forked from shadowfacts/Tusker
Don't use UIPageViewController for SegmentedPageViewController
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@ -12,7 +12,7 @@ protocol SegmentedPageViewControllerPage: Hashable {
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var segmentedControlTitle: String { get }
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}
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class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPageViewController, UIPageViewControllerDelegate, TabbedPageViewController {
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class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIViewController, UIPageViewControllerDelegate, TabbedPageViewController {
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private(set) var pages: [Page]!
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private let pageProvider: (Page) -> UIViewController
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@ -23,9 +23,7 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPage
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var currentIndex: Int! {
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pages.firstIndex(of: currentPage)
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}
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var currentViewController: UIViewController! {
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viewControllers?.first
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}
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var currentViewController: UIViewController!
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let segmentedControl = ScrollingSegmentedControl<Page>()
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@ -37,7 +35,7 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPage
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initialPage = pages.first!
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currentPage = pages.first!
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super.init(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
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super.init(nibName: nil, bundle: nil)
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setPages(pages, animated: false)
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@ -104,12 +102,12 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPage
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initialPage = page
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return
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}
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let direction: UIPageViewController.NavigationDirection
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let direction: AnimationMode
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if let prevIndex = currentIndex {
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let index = pages.firstIndex(of: page)!
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direction = index - prevIndex > 0 ? .forward : .reverse
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} else {
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direction = .forward
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direction = .none
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}
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currentPage = page
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@ -121,12 +119,40 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPage
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pageControllers[page] = newController
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}
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setViewControllers([newController], direction: direction, animated: animated)
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setViewController(newController, animated: animated ? direction : .none)
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navigationItem.title = newController.title
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segmentedControl.setSelectedOption(page, animated: animated)
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}
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private func setViewController(_ newViewController: UIViewController, animated: AnimationMode) {
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guard let currentViewController,
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animated != .none else {
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currentViewController?.removeViewAndController()
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newViewController.view.translatesAutoresizingMaskIntoConstraints = false
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embedChild(newViewController)
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self.currentViewController = newViewController
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return
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}
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guard currentViewController !== newViewController else {
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return
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}
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self.currentViewController = newViewController
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newViewController.view.translatesAutoresizingMaskIntoConstraints = false
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embedChild(newViewController)
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let direction: CGFloat = animated == .forward ? 1 : -1
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newViewController.view.transform = CGAffineTransform(translationX: direction * view.bounds.width, y: 0)
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let animator = UIViewPropertyAnimator(duration: 0.5, timingParameters: UISpringTimingParameters(dampingRatio: 1, initialVelocity: .zero))
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animator.addAnimations {
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newViewController.view.transform = .identity
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currentViewController.view.transform = CGAffineTransform(translationX: -1 * direction * self.view.bounds.width, y: 0)
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}
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animator.addCompletion { _ in
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currentViewController.removeViewAndController()
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}
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animator.startAnimation()
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}
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// MARK: TabbedPageViewController
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func selectNextPage() {
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@ -138,7 +164,14 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIPage
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guard currentIndex > 0 else { return }
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selectPage(pages[currentIndex - 1], animated: true)
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}
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}
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extension SegmentedPageViewController {
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enum AnimationMode: Equatable {
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case none
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case forward
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case reverse
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}
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}
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extension SegmentedPageViewController: TabBarScrollableViewController {
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