我正在使用 ARKit,我希望允许用户在纵向和横向模式下使用该应用程序。
除了 ARSCNView
之外,我希望所有 UI 控件都在方向更改时旋转。
我试图将 sceneView 变换到相反的方向,但没有成功。
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
let targetRotation = coordinator.targetTransform
let inverseRotation = targetRotation.inverted()
coordinator.animate(alongsideTransition: { (context) in
self.sceneView.transform = self.sceneView.transform.concatenating(inverseRotation)
context.viewController(forKey: UITransitionContextViewControllerKey.from)
}, completion: nil)
}
如何防止 ARKit session 的场景 View 旋转,同时允许所有其他 UI 控件在方向更改时旋转?
最佳答案
您不能在 View 基础上指定设备旋转规则。它必须在 View Controller 的基础上设置。这就是 iOS 的工作原理。因此,要实现您的需要,您必须自己处理。例如,如果您将 ARSCNView
显示为全屏 View ,则可以在自定义 UIViewController
子类中显示它,并为其设置旋转配置 Controller 。
为特定 View Controller 设置支持的 View 旋转可以通过多种方式实现,下面是其中的一些。
方法#1:
您可以通过重写应用委托(delegate)的方法 application:supportedInterfaceOrientationsForWindow:
为任何 UIViewController
设置支持的 View 方向。
示例代码:
// this goes into your AppDelegate...
// Basically, this checks the current visible view controller type and decide
// what orientations your app supports based on that view controller type (class)
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
let visibleViewController = self.topViewController(withRootViewController: window?.rootViewController)
// Support only portrait orientation for a specific view controller
if visibleViewController is SomeViewController {
return .portrait
}
// Otherwise, support all orientations (standard behaviour)
return .allButUpsideDown
}
// This simple helper method is to extract the exact visible view controller at
// the moment, as `window.rootViewController` could have some container controller
// like `UINavigationController` or so that holds more controllers into it
private func topViewController(withRootViewController rootViewController: UIViewController?) -> UIViewController? {
if let rootViewController = rootViewController as? UITabBarController {
return rootViewController.selectedViewController
} else if let rootViewController = rootViewController as? UINavigationController {
return rootViewController.visibleViewController
} else if let presentedViewController = rootViewController?.presentedViewController {
return topViewController(withRootViewController: presentedViewController)
}
return rootViewController
}
引用:
application:supportedInterfaceOrientationsForWindow:
method documentation
方法 #2:
子类化您的 UINavigationController
并覆盖以下属性:
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return self.topViewController?.supportedInterfaceOrientations ?? .all
}
现在这总是查看您的 View Controller 的 supportedInterfaceOrientations
并根据返回值设置支持的方向。这样做可以让您在任何您想要的 View Controller 中简单地覆盖它,设置一些自定义值。
例如,在 SomeViewController
中,您可以简单地添加:
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return .portrait
}
引用:
supportedInterfaceOrientations
property documentation
方法#3:
如果您不想像上面的方法 #2 那样子类化您的 UINavigationController
,您可以将您的 SomeViewController
设置为实现 的导航 Controller 委托(delegate)navigationControllerSupportedInterfaceOrientations(:)
示例代码:
override func viewDidLoad() {
super.viewDidLoad()
// ...
self.navigationController?.delegate = self
}
// MARK: - UINavigationControllerDelegate
func navigationControllerSupportedInterfaceOrientations(_ navigationController: UINavigationController) -> UIInterfaceOrientationMask {
return navigationController.topViewController?.supportedInterfaceOrientations ?? .all
}
引用:
关于ios - 如何防止 ARSCNView 在方向更改期间旋转,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46555009/