调用快速操作时不触发 NotificationCenter

NotificationCenter not trigger when call Quick Action

我在 AppDelegate 中调用函数 performActionForShortcutItem 时在应用程序中实现了 3D Touch Quick Action,我在其中通过 NotificationCenter 触发但无法调用

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();
}

问题是 ViewController 尚未加载,因此尚未添加观察者

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

你可以尝试在performActionForshortcutItem里面设置一个布尔值,然后在ViewController

的viewDidAppear里面查看

你的问题就像 Sh_Khan 说的那样,你不能 post 在 AppDelegate 上 ViewController,因为此时你的 ViewController 没有订阅到通知...

你需要做这样的事情:

在您的 AppDelegate 中

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

在你的ViewController中:

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