在应用程序处于前台Swift 3时获取本地通知以显示

小编典典

在应用程序处于前台Swift 3时获取本地通知以显示

swift

显然，现在ios10可以实现：

optional func userNotificationCenter(_ center: UNUserNotificationCenter, 
                 willPresent notification: UNNotification, 
  withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)

这个答案基本上说完成此任务所需的工具：

当您的应用处于打开状态且处于前台时，是否显示股票iOS通知横幅？

我只是不太了解如何将所有内容放在一起。

我不知道这有多重要，但是我无法保留可选的func，而xcode希望我将其切换为私有。

我正在尝试显示徽章，并且文档提供了

static var badge: UNNotificationPresentationOptions { get }

有点丢在这里。

然后我假设是否要从获取这些徽章中排除某个视图控制器，并且我没有使用导航控制器，那么我发现的这段代码行得通吗？：var window：UIWindow？

if let viewControllers = window?.rootViewController?.childViewControllers {
for viewController in viewControllers {
    if viewController.isKindOfClass(MyViewControllerClass) {
        print("Found it!!!")
        }
    }
}

阅读 533

2020-07-07

共1个答案

小编典典

有一种委托方法可在iOS 10中打开应用程序时显示通知。您必须实现此方法，才能在应用程序打开时使丰富的通知正常工作。

extension ViewController: UNUserNotificationCenterDelegate {

    //for displaying notification when app is in foreground
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

        //If you don't want to show notification when app is open, do something here else and make a return here. 
        //Even you you don't implement this delegate method, you will not see the notification on the specified controller. So, you have to implement this delegate and make sure the below line execute. i.e. completionHandler.

        completionHandler([.alert, .badge, .sound]) 
    }

    // For handling tap and user actions
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        switch response.actionIdentifier {
        case "action1":
            print("Action First Tapped")
        case "action2":
            print("Action Second Tapped")
        default:
            break
        }
        completionHandler()
    }

}

为了在iOS 10中安排通知并提供徽章

override func viewDidLoad() {
    super.viewDidLoad()

    // set UNUserNotificationCenter delegate to self
    UNUserNotificationCenter.current().delegate = self
    scheduleNotifications()
}

func scheduleNotifications() {

    let content = UNMutableNotificationContent()
    let requestIdentifier = "rajanNotification"

    content.badge = 1
    content.title = "This is a rich notification"
    content.subtitle = "Hello there, I am Rajan Maheshwari"
    content.body = "Hello body"
    content.categoryIdentifier = "actionCategory"
    content.sound = UNNotificationSound.default

    // If you want to attach any image to show in local notification
    let url = Bundle.main.url(forResource: "notificationImage", withExtension: ".jpg")
    do {
        let attachment = try? UNNotificationAttachment(identifier: requestIdentifier, url: url!, options: nil)
        content.attachments = [attachment!]
    }

    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 3.0, repeats: false)

    let request = UNNotificationRequest(identifier: requestIdentifier, content: content, trigger: trigger)
    UNUserNotificationCenter.current().add(request) { (error:Error?) in

        if error != nil {
            print(error?.localizedDescription ?? "some unknown error")
        }     
        print("Notification Register Success")
    }
}

为了在AppDelegate中注册，我们必须在 didFinishLaunchingWithOptions

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        registerForRichNotifications()
        return true
    }

我也在这里定义了动作。您可以跳过它们

func registerForRichNotifications() {

       UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.badge,.sound]) { (granted:Bool, error:Error?) in
            if error != nil {
                print(error?.localizedDescription)
            }
            if granted {
                print("Permission granted")
            } else {
                print("Permission not granted")
            }
        }

        //actions defination
        let action1 = UNNotificationAction(identifier: "action1", title: "Action First", options: [.foreground])
        let action2 = UNNotificationAction(identifier: "action2", title: "Action Second", options: [.foreground])

        let category = UNNotificationCategory(identifier: "actionCategory", actions: [action1,action2], intentIdentifiers: [], options: [])

        UNUserNotificationCenter.current().setNotificationCategories([category])

    }

如果希望将通知标题显示在整个应用程序中的任何位置，则可以编写UNUserNotificationDelegatein
的委托AppDelegate并使UNUserNotificationCenter当前委托成为AppDelegate

extension AppDelegate: UNUserNotificationCenterDelegate {

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        print(response.notification.request.content.userInfo)
        completionHandler()
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .badge, .sound]) 
    }
}

这是输出

2020-07-07