Question

我正在使用Swift 3进行编码，而我只是尝试发送现在的通知而没有任何延迟或间隔。但是通知永远不会被触发。这是我的代码..

ViewController代码

import UserNotifications

class HomeViewController: UIViewController{
    var isGrantedNotificationAccess:Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()

        UNUserNotificationCenter.current().requestAuthorization(
            options: [.alert,.sound,.badge],
            completionHandler: { (granted,error) in
                self.isGrantedNotificationAccess = granted
        })

        if isGrantedNotificationAccess{
            triggerNotification()
        }
    }

    //triggerNotification func goes here
}

触发通知功能：

func triggerNotification(){
    let content = UNMutableNotificationContent()
    content.title = NSString.localizedUserNotificationString(forKey: "Notification Testing", arguments: nil)
    content.body = NSString.localizedUserNotificationString(forKey: "This is a test", arguments: nil)
    content.sound = UNNotificationSound.default()
    content.badge = (UIApplication.shared.applicationIconBadgeNumber + 1) as NSNumber;
    let trigger = UNTimeIntervalNotificationTrigger(
        timeInterval: 1.0,
        repeats: false)

    let request = UNNotificationRequest.init(identifier: "testTriggerNotif", content: content, trigger: trigger)

    let center = UNUserNotificationCenter.current()
    center.add(request)
}

我做错了什么？

Answer 1

您错过了处理，当应用处于前台时，您没有指定通知的外观或显示方式。

在添加通知时设置以下行，以指定您在用户使用应用时显示横幅广告（iOS 10新功能）。

在构建<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/bgcolor" android:orientation="horizontal" android:padding="10dip" > <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="25dip" android:gravity="center" android:textSize="24.5sp" android:visibility="gone" /> <TableLayout android:id="@+id/tableLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:stretchColumns="*" > <TableRow android:id="@+id/locationsRowss" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ffffff" android:gravity="center_horizontal" android:minHeight="40dp" android:weightSum="2" > <TextView android:id="@+id/tvlocation11" android:layout_width="0dp" android:layout_height="match_parent" android:layout_marginBottom="0.5dp" android:layout_weight="1" android:background="@drawable/cellshape" android:gravity="left|center" android:paddingLeft="10dp" android:text="Journey Date" android:textColor="@color/textcolor" android:textSize="15dp" android:textStyle="bold" /> <Button android:id="@+id/tvJourneyDate" android:layout_width="0dp" android:layout_height="match_parent" android:layout_gravity="center" android:layout_marginBottom="0.5dp" android:layout_marginLeft="0.5dp" android:layout_weight="1" android:background="@drawable/cellshape" android:gravity="left|center|center_vertical" android:paddingLeft="10dp" android:paddingRight="10dp" android:text="2/3/2017" android:textColor="@color/vehicledetailcolor" android:textSize="15dp" /> </TableRow> </LinearLayout>对象时添加以下代码行：

UNMutableNotificationContent

您还应该在AppDelegate中添加以下方法：

content.setValue("YES", forKeyPath: "shouldAlwaysAlertWhileAppIsForeground")

Answer 2

UNUserNotificationCenter.current（）。requestAuthorization＆＃00;完成处理程序异步处理（该方法在不同的线程中处理）。这就是为什么＆＃34;如果isGrantedNotificationAccess ..＆＃34;在completionHandler完成之前读取了代码中的语句。

有一些方法可以解决这个问题。一种是使用NotificationCenter将requestAuthorization方法的结束通知给HomeViewController（参见下面的示例）。

import UserNotifications

class HomeViewController: UIViewController{

let notification = Notification.Name("requestAuthorizationComplete")

override func viewDidLoad() {
    super.viewDidLoad()

    // Register self as Observer to receive notification
    NotificationCenter.default.addObserver(self, selector: #selector(self.triggerNotification), name: notification, object: nil)

    UNUserNotificationCenter.current().requestAuthorization(
        options: [.alert,.sound,.badge],
        completionHandler: { (granted,error) in
        NotificationCenter.default.post(name: self.notification, object: nil)
    })

}

func triggerNotification(notification:NSNotification?){
 // this function will be called once requestAuthorization is complete
}

Swift - 本地通知不会被触发

2 个答案: