Question

在AppDelegate中，只要收到VoIP呼叫（推送通知），就会调用以下函数，从而创建＆＃34; VideoCallViewController＆＃34;

的多个实例

我已经使用了deinit（在VideoCallViewController中），如下所示，检查以前的＆＃34; VideoCallViewController＆＃34;在一个新的＆＃34; VideoCallViewController＆＃34;的实例之前被去初始化了。创建后，令我惊讶的是print("Deinitializing VC)没有被调用，将实例留在内存中。

如果AppDelegate中已存在VideoCallViewController实例，如何向其中显示VideoCallViewController及其导航控制器。

在VideoCallViewController中

deinit {
  print("Deinitializing VC)
}

在AppDelegate

func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, forType type: PKPushType) {

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    videoVC = storyboard.instantiateViewController(withIdentifier: "VideoCallViewController") as! VideoCallViewController

    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = videoVC
    self.window?.makeKeyAndVisible()

}

Answer 1

您可以在AppDelegate中创建一个懒惰的变种

lazy var videoVC: UIViewController = {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    return storyboard.instantiateViewController(withIdentifier: "VideoCallViewController")
}()

然后在你的pushRegistry中：

func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, forType type: PKPushType) {

    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = self.videoVC
    self.window?.makeKeyAndVisible()

}

Answer 2

可能的解决方案：创建包含可空窗口的单例控件，负责视频调用流程。在通知上更改可见窗口。在通话结束时 - 返回应用程序主窗口。

E.G。：

class VideoCallManager {
    //MARK: - Singleton
    static let sharedInstance = VideoCallManager()
    private init() {}

    private var videoCallWindow: UIWindow?

    func navigateToVideoCallViewController() {
        if let window = self.videoCallWindow, window.keyWindow {
             //VideoCallViewController is displayed at the moment.
             return
        }

        videoCallWindow = UIWindow.init(frame: UIScreen.mainScreen().bounds)
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        videoVC = storyboard.instantiateViewController(withIdentifier: "VideoCallViewController") as! VideoCallViewController

        self.videoCallWindow?.rootViewController = videoVC
        self.videoCallWindow?.makeKeyAndVisible()
    }

    func returnToWindowOfAppDelegate() {
        if let window = self.videoCallWindow, window.keyWindow {
            (UIApplication.sharedApplication().delegate as? AppDelegate)?.window?.makeKeyAndVisible()

            self.videoCallWindow = nil
        }
    }
}

你的方法看起来像：

func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, forType type: PKPushType) {
    VideoCallManager.sharedInstance.navigateToVideoCallViewController()
}

避免创建多个ViewController实例，iOS Swift

2 个答案: