124 lines
4.4 KiB
Swift
124 lines
4.4 KiB
Swift
//
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// Copyright 2021-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import Foundation
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import SwiftUI
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import Combine
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/**
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UIHostingController that applies some app-level specific configuration
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(E.g. `vectorContent` modifier and theming to the NavigationController container.
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*/
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class VectorHostingController: UIHostingController<AnyView> {
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// MARK: Private
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private var theme: Theme
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private var heightSubject = CurrentValueSubject<CGFloat, Never>(0)
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// MARK: Public
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/// Wether or not the navigation bar should be hidden. Default `false`
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var isNavigationBarHidden: Bool = false
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/// Wether or not the title of the back item should be hidden. Default `false`
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var hidesBackTitleWhenPushed: Bool = false
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/// Defines the behaviour of the `VectorHostingController` as a bottom sheet. Default `nil`
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var bottomSheetPreferences: VectorHostingBottomSheetPreferences?
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/// Whether or not to use the iOS 15 style scroll edge appearance when the controller has a navigation bar.
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var enableNavigationBarScrollEdgeAppearance = false
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/// When non-nil, the style will be applied to the status bar.
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var statusBarStyle: UIStatusBarStyle?
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/// Whether or not to publish when the height of the view changes.
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var publishHeightChanges: Bool = false
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/// The publisher to subscribe to if `publishHeightChanges` is enabled.
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var heightPublisher: AnyPublisher<CGFloat, Never> {
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return heightSubject.eraseToAnyPublisher()
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}
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override var preferredStatusBarStyle: UIStatusBarStyle {
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statusBarStyle ?? super.preferredStatusBarStyle
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}
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/// Initializer
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/// - Parameter rootView: Root view for the controller.
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init<Content>(rootView: Content) where Content: View {
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self.theme = ThemeService.shared().theme
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super.init(rootView: AnyView(rootView.vectorContent()))
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("VectorHostingViewController does not currently support init from nibs")
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}
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// MARK: - Life cycle
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override func viewDidLoad() {
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super.viewDidLoad()
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self.view.backgroundColor = .clear
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self.registerThemeServiceDidChangeThemeNotification()
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self.update(theme: self.theme)
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bottomSheetPreferences?.setup(viewController: self)
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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if hidesBackTitleWhenPushed {
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vc_removeBackTitle()
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}
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if navigationController?.isNavigationBarHidden ?? false {
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navigationController?.interactivePopGestureRecognizer?.delegate = nil
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}
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}
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override func viewWillLayoutSubviews() {
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super.viewWillLayoutSubviews()
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guard
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let navigationController = navigationController,
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navigationController.topViewController == self,
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navigationController.isNavigationBarHidden != isNavigationBarHidden
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else { return }
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navigationController.isNavigationBarHidden = isNavigationBarHidden
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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// Fixes weird iOS 15 bug where the view no longer grows its enclosing host
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if #available(iOS 15.0, *) {
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self.view.invalidateIntrinsicContentSize()
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}
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if publishHeightChanges {
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let height = sizeThatFits(in: CGSize(width: self.view.frame.width, height: UIView.layoutFittingExpandedSize.height)).height
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heightSubject.send(height)
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}
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}
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private func registerThemeServiceDidChangeThemeNotification() {
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NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
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}
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@objc private func themeDidChange() {
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self.update(theme: ThemeService.shared().theme)
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}
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private func update(theme: Theme) {
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// Ensure dynamic colors are shown correctly when the theme is the opposite appearance to the system.
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overrideUserInterfaceStyle = theme.userInterfaceStyle
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if let navigationBar = self.navigationController?.navigationBar {
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theme.applyStyle(onNavigationBar: navigationBar, withModernScrollEdgeAppearance: enableNavigationBarScrollEdgeAppearance)
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}
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}
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}
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