ios - 我怎样才能让 UNNotificationRequest 立即弹出？

Question

我正在使用 UNNotificationRequest，我希望在单击按钮时立即弹出通知。但在这种情况下，它会在我退出应用程序时出现。 这是我的代码

@IBAction func shortNotifBtn(_ sender: Any) {
    let center = UNUserNotificationCenter.current()
    let content = UNMutableNotificationContent()
    content.title = "Late wake up call"
    content.body = "The early bird catches the worm, but the second mouse gets the cheese."
    content.categoryIdentifier = "alarm"
    content.userInfo = ["customData": "fizzbuzz"]
    content.sound = UNNotificationSound.default()
    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
    let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
    center.add(request)
}

Answer 1

当问题是关于更现代的 UNNotificationRequest 时，Max 的回答是针对已弃用的 UILocalNotification。

正确答案是传递 nil。根据documentation for UNNotificationRequest's requestWithIdentifier:content:trigger:

trigger

The condition that causes the notification to be delivered. Specify nil to deliver the notification right away.

所以在你的代码中:

let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)