import UIKit

import Parchment

class ViewController: UIViewController {

extension ViewController: PagingViewControllerDataSource {

func pagingViewController(_: PagingViewController, pagingItemAt index: Int) -> PagingItem {

return PagingIndexItem(index: index, title: cities[index])

}

func pagingViewController(_: PagingViewController, viewControllerAt index: Int) -> UIViewController {

return CityViewController(title: cities[index])

}

func numberOfViewControllers(in pagingViewController: PagingViewController) -> Int {

return cities.count

}

extension ViewController: PagingViewControllerSizeDelegate {

// We want the size of our paging items to equal the width of the

// city title. Parchment does not support self-sizing cells at

// the moment, so we have to handle the calculation ourself. We

// can access the title string by casting the paging item to a

// PagingTitleItem, which is the PagingItem type used by

// FixedPagingViewController.

func pagingViewController(_ pagingViewController: PagingViewController, widthForPagingItem pagingItem: PagingItem, isSelected: Bool) -> CGFloat {

}