iOS 屏幕旋转的设置方法

NSNumber *orientationTarget = [NSNumber numberWithInteger:isLaunchScreen ? UIInterfaceOrientationLandscapeRight : UIInterfaceOrientationPortrait];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

// ，AppDelegate代理是App启动后的动态更改,可以覆盖启动前的设置，所以它的优先级最大
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    if isLaunchScreen {
        return .landscapeRight
    } else {
        return .portrait
    }
}

// 1.是否支持屏幕旋转，只有返回true, 下面的两个方法才会执行
open var shouldAutorotate: Bool { get }

// 2.页面支持的屏幕方向
@available(iOS 6.0, *)
open var supportedInterfaceOrientations: UIInterfaceOrientationMask { get }

// 3.页面进入时的屏幕方向
@available(iOS 6.0, *)
open var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation { get }

UINavigationController->UIViewController
UINavigationController->UIViewController
UINavigationController->UIViewController
UINavigationController->UIViewController

verride var shouldAutorotate: Bool {
    return ((self.selectedViewController?.shouldAutorotate) != nil)
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    return self.selectedViewController?.supportedInterfaceOrientations
}

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
    return self.selectedViewController?.preferredInterfaceOrientationForPresentation
}

override var shouldAutorotate: Bool {
    return self.topViewController?.shouldAutorotate

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    return self.topViewController.supportedInterfaceOrientations
}

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
    return self.topViewController.preferredInterfaceOrientationForPresentation
}

// ViewController
override var shouldAutorotate: Bool {
    return true
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    return .landscape
}

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
    return .landscapeLeft
}  

/* 
    This method is called when the view controller's view's size is changed by its parent (i.e. for the root view controller when its window rotates or is resized). 
    
    If you override this method, you should either call super to propagate the change to children or manually forward the change to children.
    */
@available(iOS 8.0, *)
func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)

open func layoutSubviews() {
    if UIApplication.shared.statusBarOrientation == UIInterfaceOrientation.landscapeLeft {
        旋转判断
    }
}