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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
import UIKit
class TipsPageViewController: UIViewController {
enum State {
case showTips
case showEmpty(controller: UIViewController)
}
private var emptyController: UIViewController?
private var currentPageController: UIPageViewController?
private var tipManager: TipManager
private let tipTappedAction: (TipManager.Tip) -> Void
private let tapOutsideAction: () -> Void
private func createPageController() -> UIPageViewController {
let pageController = UIPageViewController(
transitionStyle: .scroll,
navigationOrientation: .horizontal,
options: nil
)
pageController.dataSource = self
pageController.delegate = self
pageController.view.backgroundColor = .clear
return pageController
}
init(
tipManager: TipManager,
tipTapped: @escaping (TipManager.Tip) -> Void,
tapOutsideAction: @escaping () -> Void) {
self.tipManager = tipManager
self.tipTappedAction = tipTapped
self.tapOutsideAction = tapOutsideAction
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .clear
}
func setupPageController(with state: State) {
currentPageController?.removeAsChild()
emptyController?.removeAsChild()
switch state {
case .showTips:
guard let initialVC = tipManager.fetchFirstTip().map({ TipViewController(tip: $0, tipTappedAction: tipTappedAction, tapOutsideAction: tapOutsideAction) }) else { return }
self.currentPageController = createPageController()
self.currentPageController.map { install($0, on: self.view) }
self.currentPageController?.setViewControllers([initialVC], direction: .forward, animated: true, completion: nil)
let pageControl = currentPageController?.view.subviews.first { $0 is UIPageControl } as? UIPageControl
pageControl?.pageIndicatorTintColor = .primaryText.withAlphaComponent(0.48)
pageControl?.currentPageIndicatorTintColor = .primaryText
case .showEmpty(let controller):
emptyController = controller
install(controller, on: self.view)
}
}
}
extension TipsPageViewController: UIPageViewControllerDataSource, UIPageViewControllerDelegate {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let tip = (viewController as! TipViewController).tip
return tipManager.getTip(before: tip).map { TipViewController(tip: $0, tipTappedAction: tipTappedAction, tapOutsideAction: tapOutsideAction) }
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let tip = (viewController as! TipViewController).tip
return tipManager.getTip(after: tip).map { TipViewController(tip: $0, tipTappedAction: tipTappedAction, tapOutsideAction: tapOutsideAction) }
}
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return self.tipManager.numberOfTips
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
}