137 lines
4.7 KiB
Swift
137 lines
4.7 KiB
Swift
//
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// KeyboardResponderService.swift
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// Mastodon
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//
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// Created by Cirno MainasuK on 2021-2-20.
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//
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import UIKit
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import Combine
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final public class KeyboardResponderService {
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var disposeBag = Set<AnyCancellable>()
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// MARK: - Singleton
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public static let shared = KeyboardResponderService()
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// output
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public let isShow = CurrentValueSubject<Bool, Never>(false)
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public let state = CurrentValueSubject<KeyboardState, Never>(.none)
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public let endFrame = CurrentValueSubject<CGRect, Never>(.zero)
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private init() {
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NotificationCenter.default.publisher(for: UIResponder.keyboardWillShowNotification, object: nil)
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.sink { notification in
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self.isShow.value = true
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self.updateInternalStatus(notification: notification)
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}
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.store(in: &disposeBag)
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NotificationCenter.default.publisher(for: UIResponder.keyboardDidHideNotification, object: nil)
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.sink { notification in
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self.isShow.value = false
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self.updateInternalStatus(notification: notification)
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}
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.store(in: &disposeBag)
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NotificationCenter.default.publisher(for: UIResponder.keyboardDidChangeFrameNotification, object: nil)
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.sink { notification in
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self.updateInternalStatus(notification: notification)
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}
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.store(in: &disposeBag)
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NotificationCenter.default.publisher(for: UIResponder.keyboardWillChangeFrameNotification, object: nil)
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.sink { notification in
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self.updateInternalStatus(notification: notification)
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}
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.store(in: &disposeBag)
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}
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}
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extension KeyboardResponderService {
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private func updateInternalStatus(notification: Notification) {
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guard let isLocal = notification.userInfo?[UIWindow.keyboardIsLocalUserInfoKey] as? Bool,
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let endFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else {
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return
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}
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self.endFrame.value = endFrame
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guard isLocal else {
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self.state.value = .notLocal
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return
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}
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// check if floating
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guard endFrame.width == UIScreen.main.bounds.width else {
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self.state.value = .floating
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return
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}
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// check if undock | split
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let dockMinY = UIScreen.main.bounds.height - endFrame.height
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if endFrame.minY < dockMinY {
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self.state.value = .notDock
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} else {
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self.state.value = .dock
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}
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}
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}
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extension KeyboardResponderService {
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public enum KeyboardState {
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case none
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case notLocal
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case notDock // undock | split
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case floating // iPhone size floating
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case dock
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}
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}
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extension KeyboardResponderService {
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public static func configure(
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scrollView: UIScrollView,
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layoutNeedsUpdate: AnyPublisher<Void, Never>,
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additionalSafeAreaInsets: AnyPublisher<UIEdgeInsets, Never> = CurrentValueSubject(.zero).eraseToAnyPublisher()
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) -> AnyCancellable {
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let tuple = Publishers.CombineLatest3(
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KeyboardResponderService.shared.isShow,
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KeyboardResponderService.shared.state,
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KeyboardResponderService.shared.endFrame
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)
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return Publishers.CombineLatest3(
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tuple,
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layoutNeedsUpdate,
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additionalSafeAreaInsets
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)
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.sink(receiveValue: { [weak scrollView] tuple, _, additionalSafeAreaInsets in
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guard let scrollView = scrollView else { return }
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guard let view = scrollView.superview else { return }
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let (isShow, state, endFrame) = tuple
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guard isShow, state == .dock else {
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scrollView.contentInset.bottom = additionalSafeAreaInsets.bottom
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scrollView.verticalScrollIndicatorInsets.bottom = additionalSafeAreaInsets.bottom
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return
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}
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// isShow AND dock state
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let contentFrame = view.convert(scrollView.frame, to: nil)
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let padding = contentFrame.maxY - endFrame.minY
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guard padding > 0 else {
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scrollView.contentInset.bottom = additionalSafeAreaInsets.bottom
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scrollView.verticalScrollIndicatorInsets.bottom = additionalSafeAreaInsets.bottom
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return
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}
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scrollView.contentInset.bottom = padding - scrollView.safeAreaInsets.bottom + additionalSafeAreaInsets.bottom
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scrollView.verticalScrollIndicatorInsets.bottom = padding - scrollView.safeAreaInsets.bottom + additionalSafeAreaInsets.bottom
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})
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}
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}
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