iOS: Creating permanent speech balloons for annotations using MapBox

In the code posted, when you click on the annotation, the speech balloon pops up to say

Hello World!
Welcome to my marker

What I want to do is make it so that the speech bubble is shown immediately without having to click on the annotation. I also want the speech bubble to disappear after about an hour or so.

Also, I found this example which looks like it shows how to do another version of a popup if you find this useful, but I couldn't figure out how to create the customCalloutView.

.

If you would like to go a step further, I would like to know how to make the speech bubble appear while using the app, and have the speech bubble display some text that the user would enter in, and disappear after about an hour or so. The bubble would be able to be seen by other users even if the user logged out or closed the app.

Thank-you

import Mapbox

class ViewController: UIViewController, MGLMapViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        let mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        // Set the map’s center coordinate and zoom level.
        mapView.setCenter(CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407), zoomLevel: 12, animated: false)
        view.addSubview(mapView)

        // Set the delegate property of our map view to `self` after instantiating it.
        mapView.delegate = self

        // Declare the marker `hello` and set its coordinates, title, and subtitle.
        let hello = MGLPointAnnotation()
        hello.coordinate = CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407)
        hello.title = "Hello world!"
        hello.subtitle = "Welcome to my marker"

        // Add marker `hello` to the map.
        mapView.addAnnotation(hello)
    }

    // Use the default marker. See also: our view annotation or custom marker examples.
    func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView? {
        return nil
    }

    // Allow callout view to appear when an annotation is tapped.
    func mapView(_ mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
        return true
    }
}

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