ios - 在 UINavigationController 中仅支持一个 View 的横向

Question

我有一个导航 Controller ，它有几个 View Controller 。我需要支持所有 View Controller 的所有方向，除了一个只支持横向的特殊 View Controller 。这个特殊的 View Controller 出现在导航堆栈的中间。我做了很多研究，但找不到任何好的解决方案。以下是我已阅读和尝试过的链接。

http://www.iphonedevsdk.com/forum/iphone-sdk-development/3219-force-landscape-mode-one-view.html#post60435

How to rotate screen to landscape?

How to autorotate from portrait to landscape mode? iPhone - allow landscape orientation on just one viewcontroller http://goodliffe.blogspot.com/2009/12/iphone-forcing-uiview-to-reorientate.html

接下来我将尝试用 presentModalViewController 替换导航 Controller 以显示特殊 View Controller 。然后我将在特殊 View Controller 中创建一个新的导航 View Controller 来推送后续的 View Controller 。

如果有人有更好的想法，请告诉我。非常感谢!

更新:我已经成功地使用了我上面描述的方法:将 pushViewController 替换为 presentModalViewController 并创建一个新的导航 Controller 。

Answer 1

每个推送到导航 Controller 堆栈上的 View Controller 都必须支持相同的方向。这意味着不可能让一些 View Controller 只支持纵向，而另一些只支持横向。换句话说，同一个导航 Controller 堆栈上的所有 View Controller 都应该在委托(delegate)中返回相同的值:

(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

但是有一个简单的解决方案!这是一个从肖像到风景的例子。以下是执行此操作的步骤，下面是支持它的代码。

1. 创建一个“假” View Controller ，它将作为子导航 Controller 的根。此 View Controller 应支持横向。
2. 创建 UINavigationController 的新实例，将“假” View Controller 的实例添加为根，将横向 View Controller 的实例添加为第二个 View Controller
3. 将 UINavigationController 实例作为父 View Controller 的模态呈现

首先，使用以下代码创建一个新的 View Controller (FakeRootViewController):

@interface FakeRootViewController : UIViewController
@property (strong, nonatomic) UINavigationController* parentNavigationController;
@end

@implementation FaceRootViewController
@synthesize parentNavigationController;
// viewWillAppear is called when we touch the back button on the navigation bar
(void)viewWillAppear:(BOOL)animated {
  // Remove our self from modal view though the parent view controller
  [parentNavigationController dismissModalViewControllerAnimated:YES];
}
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
   return (interfaceOrientation == UIInterfaceOrientationIsLandscape(interfaceOrientation));
} 

这里是呈现您希望在横向模式下显示的 View Controller 的代码:

FakeRootViewController* fakeRootViewController = [[FakeRootViewController alloc] init];[fakeRootViewController.navigationItem setBackBarButtonItem:backButton]; // Set back button
// The parent navigation controller is the one containing the view controllers in portrait mode.
fakeRootViewController.parentNavigationController = parentNavigationController;

UINavigationController* subNavigationController = // Initialize this the same way you have initialized your parent navigation controller.

UIViewController* landscapeViewController = // Initialize the landscape view controller

[subNavigationController setViewControllers:
   [NSArray arrayWithObjects:fakeRootViewController, 
                                               landscapeViewController, nil] animated:NO];

[_navigationController presentModalViewController:subNavigationController animated:YES];

记住 landscapeViewController 也应该有这个实现:

(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
   return (interfaceOrientation == UIInterfaceOrientationIsLandscape(interfaceOrientation));
}