调用快速操作时不触发NotificationCenter

Question

在AppDelegate中调用函数AppDelegate时，我在应用程序中实现了3D触摸快速动作，内部由NotificationCenter触发，但不工作和调用

我在AppDelegate中的代码

func application(_ application: UIApplication, performActionFor 
shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping 
(Bool) -> Void) {


    NotificationCenter.default.post(name: Notification.Name("action"), object: nil);

}        

并使用它ViewController

override func viewDidLoad() {
    super.viewDidLoad();


    NotificationCenter.default.addObserver(self, selector: #selector(BaseViewController.didReceiveNotification), name: Notification.Name("action"), object: nil);
}

func didReceiveNotification() {
    let alert = UIAlert(viewController: self);
    alert.content = "NotificationCenter Worked";
    alert.title = "NotificationCenter here!!";
    alert.show();
}

Answer 1

问题是ViewController还没有加载，所以观察者还没有添加到其中。

 NotificationCenter.default.addObserver(self, selector: #selector(BaseViewController.didReceiveNotification), name: Notification.Name("action"), object: nil);

您可以尝试在performActionForshortcutItem中设置一个布尔值，并在viewDidAppear of ViewController中检查它。

Answer 2

您的问题就像Sh_Khan说的，您不能在AppDelegate上发布到ViewController，因为此时您的ViewController没有订阅通知.

你需要这样做：

在你的AppDelegate里

    func application(_ application: UIApplication, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping(Bool) -> Void) {
            UserDefaults.standard.set(true, forKey: "openedByShortcutAction")
            UserDefaults.standard.synchronize()
        }

在ViewController中：

override func viewDidLoad() {
        super.viewDidLoad()
        if (UserDefaults.standard.bool(forKey: "openedByShortcutAction")) {
            //Your App has been started by selecting your Shortcut Action
        }
    }