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RootTabBarViewController.swift
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RootTabBarViewController.swift
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import AlamofireImage
import KsApi
import Library
import Prelude
import UIKit
internal protocol TabBarControllerScrollable {
func scrollToTop()
}
extension TabBarControllerScrollable where Self: UIViewController {
func scrollToTop() {
if let scrollView = self.view as? UIScrollView {
scrollView.scrollToTop()
}
}
}
public final class RootTabBarViewController: UITabBarController, MessageBannerViewControllerPresenting {
private var applicationWillEnterForegroundObserver: Any?
public var messageBannerViewController: MessageBannerViewController?
private var sessionEndedObserver: Any?
private var sessionStartedObserver: Any?
private var userUpdatedObserver: Any?
private var userLocalePreferencesChangedObserver: Any?
private var voiceOverStatusDidChangeObserver: Any?
fileprivate let viewModel: RootViewModelType = RootViewModel()
public override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
self.applicationWillEnterForegroundObserver = NotificationCenter
.default
.addObserver(
forName: UIApplication.willEnterForegroundNotification,
object: nil, queue: nil
) { [weak self] _ in
self?.viewModel.inputs.applicationWillEnterForeground()
}
self.sessionStartedObserver = NotificationCenter
.default
.addObserver(forName: Notification.Name.ksr_sessionStarted, object: nil, queue: nil) { [weak self] _ in
self?.viewModel.inputs.userSessionStarted()
}
self.sessionEndedObserver = NotificationCenter
.default
.addObserver(forName: Notification.Name.ksr_sessionEnded, object: nil, queue: nil) { [weak self] _ in
self?.viewModel.inputs.userSessionEnded()
}
self.userUpdatedObserver = NotificationCenter
.default
.addObserver(forName: Notification.Name.ksr_userUpdated, object: nil, queue: nil) { [weak self] _ in
self?.viewModel.inputs.currentUserUpdated()
}
self.voiceOverStatusDidChangeObserver = NotificationCenter
.default
.addObserver(
forName: UIAccessibility.voiceOverStatusDidChangeNotification, object: nil, queue: nil
) { [weak self] _ in
self?.viewModel.inputs.voiceOverStatusDidChange()
}
self.viewModel.outputs.updateUserInEnvironment
.observeValues { user in
AppEnvironment.updateCurrentUser(user)
NotificationCenter.default.post(.init(name: .ksr_userUpdated))
}
self.userLocalePreferencesChangedObserver = NotificationCenter
.default
.addObserver(
forName: Notification.Name.ksr_userLocalePreferencesChanged,
object: nil,
queue: nil,
using: { [weak self] _ in
self?.viewModel.inputs.userLocalePreferencesChanged()
}
)
self.messageBannerViewController = self.configureMessageBannerViewController(on: self)
self.viewModel.inputs.viewDidLoad()
}
deinit {
[
self.applicationWillEnterForegroundObserver,
self.sessionStartedObserver,
self.sessionEndedObserver,
self.userUpdatedObserver,
self.userLocalePreferencesChangedObserver,
self.voiceOverStatusDidChangeObserver
]
.compact()
.forEach(NotificationCenter.default.removeObserver)
}
public override func bindStyles() {
super.bindStyles()
_ = self.tabBar
|> UITabBar.lens.tintColor .~ tabBarSelectedColor
|> UITabBar.lens.barTintColor .~ tabBarTintColor
}
public override func bindViewModel() {
super.bindViewModel()
self.viewModel.outputs.setViewControllers
.observeForUI()
.map { $0.map { RootTabBarViewController.viewController(from: $0) }.compact() }
.map { $0.map(UINavigationController.init(rootViewController:)) }
.observeValues { [weak self] in
self?.setViewControllers($0, animated: false)
}
self.viewModel.outputs.selectedIndex
.observeForUI()
.observeValues { [weak self] in self?.selectedIndex = $0 }
self.viewModel.outputs.scrollToTop
.observeForControllerAction()
.map { [weak self] index -> UIViewController? in
guard let vcs = self?.viewControllers else { return nil }
return vcs[clamp(0, vcs.count - 1)(index)]
}
.skipNil()
.map(extractViewController)
.observeValues(scrollToTop)
self.viewModel.outputs.tabBarItemsData
.observeForUI()
.observeValues { [weak self] in self?.setTabBarItemStyles(withData: $0) }
self.viewModel.outputs.filterDiscovery
.observeForControllerAction()
.map { [weak self] index, param -> (DiscoveryViewController, DiscoveryParams)? in
self?.viewControllerAndParam(with: index, param: param)
}
.skipNil()
.observeValues { $0.filter(with: $1) }
self.viewModel.outputs.switchDashboardProject
.observeForControllerAction()
.map { [weak self] index, param -> (DashboardViewController, Param)? in
self?.viewControllerAndParam(with: index, param: param)
}
.skipNil()
.observeValues { $0.switch(toProject: $1) }
self.viewModel.outputs.setBadgeValueAtIndex
.observeForUI()
.observeValues { [weak self] value, index in
self?.tabBarItem(atIndex: index)?.badgeValue = value
}
}
public func switchToActivities() {
self.viewModel.inputs.switchToActivities()
}
public func switchToDashboard(project param: Param?) {
guard featureCreatorDashboardEnabled() else {
return
}
self.viewModel.inputs.switchToDashboard(project: param)
}
public func switchToDiscovery(params: DiscoveryParams?) {
self.viewModel.inputs.switchToDiscovery(params: params)
}
public func switchToLogin() {
self.viewModel.inputs.switchToLogin()
}
public func switchToProfile() {
self.viewModel.inputs.switchToProfile()
}
public func switchToSearch() {
self.viewModel.inputs.switchToSearch()
}
private func viewControllerAndParam<T, P>(with index: RootViewControllerIndex, param: P) -> (T, P)? {
guard
let vcs = self.viewControllers,
let nav = vcs[clamp(0, vcs.count - 1)(index)] as? UINavigationController,
let vc = nav.children.first as? T
else { return nil }
return (vc, param)
}
public func switchToMessageThread(_ messageThread: MessageThread) {
self.switchToProfile()
guard
let profileNav = self.selectedViewController as? UINavigationController,
let profileVC = profileNav.viewControllers.first
else { return }
let threadsVC = MessageThreadsViewController.configuredWith(project: nil, refTag: nil)
let messageThreadVC = MessagesViewController.configuredWith(messageThread: messageThread)
self.presentedViewController?.dismiss(animated: false, completion: nil)
profileNav.setViewControllers([profileVC, threadsVC, messageThreadVC], animated: true)
}
public func switchToCreatorMessageThread(projectId: Param, messageThread: MessageThread) {
guard featureCreatorDashboardEnabled() else {
return
}
self.switchToDashboard(project: nil)
guard
let dashboardNav = self.selectedViewController as? UINavigationController,
let dashboardVC = dashboardNav.viewControllers.first as? DashboardViewController
else { return }
self.presentedViewController?.dismiss(animated: false, completion: nil)
dashboardVC.navigateToProjectMessageThread(projectId: projectId, messageThread: messageThread)
}
public func switchToProjectActivities(projectId: Param) {
guard featureCreatorDashboardEnabled() else {
return
}
self.switchToDashboard(project: nil)
guard
let dashboardNav = self.selectedViewController as? UINavigationController,
let dashboardVC = dashboardNav.viewControllers.first as? DashboardViewController
else { return }
self.presentedViewController?.dismiss(animated: false, completion: nil)
dashboardVC.navigateToProjectActivities(projectId: projectId)
}
fileprivate func setTabBarItemStyles(withData data: TabBarItemsData) {
data.items.forEach { item in
switch item {
case let .home(index):
_ = tabBarItem(atIndex: index) ?|> homeTabBarItemStyle(isMember: data.isMember)
case let .activity(index):
_ = tabBarItem(atIndex: index) ?|> activityTabBarItemStyle(isMember: data.isMember)
case let .search(index):
_ = tabBarItem(atIndex: index) ?|> searchTabBarItemStyle
case let .dashboard(index):
let featureFlaggedTabBarItemStyle = self
.isDashboardViewControllerDisplayable() ? dashboardTabBarItemStyle :
profileTabBarItemStyle(isLoggedIn: data.isLoggedIn, isMember: data.isMember)
_ = tabBarItem(atIndex: index) ?|> featureFlaggedTabBarItemStyle
case let .profile(avatarUrl, index):
_ = tabBarItem(atIndex: index)
?|> profileTabBarItemStyle(isLoggedIn: data.isLoggedIn, isMember: data.isMember)
setProfileImage(with: data, avatarUrl: avatarUrl, index: index)
}
}
}
fileprivate func setProfileImage(with data: TabBarItemsData, avatarUrl: URL?, index: Int) {
guard
data.isLoggedIn == true,
let avatarUrl = avatarUrl,
let dir = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first
else { return }
let hash = avatarUrl.absoluteString.hashValue
let imagePath = "\(dir)/tabbar-avatar-image-\(hash).dat"
let imageUrl = URL(fileURLWithPath: imagePath)
if let imageData = try? Data(contentsOf: imageUrl) {
let (defaultImage, selectedImage) = tabbarAvatarImageFromData(imageData)
_ = self.tabBarItem(atIndex: index)
?|> profileTabBarItemStyle(isLoggedIn: true, isMember: data.isMember)
?|> UITabBarItem.lens.image .~ defaultImage
?|> UITabBarItem.lens.selectedImage .~ selectedImage
} else {
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig, delegate: nil, delegateQueue: .main)
let dataTask = session.dataTask(with: avatarUrl) { [weak self] avatarData, _, _ in
guard let avatarData = avatarData else { return }
try? avatarData.write(to: imageUrl, options: [.atomic])
let (defaultImage, selectedImage) = tabbarAvatarImageFromData(avatarData)
_ = self?.tabBarItem(atIndex: index)
?|> profileTabBarItemStyle(isLoggedIn: true, isMember: data.isMember)
?|> UITabBarItem.lens.image .~ defaultImage
?|> UITabBarItem.lens.selectedImage .~ selectedImage
}
dataTask.resume()
}
}
fileprivate func isDashboardViewControllerDisplayable() -> Bool {
guard let navigationControllers = self.viewControllers as? [UINavigationController] else {
return false
}
var foundDashboardViewController = false
for navController in navigationControllers {
if let dashboardVC = navController.viewControllers.first as? DashboardViewController {
foundDashboardViewController = true
break
}
}
return foundDashboardViewController
}
fileprivate func tabBarItem(atIndex index: Int) -> UITabBarItem? {
if (self.tabBar.items?.count ?? 0) > index {
if let item = self.tabBar.items?[index] {
return item
}
}
return nil
}
static func viewController(from data: RootViewControllerData) -> UIViewController? {
switch data {
case .discovery:
return DiscoveryViewController.instantiate()
case .activities:
return ActivitiesViewController.instantiate()
case .search:
return SearchViewController.instantiate()
case let .dashboard(isMember):
return isMember ? DashboardViewController.instantiate() : nil
case let .profile(isLoggedIn):
return isLoggedIn
? BackerDashboardViewController.instantiate()
: LoginToutViewController.configuredWith(loginIntent: .loginTab)
}
}
// MARK: - Accessors
public func didReceiveBadgeValue(_ value: Int?) {
self.viewModel.inputs.didReceiveBadgeValue(value)
}
}
extension RootTabBarViewController: UITabBarControllerDelegate {
public func tabBarController(
_ tabBarController: UITabBarController,
shouldSelect viewController: UIViewController
) -> Bool {
let index = tabBarController.viewControllers?.firstIndex(of: viewController)
self.viewModel.inputs.shouldSelect(index: index)
return true
}
public func tabBarController(
_ tabBarController: UITabBarController,
didSelect _: UIViewController
) {
self.viewModel.inputs.didSelect(index: tabBarController.selectedIndex)
}
public func tabBarController(
_: UITabBarController,
animationControllerForTransitionFrom _: UIViewController,
to _: UIViewController
) -> UIViewControllerAnimatedTransitioning? {
return CrossDissolveTransitionAnimator()
}
}
private func scrollToTop(_ viewController: UIViewController) {
if let scrollable = viewController as? TabBarControllerScrollable {
scrollable.scrollToTop()
}
}
private func tabbarAvatarImageFromData(_ data: Data) -> (defaultImage: UIImage?, selectedImage: UIImage?) {
let avatar = UIImage(data: data, scale: UIScreen.main.scale)?
.af.imageRoundedIntoCircle()
.af.imageAspectScaled(toFit: tabBarAvatarSize)
avatar?.af.inflate()
let deselectedImage = strokedRoundImage(
fromImage: avatar,
size: tabBarAvatarSize,
color: tabBarDeselectedColor
)
let selectedImage = strokedRoundImage(
fromImage: avatar,
size: tabBarAvatarSize,
color: tabBarSelectedColor,
lineWidth: 2.0
)
return (defaultImage: deselectedImage, selectedImage: selectedImage)
}
private func strokedRoundImage(
fromImage image: UIImage?,
size: CGSize,
color: UIColor,
lineWidth: CGFloat = 2.0
) -> UIImage? {
UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
defer { UIGraphicsEndImageContext() }
let innerRect = CGRect(x: 1.0, y: 1.0, width: size.width - 2.0, height: size.height - 2.0)
image?.draw(in: innerRect)
let circle = UIBezierPath(ovalIn: innerRect)
color.setStroke()
circle.lineWidth = lineWidth
circle.stroke()
return UIGraphicsGetImageFromCurrentImageContext()?.withRenderingMode(.alwaysOriginal)
}
private func extractViewController(_ viewController: UIViewController) -> UIViewController {
guard
let navigationController = viewController as? UINavigationController,
navigationController.viewControllers.count == 1,
let nestedViewController = navigationController.viewControllers.first else {
return viewController
}
return nestedViewController
}