mastodon-ios/Mastodon/Scene/Discovery/DiscoveryViewController.swift

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//
// DiscoveryViewController.swift
// Mastodon
//
// Created by MainasuK on 2022-4-12.
//
import os.log
import UIKit
import Combine
import Tabman
import Pageboy
import MastodonAsset
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import MastodonCore
import MastodonUI
public class DiscoveryViewController: TabmanViewController, NeedsDependency {
public static let containerViewMarginForRegularHorizontalSizeClass: CGFloat = 64
public static let containerViewMarginForCompactHorizontalSizeClass: CGFloat = 16
var disposeBag = Set<AnyCancellable>()
let logger = Logger(subsystem: "DiscoveryViewController", category: "ViewController")
weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
var viewModel: DiscoveryViewModel!
private(set) lazy var buttonBar: TMBar.ButtonBar = {
let buttonBar = TMBar.ButtonBar()
buttonBar.backgroundView.style = .custom(view: buttonBarBackgroundView)
buttonBar.layout.interButtonSpacing = 0
buttonBar.layout.contentInset = .zero
buttonBar.indicator.backgroundColor = Asset.Colors.Label.primary.color
buttonBar.indicator.weight = .custom(value: 2)
return buttonBar
}()
let buttonBarBackgroundView: UIView = {
let view = UIView()
let barBottomLine = UIView.separatorLine
barBottomLine.backgroundColor = Asset.Colors.Label.secondary.color.withAlphaComponent(0.5)
barBottomLine.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(barBottomLine)
NSLayoutConstraint.activate([
barBottomLine.leadingAnchor.constraint(equalTo: view.leadingAnchor),
barBottomLine.trailingAnchor.constraint(equalTo: view.trailingAnchor),
barBottomLine.bottomAnchor.constraint(equalTo: view.bottomAnchor),
barBottomLine.heightAnchor.constraint(equalToConstant: 2).priority(.required - 1),
])
return view
}()
func customizeButtonBarAppearance() {
// The implmention use CATextlayer. Adapt for Dark Mode without dynamic colors
// Needs trigger update when `userInterfaceStyle` chagnes
let userInterfaceStyle = traitCollection.userInterfaceStyle
buttonBar.buttons.customize { button in
switch userInterfaceStyle {
case .dark:
// Asset.Colors.Label.primary.color
button.selectedTintColor = UIColor(red: 238.0/255.0, green: 238.0/255.0, blue: 238.0/255.0, alpha: 1.0)
// Asset.Colors.Label.secondary.color
button.tintColor = UIColor(red: 151.0/255.0, green: 157.0/255.0, blue: 173.0/255.0, alpha: 1.0)
default:
// Asset.Colors.Label.primary.color
button.selectedTintColor = UIColor(red: 40.0/255.0, green: 44.0/255.0, blue: 55.0/255.0, alpha: 1.0)
// Asset.Colors.Label.secondary.color
button.tintColor = UIColor(red: 60.0/255.0, green: 60.0/255.0, blue: 67.0/255.0, alpha: 0.6)
}
button.backgroundColor = .clear
button.contentInset = UIEdgeInsets(top: 12, left: 26, bottom: 12, right: 26)
}
}
}
extension DiscoveryViewController {
public override func viewDidLoad() {
super.viewDidLoad()
setupAppearance(theme: ThemeService.shared.currentTheme.value)
ThemeService.shared.currentTheme
.receive(on: DispatchQueue.main)
.sink { [weak self] theme in
guard let self = self else { return }
self.setupAppearance(theme: theme)
}
.store(in: &disposeBag)
dataSource = viewModel
addBar(
buttonBar,
dataSource: viewModel,
at: .top
)
customizeButtonBarAppearance()
viewModel.$viewControllers
.receive(on: DispatchQueue.main)
.sink { [weak self] _ in
guard let self = self else { return }
self.reloadData()
}
.store(in: &disposeBag)
}
public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
customizeButtonBarAppearance()
}
}
extension DiscoveryViewController {
private func setupAppearance(theme: Theme) {
view.backgroundColor = theme.secondarySystemBackgroundColor
buttonBarBackgroundView.backgroundColor = theme.systemBackgroundColor
}
}
// MARK: - ScrollViewContainer
extension DiscoveryViewController: ScrollViewContainer {
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var scrollView: UIScrollView {
return (currentViewController as? ScrollViewContainer)?.scrollView ?? UIScrollView()
}
func scrollToTop(animated: Bool) {
if scrollView.contentOffset.y <= 0 {
scrollToPage(.first, animated: animated)
} else {
scrollView.scrollToTop(animated: animated)
}
}
}
extension DiscoveryViewController {
public override var keyCommands: [UIKeyCommand]? {
return pageboyNavigateKeyCommands
}
}
// MARK: - PageboyNavigateable
extension DiscoveryViewController: PageboyNavigateable {
var navigateablePageViewController: PageboyViewController {
return self
}
@objc func pageboyNavigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
pageboyNavigateKeyCommandHandler(sender)
}
}