弹出视图控制器在 Xcode 11.2.1 中打开后立即关闭

Question

通过使用以下方法调用弹出窗口

func annoucementdisplay()
{
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let ivc = storyboard.instantiateViewController(withIdentifier: "PopUpViewController") as! PopUpViewController
    ivc.modalTransitionStyle = .crossDissolve
    ivc.modalPresentationStyle = .custom
    let quiclvw = UIWindow(frame: UIScreen.main.bounds)
    quiclvw.windowLevel = UIWindow.Level.alert
    quiclvw.rootViewController = UIViewController()
    quiclvw.makeKeyAndVisible()
    let transition = CATransition()
    transition.duration = 1.0
    transition.type = CATransitionType.reveal
    transition.subtype = CATransitionSubtype.fromBottom
    quiclvw.layer.add(transition, forKey: kCATransition)
    quiclvw.rootViewController?.present(ivc, animated: true, completion: nil)
}

它在 Xcode 10.3 中运行良好，但是当我在 Xcode 11.2.1 中运行我的代码时，弹出窗口即将出现，但在打开后立即关闭。

我试过

ivc.modalPresentationStyle = .fullScreen

但它不起作用。

Answer 1

我已经在我的 xCode 11.2 上运行了这段代码，它运行成功。

func annoucementdisplay()
{
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let ivc = storyboard.instantiateViewController(withIdentifier: "PopUpViewController") as! PopUpViewController
    ivc.modalTransitionStyle = .crossDissolve
    ivc.modalPresentationStyle = .custom
    let quiclvw = UIWindow(frame: UIScreen.main.bounds)
    quiclvw.windowLevel = UIWindow.Level.alert
    quiclvw.rootViewController = UIViewController()
    quiclvw.makeKeyAndVisible()
    let transition = CATransition()
    transition.duration = 1.0
    transition.type = CATransitionType.reveal
    transition.subtype = CATransitionSubtype.fromBottom
    quiclvw.layer.add(transition, forKey: kCATransition)
    present(ivc, animated: true, completion: nil)
}