Question

所以我花了最后5-6个小时试图让这一功能起作用，我在实现和理解限制方面遇到了一些陷阱。我尝试了几种方法：

方法1：

func applicationWillEnterForeground(_ application: UIApplication) {

    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    self.window = UIWindow(frame: UIScreen.main.bounds)
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    var vc : UIViewController

    vc = storyboard.instantiateViewController(withIdentifier: "PasscodeLockVC")

    self.window?.rootViewController = vc
    self.window?.makeKeyAndVisible()
    print("app entered foreground")

}

问题：我无法从PasscodeLockVC中删除屏幕（它是密码VC）。

方法2：

public extension UIViewController {
func show() {
    let win = UIWindow(frame: UIScreen.main.bounds)
    let vc = UIViewController()
    vc.view.backgroundColor = .clear
    win.rootViewController = vc
    win.windowLevel = UIWindowLevelAlert + 1
    win.makeKeyAndVisible()
    vc.present(self, animated: true, completion: nil)
}

func hide() {
    dismiss(animated: true, completion: nil)
}

}

问题：我解雇时会出现黑屏。

**所以我的问题是**有人可以指导我进入前台时锁定屏幕的最佳方法（我知道它在applicationWillEnterForegroud中），但是当我这样做时，它会保留活动的屏幕当应用程序关闭时（因为它是日记应用程序，它将是所有内容）吗？我整天都难过，真的可以用一些方向。

在最新的Xcode上运行

从app delegate到顶部的viewcontroller

0 个答案: