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mastodon-app-ufficiale-ipho.../MastodonSDK/Sources/MastodonUI/Service/KeyboardResponderService.swift

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