There are lots of tutorials online for this, you could just Google it.
Here's a tutorial: http://jamesonquave.com/blog/local-notifications-in-ios-8-with-swift-part-1/
Also here's an example of a local notification:
let notification = UILocalNotification()
notification.fireDate = date
notification.alertBody = "Alert!"
notification.alertAction = "open"
notification.hasAction = true
notification.userInfo = ["UUID": "reminderID" ]
UIApplication.sharedApplication().scheduleLocalNotification(notification)