iOS13 external screen mirroring, getting error: setScreen should not be called
iOS13 external screen mirroring, getting error: setScreen should not be called
我试图在 iOS 13 中向外部连接的屏幕显示自定义视图控制器。我遵循了本教程:
我有以下代码:
/// A private method used to setup a external screen with a window
/// loaded with a ExternalScreenViewController
///
/// - parameter screen: A UIScreen object to connect the
/// ExternalScreenViewController too
private func setupExternalScreen(screen: UIScreen) {
guard externalWindow == nil,
let vc = self.storyboard?.instantiateViewControllerWithIdentifier("ExternalScreen") as? ExternalScreenViewController else {
return
}
externalWindow = UIWindow(frame: screen.bounds)
externalWindow!.rootViewController = vc
externalWindow!.screen = screen
externalWindow!.hidden = false
}
在 externalWindow!.screen = screen
行中,我在 Xcode 11.4.1 控制台中收到错误消息:
[断言] UIKit 客户端错误:-如果客户端采用 UIScene 生命周期,则不应调用 [UIWindow setScreen:]。改为调用 -[UIWindow setWindowScene:]。
自定义视图控制器未显示在外部显示器中。
我应该改变什么?我想同时处理 iOS 13.x 和以前的设备。
在iOS 13 个设备中,您应该在externalWindow
对象上设置windowScene
而不是设置screen
。在此之前,您应该从UIApplication
的连接场景中找出匹配的windowScene
。修改后的方法如下:
private func setupExternalScreen(screen: UIScreen, shouldRecurse: Bool = true) {
// For iOS13 find matching UIWindowScene
var matchingWindowScene: UIWindowScene? = nil
if #available(iOS 13.0, *) {
let scenes = UIApplication.shared.connectedScenes
for aScene in scenes {
if let windowScene = aScene as? UIWindowScene {
// Look for UIWindowScene that has matching screen
if (windowScene.screen == screen) {
matchingWindowScene = windowScene
break
}
}
}
if matchingWindowScene == nil {
// UIWindowScene has not been created by iOS rendered yet
// Lets recall self after delay of two seconds
if true == shouldRecurse {
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {
self.setupExternalScreen(screen:screen, shouldRecurse: false)
}
}
// Dont proceed furthure in iOS13
return
}
}
guard externalWindow == nil, let vc = self.storyboard?.instantiateViewControllerWithIdentifier("ExternalScreen") as? ExternalScreenViewController else {
return
}
externalWindow = UIWindow(frame: screen.bounds)
externalWindow!.rootViewController = vc
if #available(iOS 13.0, *) {
// Set windowScene here, no need to set screen
externalWindow!.windowScene = matchingWindowScene
} else {
// Set screen the traditional way
externalWindow!.screen = screen
}
externalWindow!.isHidden = false
}
注意:我们应该设置 isHidden
,因为 hidden
已弃用。
我试图在 iOS 13 中向外部连接的屏幕显示自定义视图控制器。我遵循了本教程:
我有以下代码:
/// A private method used to setup a external screen with a window
/// loaded with a ExternalScreenViewController
///
/// - parameter screen: A UIScreen object to connect the
/// ExternalScreenViewController too
private func setupExternalScreen(screen: UIScreen) {
guard externalWindow == nil,
let vc = self.storyboard?.instantiateViewControllerWithIdentifier("ExternalScreen") as? ExternalScreenViewController else {
return
}
externalWindow = UIWindow(frame: screen.bounds)
externalWindow!.rootViewController = vc
externalWindow!.screen = screen
externalWindow!.hidden = false
}
在 externalWindow!.screen = screen
行中,我在 Xcode 11.4.1 控制台中收到错误消息:
[断言] UIKit 客户端错误:-如果客户端采用 UIScene 生命周期,则不应调用 [UIWindow setScreen:]。改为调用 -[UIWindow setWindowScene:]。
自定义视图控制器未显示在外部显示器中。
我应该改变什么?我想同时处理 iOS 13.x 和以前的设备。
在iOS 13 个设备中,您应该在externalWindow
对象上设置windowScene
而不是设置screen
。在此之前,您应该从UIApplication
的连接场景中找出匹配的windowScene
。修改后的方法如下:
private func setupExternalScreen(screen: UIScreen, shouldRecurse: Bool = true) {
// For iOS13 find matching UIWindowScene
var matchingWindowScene: UIWindowScene? = nil
if #available(iOS 13.0, *) {
let scenes = UIApplication.shared.connectedScenes
for aScene in scenes {
if let windowScene = aScene as? UIWindowScene {
// Look for UIWindowScene that has matching screen
if (windowScene.screen == screen) {
matchingWindowScene = windowScene
break
}
}
}
if matchingWindowScene == nil {
// UIWindowScene has not been created by iOS rendered yet
// Lets recall self after delay of two seconds
if true == shouldRecurse {
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {
self.setupExternalScreen(screen:screen, shouldRecurse: false)
}
}
// Dont proceed furthure in iOS13
return
}
}
guard externalWindow == nil, let vc = self.storyboard?.instantiateViewControllerWithIdentifier("ExternalScreen") as? ExternalScreenViewController else {
return
}
externalWindow = UIWindow(frame: screen.bounds)
externalWindow!.rootViewController = vc
if #available(iOS 13.0, *) {
// Set windowScene here, no need to set screen
externalWindow!.windowScene = matchingWindowScene
} else {
// Set screen the traditional way
externalWindow!.screen = screen
}
externalWindow!.isHidden = false
}
注意:我们应该设置 isHidden
,因为 hidden
已弃用。