Question

我有出租车管理应用程序，其中从 UIViewcontroller 扩展了一个名为 corecontroller 的类以使用所有常用功能。在这里，我们添加了通知观察器和卸妆器

override func viewDidAppear(_ animated: Bool) {
    //registering gcm reciever
    super.viewDidAppear(animated)
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(showReceivedGCMMessageCore(_:)),
                                           name: NSNotification.Name(rawValue: appDelegate.messageKey), object: nil)
}
override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
     NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: appDelegate.messageKey), object: nil)
}

在 MyViewController

中

class MyViewController: Corecontroller{
  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
  }
  override func viewDidDisappear(_ animated: Bool) {
     super.viewDidDisappear(animated)
 }
}

当FCM到达时，它将取消 corecontroller 内部的功能，因为功能之一是从扩展的corecontroller中打开一个页面，说 AcceptReqeustViewcontroller ，在此当用户接受请求时，AcceptReqeustViewcontroller 需要撤回给ViewController，所以我做到了

let appDelegate = UIApplication.shared.delegate as! AppDelegate
    let rootController   = kStoryBoard.main.instantiateViewController(withIdentifier:kViewControllers.mainPage) as! MainViewController

    appDelegate.window?.rootViewController = rootController

    self.view.window?.rootViewController?.dismiss(animated: true, completion: nil)

将新的viewcontroller初始化为rootviewcontroller并关闭，但是在这种情况下，要执行的 MyViewController viewDidAppear()函数只是想知道为什么会这样？

当调用self.view.window？.rootViewController？.dismiss（animated：true，complete：nil）时，viewDidAppear会被调用

0 个答案: