iOS 5.1 UISplitviewcontroller 不允许来自 RootViewController 的 presentModalViewController

Question

我使用以下代码显示来自 splitviewcontroller 的 RootViewcontroller 的 viewcontroller。它不会在 iOS 5.1 纵向模式下显示任何内容。当横向显示 Rootviewcontroller 内的 Controller 。它在 iOS 5.0 之前运行良好。

-(void)displayFileInReader:(NSURL *)fileURL    {

    SPDocumentReader *objiPadDocumentReader = [[SPDocumentReader alloc] init];
    objiPadDocumentReader.readerType = ReaderTypeLocalCachedDocument;
    objiPadDocumentReader.url = fileURL;
    UINavigationController *objNavigationController = [[UINavigationController alloc] initWithRootViewController:objiPadDocumentReader];
    objNavigationController.navigationBar.barStyle = UIBarStyleBlack;

    [self presentModalViewController:objNavigationController animated:YES];

    [objNavigationController release];
    objNavigationController = nil;

    [objiPadDocumentReader release];
    objiPadDocumentReader = nil;
}

我使用 self.splitviewcontroller 并使用 detailviewcontroller instance 而不是 self。

但在这种情况下，当我们单击 detailview controller 以关闭/删除 rootviewcontroller 时，它会导致崩溃，并显示类似“没有 View 窗口”之类的内容。

此外，有时在 iOS 5.1 中，RootView 显示方向错误。

提前致谢

Answer 1

终于找到解决方法了，

我认为问题可能是由于当我们尝试在其上呈现 View Controller 时， Split View无法关闭 Root View Controller 。我把上面的函数改成了这样

-(void)displayFileInReader:(NSURL *)fileURL
{
    SPDocumentReader *objiPadDocumentReader = [[SPDocumentReader alloc] init];
    objiPadDocumentReader.readerType = ReaderTypeLocalCachedDocument;
    objiPadDocumentReader.url = fileURL;
    UINavigationController *objNavigationController = [[UINavigationController alloc] initWithRootViewController:objiPadDocumentReader];
    objNavigationController.navigationBar.barStyle = UIBarStyleBlack;

    //to dismiss the splitview popover -to solve iOS5.1 splitview issue.
    [self.delegate dismissSplitViewPopOverController];

    [self presentModalViewController:objNavigationController animated:YES];

    [objNavigationController release];
    objNavigationController = nil;

    [objiPadDocumentReader release];
    objiPadDocumentReader = nil;
}

我在这里粘贴了允许我找到 Split View弹出窗口的 Split View委托(delegate)。

#pragma mark - UISplitView delegate

// Called when rotating to a portrait orientation.
- (void)splitViewController: (UISplitViewController*)svc
     willHideViewController:(UIViewController *)aViewController
          withBarButtonItem:(UIBarButtonItem*)barButtonItem
       forPopoverController: (UIPopoverController*)pc {

    barButtonItem.title = SPLocaleString(@"[Navigator]");
    self.navigationItem.leftBarButtonItem = barButtonItem;

    splitPopoverController = pc;
    [splitPopoverController retain];
}

// Called when the view is shown again in the split view, invalidating the button and popover controller.
- (void)splitViewController: (UISplitViewController*)svc
     willShowViewController:(UIViewController *)aViewController
  invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {

    self.navigationItem.leftBarButtonItem = nil;

    [splitPopoverController release];
    splitPopoverController = nil;
}

-(void)splitViewController:(UISplitViewController *)svc
         popoverController:(UIPopoverController *)pc
 willPresentViewController:(UIViewController *)aViewController
{
    if (splitPopoverController)
    {
        [splitPopoverController release];
        splitPopoverController = nil;
    }

    splitPopoverController = pc;
    [splitPopoverController retain];
}

- (void)dismissSplitViewPopOverController {
    // If a popover controller is visible, hide it
    if (splitPopoverController) {
        [splitPopoverController dismissPopoverAnimated:NO];
        [splitPopoverController release];
        splitPopoverController = nil;
    } 
}

感谢上帝，