GPS track summary view controller with event handling

TrackSummaryViewController.swift

import UIKit

class TrackSummaryViewController: UIViewController {
    let observer: TrackSummaryViewObserver
    private var trackID: Int!

    @IBOutlet private(set) var nameField: UITextField!
    @IBOutlet private(set) var dateLabel: UILabel!
    @IBOutlet private(set) var distanceLabel: UILabel!

    init(observer: TrackSummaryViewObserver) {
        self.observer = observer
        super.init(nibName: "TrackSummaryViewController", bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) is not supported")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        observer.viewShouldReloadData(self)
    }
}

extension TrackSummaryViewController: TrackSummaryView {
    func setTrackID(trackID: Int) {
        self.trackID = trackID
    }

    func setName(name: String) {
        nameField.text = name
    }

    func setDate(date: String) {
        dateLabel.text = date
    }

    func setDistance(distance: String) {
        distanceLabel.text = distance
    }
}

extension TrackSummaryViewController: UITextFieldDelegate {
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    func textFieldDidEndEditing(textField: UITextField) {
        observer.view(self, didChangeTrackName: textField.text!, forTrackWithID: trackID)
    }
}