获得更多详细信息后，我想我知道为什么您仍然看不到正在发送的通知。我正在另一个答案中让它不要太长，但我会保留我之前的答案以供参考。
也许您正在等待应用程序在前台的通知？我将参考文档的另一部分：
调度和处理本地通知
在关于当您的应用程序处于前台时处理通知的部分：
如果在您的应用处于前台时收到通知，您可以将该通知静音或告诉系统继续显示通知界面。系统默认将前台应用程序的通知静音，将通知数据直接发送到您的应用程序...
因此，如果是这种情况，您必须为UNUserNotificationCenter.
我建议您这样做，在 AppDelegate 上分配委托，UNUserNotificationCenter因为文档说必须在应用程序完成启动之前完成：
// AppDelegate.swift
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
UNUserNotificationCenter.current().delegate = self
return true
}
// Rest of your code on AppDelegate...
}
extension AppDelegate: UNUserNotificationCenterDelegate {
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
// Here we actually handle the notification
print("Notification received with identifier \(notification.request.identifier)")
// So we call the completionHandler telling that the notification should display a banner and play the notification sound - this will happen while the app is in foreground
completionHandler([.banner, .sound])
}
}
在您处理通知授权和请求注册的视图控制器上，您可以这样做：
class NotificationsViewController: UIViewController {
static let notificationAuthorizedNotification = NSNotification.Name(rawValue: "NotificationAuthorizedNotification")
let randVerseCenter = UNUserNotificationCenter.current()
override func viewDidLoad() {
super.viewDidLoad()
// We call this method when we know that the user granted permission, so we know we can then make notification requests
NotificationCenter.default.addObserver(self, selector: #selector(handleNotificationAuthorization), name: NotificationsViewController.notificationAuthorizedNotification, object: nil)
randVerseCenter.getNotificationSettings { [weak self] settings in
// We check current settings and asks for permission if not granted before
if settings.authorizationStatus == .notDetermined {
// Step 1 - Ask the use for permission to notify
self?.randVerseCenter.requestAuthorization(options: [.alert, .sound]){ (granted, error) in
if granted {
NotificationCenter.default.post(name: NotificationsViewController.notificationAuthorizedNotification, object: nil)
print("Yay - request authorisation worked!")
} else {
print ("D'oH - request Authorisation did not work!")
}
}
}
}
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
// We stop listening to those notifications here
NotificationCenter.default.removeObserver(self)
}
@objc
func handleNotificationAuthorization() {
// Step 2 - Create the Notification Content
let randVerseContent = UNMutableNotificationContent()
randVerseContent.title = "Random Reference"
randVerseContent.body = "Random Verse"
randVerseContent.sound = UNNotificationSound.default
// Step 3 - Create the trigger for the notification by delay
let randVerseDate = Date().addingTimeInterval(30)
let randVerseDateComponents = Calendar.current.dateComponents([.second], from: randVerseDate)
let randVerseTrigger = UNCalendarNotificationTrigger(dateMatching: randVerseDateComponents, repeats: true)
// Step 4 - Creating the request
let randVerseUUIDString = UUID().uuidString
let randVerseRequest = UNNotificationRequest(identifier: randVerseUUIDString, content: randVerseContent, trigger: randVerseTrigger)
// Step 5 - Register the request
randVerseCenter.add(randVerseRequest) { (error) in
if let error = error{
print (error.localizedDescription)
} else {
print("Successfully registered notification with id \(randVerseUUIDString) at every second \(randVerseDateComponents.second!) of a minute")
}
}
}
}
您可能仍然安排了较旧的通知，因为您的代码正在请求它们，viewDidLoad并且您可能没有删除它们或删除应用程序。您可以在您的示例
上使用它来检查待处理的通知：viewDidLoad
randVerseCenter.getPendingNotificationRequests() { requests in
for request in requests {
guard let trigger = request.trigger as? UNCalendarNotificationTrigger else { return }
print("Notification registered with id \(request.identifier) is schedulled for \(trigger.nextTriggerDate()?.description ?? "(not schedulled)")")
}
}
并使用randVerseCenter它们的标识符删除它们或删除所有它们。