在iOS 8中的UISplitViewController的主视图中有一个UINavigationController

2 回答

• 24

  简而言之，您可以通过UISplitViewControllerDelegate方法控制此行为：

  splitViewController:collapseSecondaryViewController:ontoPrimaryViewController:
  splitViewController:separateSecondaryViewControllerFromPrimaryViewController:
  

  我怀疑你真正想做的是处理你有一个基于iOS 8 UISplitViewController的应用程序的情况，你的主要和详细视图都是UINavigationControllers，并且你想要只出现一些viewControllers（在这些导航控制器中）拆分视图的主要部分或细节部分 . 以下答案涉及此问题 . 它还可以处理您有时希望视图替换Detail导航控制器中的视图而不是被推到那里的情况 .

  一个小警告：下面的代码不处理所有可能的情况，并有一些假设：

  • 当拆分拆分视图并且这些视图被其上方的详细视图遮挡时，我们预计详细导航控制器堆栈上的任何内容都不会发生变化 .

  • 我们的UIViewController子类都有一个shouldDisplayInDetailedView和shouldReplaceDetailedView属性

  • 我们假设我们只将视图推送到具有shouldDisplayInDetailedView属性集的详细导航控制器 .

  • 视图控制器通过splitViewController添加到Detail端：showDetailViewController：或pushViewController：animated：在详细视图中的视图的navigationController属性上（处于展开或折叠状态） .

  • 应该替换Detail导航控制器中的视图控制器的视图控制器只能通过splitViewController：showDetailViewController添加：并且只能通过与主视图控制器中的视图的交互添加，即，只有在主视图控制器未被遮挡时才会发生这种情况 . 崩溃的国家 .

  • 当拆分视图控制器扩展时，我们有一个BlankViewController在详细信息视图中显示，但我们只有视图控制器应保留在主端 .

  我不建议只实现splitViewController的一面：collapseSecondaryViewController：ontoPrimaryViewController：/ splitViewController：separateSecondaryViewControllerFromPrimaryViewController：logic并取决于另一方的默认实现 . Apple做了一些奇怪的事情，例如将UINavigationViewController从Detail端放入主要侧作为Primary导航控制器堆栈中的一个viewControllers，然后将其他视图控制器推到它上面，即使你完全理解仍然无法复制你自己的代码 . 因此，最好自己处理这两个过程 .

  这是我使用的：

  #pragma mark -
  #pragma mark Split View Controller delegate.
  
  - (BOOL)splitViewController:(UISplitViewController *)splitViewController showViewController:(UIViewController *)vc sender:(id)sender
  {
      //Standard behaviour.  This won't get called in our case when the split view is collapsed and the primary view controllers are obscured.
      return NO;
  }
  
  // Since we treat warnings as errors, silence warning about unknown selector below on UIViewController subclasses.
  #pragma GCC diagnostic ignored "-Wundeclared-selector"
  
  
  - (BOOL)splitViewController:(UISplitViewController *)splitViewController showDetailViewController:(UIViewController *)vc sender:(id)sender
  {
      if (splitViewController.collapsed == NO)
      {
          // The navigation controller we'll be adding the view controller vc to.
          UINavigationController *navController = splitViewController.viewControllers[1];
  
          UIViewController *topDetailViewController = [navController.viewControllers lastObject];
          if ([topDetailViewController isKindOfClass:[BlankViewController class]] ||
             ([vc respondsToSelector:@selector(shouldReplaceDetailedView)] && [vc performSelector:@selector(shouldReplaceDetailedView)]))
          {
              // Replace the (expanded) detail view with this new view controller.
              [navController setViewControllers:@[vc] animated:NO];
          }
          else
          {
              // Otherwise, just push.
              [navController pushViewController:vc animated:YES];
          }
      }
      else
      {
          // Collapsed.  Just push onto the conbined primary and detailed navigation controller.
          UINavigationController *navController = splitViewController.viewControllers[0];
          [navController pushViewController:vc animated:YES];
      }
  
      // We've handled this ourselves.
      return YES;
  }
  
  - (BOOL)splitViewController:(UISplitViewController *)splitViewController collapseSecondaryViewController:(UIViewController *)secondaryViewController ontoPrimaryViewController:(UIViewController *)primaryViewController
  {
      UINavigationController *primaryNavController = (UINavigationController *)primaryViewController;
      UINavigationController *secondaryNavController = (UINavigationController *)secondaryViewController;
      UIViewController *bottomSecondaryView = [secondaryNavController.viewControllers firstObject];
      if ([bottomSecondaryView isKindOfClass:[BlankViewController class]])
      {
          NSAssert([secondaryNavController.viewControllers count] == 1, @"BlankViewController is not only detail view controller");
          // If our secondary controller is blank, do the collapse ourself by doing nothing.
          return YES;
      }
  
      // We need to shift these view controllers ourselves.
      // This should be the primary views and then the detailed views on top.
      // Otherwise the UISplitViewController does wacky things like embedding a UINavigationController inside another UINavigation Controller, which causes problems for us later.
      NSMutableArray *newPrimaryViewControllers = [NSMutableArray arrayWithArray:primaryNavController.viewControllers];
      [newPrimaryViewControllers addObjectsFromArray:secondaryNavController.viewControllers];
      primaryNavController.viewControllers = newPrimaryViewControllers;
  
      return YES;
  }
  
  - (UIViewController *)splitViewController:(UISplitViewController *)splitViewController separateSecondaryViewControllerFromPrimaryViewController:(UIViewController *)primaryViewController
  {
      UINavigationController *primaryNavController = (UINavigationController *)primaryViewController;
  
      // Split up the combined primary and detail navigation controller in their component primary and detail view controller lists, but with same ordering.
      NSMutableArray *newPrimaryViewControllers = [NSMutableArray array];
      NSMutableArray *newDetailViewControllers = [NSMutableArray array];
      for (UIViewController *controller in primaryNavController.viewControllers)
      {
          if ([controller respondsToSelector:@selector(shouldDisplayInDetailedView)] && [controller performSelector:@selector(shouldDisplayInDetailedView)])
          {
              [newDetailViewControllers addObject:controller];
          }
          else
          {
              [newPrimaryViewControllers addObject:controller];
          }
      }
  
      if (newDetailViewControllers.count == 0)
      {
          // If there's no detailed views on the top of the navigation stack, return a blank view  (in navigation controller) for detailed side.
          UINavigationController *blankDetailNavController = [[UINavigationController alloc] initWithRootViewController:[[BlankViewController alloc] init]];
          return blankDetailNavController;
      }
  
      // Set the new primary views.
      primaryNavController.viewControllers = newPrimaryViewControllers;
  
      // Return the new detail navigation controller and views.
      UINavigationController *detailNavController = [[UINavigationController alloc] init];
      detailNavController.viewControllers = newDetailViewControllers;
      return detailNavController;
  }
  

  回复于 2024-05-06T11:45:01+08:00
• 0

  Swift 4版本稍作修改，使其与我的代码一起使用：

  func splitViewController(_ splitViewController: UISplitViewController, showDetail vc: UIViewController, sender: Any?) -> Bool {
      if !isCollapsed {
          // in expanded mode set new VC as top view controller of the detail nav controller
          if let detailNavigationController = viewControllers[1] as? UINavigationController {
             detailNavigationController.setViewControllers([vc], animated: false)
          }
      } else {
          // in collapsed mode push the new view controller on the master nav controller
          if let masterNavigationController = viewControllers[0] as? UINavigationController {
              masterNavigationController.pushViewController(vc, animated: true)
          }
      }
      return true
  }
  
  func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool {
  
      let masterNavigationController = primaryViewController as? UINavigationController
      let detailNavigationController = secondaryViewController as? UINavigationController
      let episodeDetailViewController = detailNavigationController?.viewControllers.first as? EpisodeDetailTableViewController
      if episodeDetailViewController?.episode == nil {
          // detail view is blank. We do not need to push this onto the master
          return true
      }
  
      guard var newMasterViewControllers = masterNavigationController?.viewControllers else { return false }
      newMasterViewControllers.append(contentsOf: detailNavigationController?.viewControllers ?? [])
      masterNavigationController?.setViewControllers(newMasterViewControllers, animated: false)
      return true
  }
  
  
  func splitViewController(_ splitViewController: UISplitViewController, separateSecondaryFrom primaryViewController: UIViewController) -> UIViewController? {
      let masterNavigationViewController = primaryViewController as? UINavigationController
  
      var newMasterViewControllers = [UIViewController]()
      var newDetailViewControllers = [UIViewController]()
  
      for vc in masterNavigationViewController?.viewControllers ?? [] {
          if vc is PodcastsTableViewController || vc is EpisodesTableViewController {
              newMasterViewControllers.append(vc)
          } else {
              newDetailViewControllers.append(vc)
          }
      }
  
      let storyboard = UIStoryboard(name: "Main", bundle: nil)
      let detailNavigationController = storyboard.instantiateViewController(withIdentifier: "splitViewDetailViewController") as! UINavigationController
  
      if newDetailViewControllers.count == 0 {
          let emptyEpisodeDetailViewController = storyboard.instantiateViewController(withIdentifier: "episodeDetail")
          newDetailViewControllers.append(emptyEpisodeDetailViewController)
      }
  
      masterNavigationViewController?.setViewControllers(newMasterViewControllers, animated: false)
      detailNavigationController.setViewControllers(newDetailViewControllers, animated: false)
      return detailNavigationController
  }
  

  回复于 2024-05-06T11:45:01+08:00