Keep UNNotificationContent some seconds

问题:

I'm doing an app in Swift 3 for iOS 10. I have done an UNNotificationContent to simulate a call in my app but it disappears approximately five seconds after being launched. I need to keep it more seconds, while the "calling" is in process. I want to keep the local notification until I call the removeAllPendingNotificationRequests method. Can I do it?

This is my code now:

let content = UNMutableNotificationContent()
content.body = "\(userName) is calling..."
content.sound = UNNotificationSound(named: "sound_call.wav")
content.badge = 1

let request = UNNotificationRequest(identifier: "notification", content: content, trigger: nil)
UNUserNotificationCenter.current().add(request)

Thanks!

回答1:

There's no way to control how long the notification stays on the screen. That's controlled by the system.