((UIPageViewController*)self.parentViewController) viewControllerAtIndex:(pageToGoTo - 1) storyboard:self.storyboard]; //The problem is here, but I do not know how to solve it.


//put it(or them if in landscape view) in an array
NSArray *theViewControllers = nil;
theViewControllers = [NSArray arrayWithObjects:targetPageViewController, nil];


[((UIPageViewController*)self.parentViewController) setViewControllers: theViewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
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1 回答 1

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我在这里回答了这个问题 https://stackoverflow.com/a/16435166/1463518

我这样做的方法是使用通知

我在 DataViewController 中的按钮单击上添加了一个通知

[[NSNotificationCenter defaultCenter]postNotificationName:@"H2RAutoPage" object:nil];

并在 RootViewController 中的 viewDidLoad

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(autoPage:) name:@"H2RAutoPage" object:nil];

我的 AutoPage 例程看起来像这样

- (void)autoPage: (NSNotification *)notification
{
//get current index of current page
  NSUInteger currentPage = [self.modelController indexOfViewController:[self.pageViewController.viewControllers objectAtIndex:0]];
// this is the next page nil mean we have reach the end
  H2RDataViewController *targetPageViewController = [self.modelController viewControllerAtIndex:(currentPage + 1) storyboard:self.storyboard];
  if (targetPageViewController) {
      //put it(or them if in landscape view) in an array
       NSArray *viewControllers = [NSArray arrayWithObjects:targetPageViewController, nil];
      //add page view
      [self.pageViewController setViewControllers:viewControllers  direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
  }

}

我也尝试过使用委托，但发现代码变得混乱，因为它不断失去委托，我发现 NSnotification 更干净。

于 2013-05-08T07:56:26.007 回答