我的VC就像一个“出了问题”。我创建的这个VC像一个单独的VC（没有故事板），我想在我想要的地方展示它。但在“something wating expect”视图控制器中，我有一个按钮“refreship”。当用户点击此按钮时，他必须返回。
当我在解析Json或类似的事情时遇到一些问题时，我会调用something went English“View Controller，如下所示:
let navController = UINavigationController()
navController.pushViewController(SomethingWentWorngVC(nibName: "SomethingWentWorngView", bundle: nil), animated: false)
window?.rootViewController = navController
window?.makeKeyAndVisible()
此外，我还有获取
extension UIViewController {
var appDelegate: AppDelegate {
return UIApplication.shared.delegate as! AppDelegate
}
var sceneDelegate: SceneDelegate? {
guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
let delegate = windowScene.delegate as? SceneDelegate else { return nil }
return delegate
}
}
extension UIViewController {
var window: UIWindow? {
if #available(iOS 13, *) {
guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
let delegate = windowScene.delegate as? SceneDelegate, let window = delegate.window else { return nil }
return window
}
guard let delegate = UIApplication.shared.delegate as? AppDelegate, let window = delegate.window else { return nil }
return window
}
}
在
@IBAction func refreshAction(_ sender: Any) {
self.navigationController?.popToRootViewController(animated: false)
}
但它不起作用
你可以用这种替代的方式来使用它，首先你需要在appdelegate中使用tag创建公共代码，然后你需要做addsubview到window，例如，
作秀
func showWentWrongScreen(){
let getVC = SomethingWentWorngVC
if let getWindow = self.window {
getVC.view.tag = 501
getVC.view.frame = getWindow.bounds
getWindow.addSubview(getVC.view)
}
}
用于删除
func removeWentWrongScreen(){
if let getWindow = self.window, let getWentWrongView = getWindow.viewWithTag(501){
getWentWrongView.removeFromSuperview()
}
}
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