Xcode Apple Watch 项目，未显示本地通知？

Question

我正在尝试在带有按钮的 Apple Watch 模拟器上显示本地通知。这是代码：

@IBAction func buttonOne() {

    print("button one pressed")

    let content = UNMutableNotificationContent()
    content.title = NSString.localizedUserNotificationString(forKey: "Notified!", arguments: nil)
    content.body = NSString.localizedUserNotificationString(forKey: "This is a notification appearing!", arguments: nil)

    // Deliver the notification in five seconds.
    content.sound = UNNotificationSound.default()
    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5,
                                                    repeats: false)
    // Schedule the notification.
    let request = UNNotificationRequest(identifier: "Notify", content: content, trigger: trigger)

    center.add(request) { (error : Error?) in
        if let theError = error {
            print(theError.localizedDescription)
        } else {
            print("successful notification")
        }
    }

}

控制台正在成功打印“成功通知”，但该通知从未出现在手表模拟器上。我不知道为什么会这样

Answer 1

1) 在安排通知之前，请求权限。使用requestAuthorization方法，例如：

let center = UNUserNotificationCenter.current()
center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
    // Enable or disable features based on authorization
} 

2) 如果应用程序在前台运行，通知将不会出现在表盘上。考虑到这一点，您可以使用 cmd + H 来隐藏应用程序。