Sync active tab and navigation stack between split view/tab bar controllers

This commit is contained in:
Shadowfacts 2020-06-29 22:21:03 -04:00
parent 78da04162f
commit 864fd77ecc
8 changed files with 347 additions and 54 deletions

View File

@ -19,6 +19,8 @@ class ExploreViewController: EnhancedTableViewController {
var resultsController: SearchResultsViewController!
var searchController: UISearchController!
var searchControllerStatusOnAppearance: Bool? = nil
init(mastodonController: MastodonController) {
self.mastodonController = mastodonController
@ -109,6 +111,18 @@ class ExploreViewController: EnhancedTableViewController {
reloadLists()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// this is a workaround for the issue that setting isActive on a search controller that is not visible
// does not cause it to automatically become active once it becomes visible
// see FB7814561
if let active = searchControllerStatusOnAppearance {
searchController.isActive = active
searchControllerStatusOnAppearance = nil
}
}
func reloadLists() {
let request = Client.getLists()
mastodonController.run(request) { (response) in

View File

@ -18,12 +18,45 @@ protocol MainSidebarViewControllerDelegate: class {
@available(iOS 14.0, *)
class MainSidebarViewController: UIViewController {
weak var mastodonController: MastodonController!
private weak var mastodonController: MastodonController!
weak var sidebarDelegate: MainSidebarViewControllerDelegate?
var collectionView: UICollectionView!
var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
private var collectionView: UICollectionView!
private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
var allItems: [Item] {
[
.tab(.timelines),
.tab(.notifications),
.tab(.myProfile),
] + exploreTabItems
}
var exploreTabItems: [Item] {
var items: [Item] = [.search, .bookmarks]
let snapshot = dataSource.snapshot()
for case let .list(list) in snapshot.itemIdentifiers(inSection: .lists) {
items.append(.list(list))
}
for case let .savedHashtag(hashtag) in snapshot.itemIdentifiers(inSection: .savedHashtags) {
items.append(.savedHashtag(hashtag))
}
for case let .savedInstance(instance) in snapshot.itemIdentifiers(inSection: .savedInstances) {
items.append(.savedInstance(instance))
}
return items
}
private(set) var previouslySelectedItem: Item?
var selectedItem: Item? {
guard let indexPath = collectionView.indexPathsForSelectedItems?.first else {
return nil
}
return dataSource.itemIdentifier(for: indexPath)
}
private(set) var itemLastSelectedTimestamps = [Item: Date]()
init(mastodonController: MastodonController) {
self.mastodonController = mastodonController
@ -53,15 +86,16 @@ class MainSidebarViewController: UIViewController {
applyInitialSnapshot()
select(.tab(.timelines), animated: false)
select(item: .tab(.timelines), animated: false)
NotificationCenter.default.addObserver(self, selector: #selector(reloadSavedHashtags), name: .savedHashtagsChanged, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(reloadSavedInstances), name: .savedInstancesChanged, object: nil)
}
func select(_ item: Item, animated: Bool) {
func select(item: Item, animated: Bool) {
guard let indexPath = dataSource.indexPath(for: item) else { return }
collectionView.selectItem(at: indexPath, animated: animated, scrollPosition: .top)
itemLastSelectedTimestamps[item] = Date()
}
private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
@ -301,32 +335,35 @@ fileprivate extension MainTabBarViewController.Tab {
@available(iOS 14.0, *)
extension MainSidebarViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
guard let item = dataSource.itemIdentifier(for: indexPath) else {
return false
}
switch item {
case .tab(.compose):
sidebarDelegate?.sidebarRequestPresentCompose(self)
return false
case .addList:
showAddList()
return false
case .addSavedHashtag:
showAddSavedHashtag()
return false
case .addSavedInstance:
showAddSavedInstance()
return false
default:
return true
}
previouslySelectedItem = selectedItem
return true
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
guard let item = dataSource.itemIdentifier(for: indexPath) else {
collectionView.deselectItem(at: indexPath, animated: true)
return
}
sidebarDelegate?.sidebar(self, didSelectItem: item)
itemLastSelectedTimestamps[item] = Date()
if [MainSidebarViewController.Item.tab(.compose), .addList, .addSavedHashtag, .addSavedInstance].contains(item) {
if let previous = previouslySelectedItem, let indexPath = dataSource.indexPath(for: previous) {
collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .centeredVertically)
}
switch item {
case .tab(.compose):
sidebarDelegate?.sidebarRequestPresentCompose(self)
case .addList:
showAddList()
case .addSavedHashtag:
showAddSavedHashtag()
case .addSavedInstance:
showAddSavedInstance()
default:
fatalError("unreachable")
}
} else {
sidebarDelegate?.sidebar(self, didSelectItem: item)
}
}
}

View File

@ -15,7 +15,10 @@ class MainSplitViewController: UISplitViewController {
private var sidebar: MainSidebarViewController!
private var detailViewControllers: [MainSidebarViewController.Item: UIViewController] = [:]
// Keep track of navigation stacks per-item so that we can only ever use a single navigation controller
private var navigationStacks: [MainSidebarViewController.Item: [UIViewController]] = [:]
private var tabBarViewController: MainTabBarViewController!
init(mastodonController: MastodonController) {
self.mastodonController = mastodonController
@ -34,36 +37,234 @@ class MainSplitViewController: UISplitViewController {
preferredSplitBehavior = .tile
presentsWithGesture = false
showsSecondaryOnlyButton = false
delegate = self
sidebar = MainSidebarViewController(mastodonController: mastodonController)
sidebar.sidebarDelegate = self
setViewController(sidebar, for: .primary)
setViewController(EnhancedNavigationViewController(), for: .secondary)
select(item: .tab(.timelines))
setViewController(MainTabBarViewController(mastodonController: mastodonController), for: .compact)
tabBarViewController = MainTabBarViewController(mastodonController: mastodonController)
setViewController(tabBarViewController, for: .compact)
}
func select(item: MainSidebarViewController.Item) {
let itemController = getOrCreateDetailViewController(item: item)
setViewController(itemController, for: .secondary)
let nav = viewController(for: .secondary) as! UINavigationController
nav.viewControllers = getOrCreateNavigationStack(item: item)
}
func getOrCreateDetailViewController(item: MainSidebarViewController.Item) -> UIViewController? {
if let existing = detailViewControllers[item] {
func getOrCreateNavigationStack(item: MainSidebarViewController.Item) -> [UIViewController] {
if let existing = navigationStacks[item], existing.count > 0 {
return existing
} else {
guard let new = item.createRootViewController(mastodonController) else { return nil }
let nav = EnhancedNavigationViewController(rootViewController: new)
// Prevents the navigation bar from going transparent when switching sidebar sections.
nav.navigationBar.scrollEdgeAppearance = nav.navigationBar.standardAppearance
detailViewControllers[item] = nav
return nav
let new = [item.createRootViewController(mastodonController)!]
navigationStacks[item] = new
return new
}
}
}
@available(iOS 14.0, *)
extension MainSplitViewController: UISplitViewControllerDelegate {
/// Transfer the navigation stack for a sidebar item to a destination navgiation controller.
/// - Parameter dropFirst: Remove the first view controller from the item's navigation stack before transferring.
/// - Parameter append: Append the item's navigation stack to the destination nav controller's instead of replacing it.
private func transferNavigationStack(from item: MainSidebarViewController.Item, to destination: UINavigationController, dropFirst: Bool = false, append: Bool = false) {
var itemNavStack: [UIViewController]
if item == sidebar.selectedItem {
let detailNav = viewController(for: .secondary) as! UINavigationController
itemNavStack = detailNav.viewControllers
} else {
itemNavStack = navigationStacks[item] ?? []
navigationStacks.removeValue(forKey: item)
}
if itemNavStack.isEmpty {
itemNavStack = [item.createRootViewController(mastodonController)!]
}
if dropFirst {
itemNavStack.remove(at: 0)
}
if append {
destination.viewControllers += itemNavStack
} else {
destination.viewControllers = itemNavStack
}
}
func splitViewControllerDidCollapse(_ svc: UISplitViewController) {
// Transfer the nav stacks for all the sidebar items that map 1 <-> 1 with tabs
for tab in [MainTabBarViewController.Tab.timelines, .notifications, .myProfile] {
let tabNav = tabBarViewController.viewController(for: tab) as! UINavigationController
transferNavigationStack(from: .tab(tab), to: tabNav)
}
// Since several sidebar items map to the single Explore tab, we only transfer the
// navigation stack of the most-recently used one.
let mostRecentExploreItem: (MainSidebarViewController.Item, Date)? =
sidebar.exploreTabItems.compactMap {
if let timestamp = sidebar.itemLastSelectedTimestamps[$0] {
return ($0, timestamp)
} else {
return nil
}
}.min {
$0.1 > $1.1
}
if let mostRecentExploreItem = mostRecentExploreItem?.0,
mostRecentExploreItem != .search {
let exploreNav = tabBarViewController.viewController(for: .explore) as! UINavigationController
// Pop back to root, so we're appending to the Explore VC instead of some other VC
exploreNav.popToRootViewController(animated: false)
// Append so we don't replace the Explore VC
transferNavigationStack(from: mostRecentExploreItem, to: exploreNav, append: true)
}
// Switch the tab bar to focus the same item as the sidebar has selected
switch sidebar.selectedItem! {
case let .tab(tab):
// sidebar items that map 1 <-> 1 can be transferred directly
tabBarViewController.select(tab: tab)
case .search:
// Search sidebar item maps to the Explore tab with the search controller/results visible
// The nav stack can't be copied directly, since the split VC uses a different SearchViewController
// so that explore items aren't shown multiple times.
let exploreNav = tabBarViewController.viewController(for: .explore) as! UINavigationController
let explore: ExploreViewController
if let existing = exploreNav.viewControllers.first as? ExploreViewController {
explore = existing
exploreNav.popToRootViewController(animated: false)
} else {
// If the Explore tab hasn't been loaded before, it's root view controller won't be loaded yet, so create and add it manually.
explore = ExploreViewController(mastodonController: mastodonController)
exploreNav.viewControllers = [explore]
}
// Make sure viewDidLoad is called so that the searchController/resultsController have been initialized
explore.loadViewIfNeeded()
let nav = viewController(for: .secondary) as! UINavigationController
let search = nav.viewControllers.first as! SearchViewController
// Copy the search query from the search VC to the Explore VC's search controller.
let query = search.searchController.searchBar.text ?? ""
explore.searchController.searchBar.text = query
// Instruct the explore controller to show its search controller immediately upon its first appearance.
// explore.searchController.isActive can't be set directly, see FB7814561
explore.searchControllerStatusOnAppearance = !query.isEmpty
// Copy the results from the search VC's results controller to avoid the delay introduced by an extra network request
explore.resultsController.loadResults(from: search.resultsController)
// Transfer the navigation stack, dropping the search VC, to keep anything the user has opened
transferNavigationStack(from: .search, to: exploreNav, dropFirst: true, append: true)
tabBarViewController.select(tab: .explore)
case .bookmarks, .list(_), .savedHashtag(_), .savedInstance(_):
tabBarViewController.select(tab: .explore)
// Make sure the Explore VC doesn't show it's search bar when it appears, in case the user was previously
// in compact mode and performing a search.
let exploreNav = tabBarViewController.viewController(for: .explore) as! UINavigationController
let explore = exploreNav.viewControllers.first as! ExploreViewController
explore.searchControllerStatusOnAppearance = false
case .listsHeader, .addList, .savedHashtagsHeader, .addSavedHashtag, .savedInstancesHeader, .addSavedInstance:
// These items are not selectable in the sidebar collection view, so this code is unreachable.
fatalError("unreachable")
}
}
/// Transfer a navigation stack from a navigation controller belonging to the tab bar VC to a sidebar item.
/// - Parameter skipFirst:The number of view controllers that should be skipped from the source navigation controller.
/// - Parameter prepend: An optional view controller to prepend to the beginning of the navigation stack being moved.
private func transferNavigationStack(from navController: UINavigationController, to item: MainSidebarViewController.Item, skipFirst: Int = 0, prepend: UIViewController? = nil) {
let viewControllersToMove = navController.viewControllers.dropFirst(skipFirst)
navController.viewControllers.removeLast(navController.viewControllers.count - skipFirst)
if let prepend = prepend {
navigationStacks[item] = [prepend] + viewControllersToMove
} else {
navigationStacks[item] = Array(viewControllersToMove)
}
}
func splitViewControllerDidExpand(_ svc: UISplitViewController) {
// For each sidebar item, transfer the existing navigation stasck from the tab bar controller to ourself.
var exploreItem: MainSidebarViewController.Item?
for tab in MainTabBarViewController.Tab.allCases {
guard let tabNavController = tabBarViewController.viewController(for: tab) as? UINavigationController else { continue }
let tabNavigationStack = tabNavController.viewControllers
switch tab {
case .timelines, .notifications, .myProfile:
// Items that map 1 <-> 1 to tabs can be transferred directly.
let item = MainSidebarViewController.Item.tab(tab)
transferNavigationStack(from: tabNavController, to: item)
case .explore:
// The Explore tab is more complicated since it encapsulates a bunch of screens which have top-level sidebar items.
var toPrepend: UIViewController? = nil
// If the tab navigation stack has only one item or the search controller is active, it corresponds to the Search item
// For other items, the 2nd VC in the nav stack determines which sidebar item they map to.
// Search screen has special considerations, all others can be transferred directly.
if tabNavigationStack.count == 1 || ((tabNavigationStack.first as? ExploreViewController)?.searchController.isActive ?? false) {
exploreItem = .search
let searchVC = SearchViewController(mastodonController: mastodonController)
searchVC.loadViewIfNeeded()
let explore = tabNavigationStack.first as! ExploreViewController
if let exploreSearchControler = explore.searchController,
let query = exploreSearchControler.searchBar.text {
// Transfer query to search VC
searchVC.searchController.searchBar.text = query
// If there is a query, make the search VC activate itself upon appearing
searchVC.searchControllerStatusOnAppearance = !query.isEmpty
// Transfer the results from the explore VC, to avoid an extra network request
searchVC.resultsController.loadResults(from: explore.resultsController)
}
// Insert the new search VC at the beginning of the new search nav stack
toPrepend = searchVC
} else if tabNavigationStack[1] is BookmarksTableViewController {
exploreItem = .bookmarks
} else if let listVC = tabNavigationStack[1] as? ListTimelineViewController {
exploreItem = .list(listVC.list)
} else if let hashtagVC = tabNavigationStack[1] as? HashtagTimelineViewController {
exploreItem = .savedHashtag(hashtagVC.hashtag)
} else if let instanceVC = tabNavigationStack[1] as? InstanceTimelineViewController {
exploreItem = .savedInstance(instanceVC.instanceURL)
}
transferNavigationStack(from: tabNavController, to: exploreItem!, skipFirst: 1, prepend: toPrepend)
case .compose:
// The compose tab can't be activated, this is unreachable.
fatalError("unreachable")
}
}
// Transfer the selected tab from the tab bar VC to the sidebar
switch tabBarViewController.selectedTab {
case .timelines, .notifications, .myProfile:
// These tabs map 1 <-> 1 with sidebar items
let item = MainSidebarViewController.Item.tab(tabBarViewController.selectedTab)
sidebar.select(item: item, animated: false)
select(item: item)
case .explore:
// If the explore tab is active, the sidebar item is determined above when transferring the explore VC's nav stack
sidebar.select(item: exploreItem!, animated: false)
select(item: exploreItem!)
default:
return
}
}
}
@available(iOS 14.0, *)
extension MainSplitViewController: MainSidebarViewControllerDelegate {
func sidebarRequestPresentCompose(_ sidebarViewController: MainSidebarViewController) {
@ -71,6 +272,10 @@ extension MainSplitViewController: MainSidebarViewControllerDelegate {
}
func sidebar(_ sidebarViewController: MainSidebarViewController, didSelectItem item: MainSidebarViewController.Item) {
let nav = viewController(for: .secondary) as! UINavigationController
if let previous = sidebar.previouslySelectedItem {
navigationStacks[previous] = nav.viewControllers
}
select(item: item)
}
}

View File

@ -13,6 +13,10 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
weak var mastodonController: MastodonController!
private var composePlaceholder: UIViewController!
var selectedTab: Tab {
return Tab(rawValue: selectedIndex)!
}
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
if UIDevice.current.userInterfaceIdiom == .phone {
@ -65,6 +69,14 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
}
return true
}
func setViewController(_ viewController: UIViewController, forTab tab: Tab) {
viewControllers![tab.rawValue] = viewController
}
func viewController(for tab: Tab) -> UIViewController {
return viewControllers![tab.rawValue]
}
}
extension MainTabBarViewController {
@ -91,8 +103,6 @@ extension MainTabBarViewController {
}
}
func getTabController(tab: Tab) -> UIViewController? {
if tab == .compose {
return nil

View File

@ -17,7 +17,6 @@ class MyProfileTableViewController: ProfileTableViewController {
title = "My Profile"
tabBarItem.image = UIImage(systemName: "person.fill")
mastodonController.getOwnAccount { (account) in
self.accountID = account.id
@ -41,14 +40,6 @@ class MyProfileTableViewController: ProfileTableViewController {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
@objc func preferencesPressed() {
present(PreferencesNavigationController(mastodonController: mastodonController), animated: true)
}

View File

@ -31,10 +31,6 @@ class ProfileTableViewController: EnhancedTableViewController {
self.accountID = accountID
super.init(style: .plain)
self.refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: #selector(refreshStatuses(_:)), for: .valueChanged)
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: #selector(composePressed(_:)))
}
required init?(coder aDecoder: NSCoder) {
@ -51,6 +47,10 @@ class ProfileTableViewController: EnhancedTableViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: #selector(refreshStatuses(_:)), for: .valueChanged)
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: #selector(composePressed(_:)))
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 140

View File

@ -109,6 +109,15 @@ class SearchResultsViewController: EnhancedTableViewController {
return super.targetViewController(forAction: action, sender: sender)
}
func loadResults(from source: SearchResultsViewController) {
currentQuery = source.currentQuery
if let sourceDataSource = source.dataSource {
dataSource.apply(sourceDataSource.snapshot())
}
// todo: check if the search needs to be performed before searching
// performSearch(query: currentQuery)
}
func performSearch(query: String?) {
guard let query = query, !query.isEmpty else {
self.dataSource.apply(NSDiffableDataSourceSnapshot<Section, Item>())
@ -212,6 +221,20 @@ extension SearchResultsViewController {
case account(String)
case hashtag(Hashtag)
case status(String, StatusState)
func hash(into hasher: inout Hasher) {
switch self {
case let .account(id):
hasher.combine("account")
hasher.combine(id)
case let .hashtag(hashtag):
hasher.combine("hashtag")
hasher.combine(hashtag.url)
case let .status(id, _):
hasher.combine("status")
hasher.combine(id)
}
}
}
class DataSource: UITableViewDiffableDataSource<Section, Item> {

View File

@ -15,6 +15,8 @@ class SearchViewController: UIViewController {
var resultsController: SearchResultsViewController!
var searchController: UISearchController!
var searchControllerStatusOnAppearance: Bool? = nil
init(mastodonController: MastodonController) {
self.mastodonController = mastodonController
@ -42,5 +44,16 @@ class SearchViewController: UIViewController {
navigationItem.hidesSearchBarWhenScrolling = false
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// this is a workaround for the issue that setting isActive on a search controller that is not visible
// does not cause it to automatically become active once it becomes visible
// see FB7814561
if let active = searchControllerStatusOnAppearance {
searchController.isActive = active
searchControllerStatusOnAppearance = nil
}
}
}