Tusker/Packages/Duckable/Sources/Duckable/DuckableContainerViewContro...

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8.9 KiB
Swift
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//
// DuckableContainerViewController.swift
// Duckable
//
// Created by Shadowfacts on 11/7/22.
//
import UIKit
let duckedCornerRadius: CGFloat = 10
let detentHeight: CGFloat = 44
@available(iOS 16.0, *)
public class DuckableContainerViewController: UIViewController, DuckableViewControllerDelegate {
public let child: UIViewController
private var bottomConstraint: NSLayoutConstraint!
private(set) var state = State.idle
public init(child: UIViewController) {
self.child = child
super.init(nibName: nil, bundle: nil)
swizzleSheetController()
}
required init?(coder: NSCoder) {
fatalError()
}
public override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .black
child.beginAppearanceTransition(true, animated: false)
addChild(child)
child.didMove(toParent: self)
child.view.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(child.view)
child.endAppearanceTransition()
bottomConstraint = child.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
NSLayoutConstraint.activate([
child.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
child.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
child.view.topAnchor.constraint(equalTo: view.topAnchor),
bottomConstraint,
])
}
func presentDuckable(_ viewController: DuckableViewController, animated: Bool, completion: (() -> Void)?) {
guard case .idle = state else {
if animated,
case .ducked(_, placeholder: let placeholder) = state {
UIImpactFeedbackGenerator(style: .soft).impactOccurred()
let origConstant = placeholder.topConstraint.constant
UIView.animateKeyframes(withDuration: 0.4, delay: 0) {
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5) {
placeholder.topConstraint.constant = origConstant - 20
self.view.layoutIfNeeded()
}
UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5) {
placeholder.topConstraint.constant = origConstant
self.view.layoutIfNeeded()
}
}
}
return
}
state = .presentingDucked(viewController, isFirstPresentation: true)
doPresentDuckable(viewController, animated: animated, completion: completion)
}
private func doPresentDuckable(_ viewController: DuckableViewController, animated: Bool, completion: (() -> Void)?) {
viewController.duckableDelegate = self
let nav = UINavigationController(rootViewController: viewController)
nav.modalPresentationStyle = .custom
nav.transitioningDelegate = self
present(nav, animated: animated) {
self.bottomConstraint.isActive = false
self.bottomConstraint = self.child.view.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor, constant: -detentHeight - 4)
self.bottomConstraint.isActive = true
completion?()
}
}
public func duckableViewControllerWillDismiss(animated: Bool) {
state = .idle
bottomConstraint.isActive = false
bottomConstraint = child.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
bottomConstraint.isActive = true
child.view.layer.cornerRadius = 0
setOverrideTraitCollection(nil, forChild: child)
}
func createPlaceholderForDuckedViewController(_ viewController: DuckableViewController) -> DuckedPlaceholderViewController {
let placeholder = DuckedPlaceholderViewController(for: viewController, owner: self)
placeholder.view.translatesAutoresizingMaskIntoConstraints = false
placeholder.beginAppearanceTransition(true, animated: false)
self.addChild(placeholder)
placeholder.didMove(toParent: self)
self.view.addSubview(placeholder.view)
placeholder.endAppearanceTransition()
let placeholderTopConstraint = placeholder.view.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor, constant: -detentHeight)
placeholder.topConstraint = placeholderTopConstraint
NSLayoutConstraint.activate([
placeholder.view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
placeholder.view.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
placeholder.view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
placeholderTopConstraint
])
// otherwise the layout changes get lumped in with the system animation
UIView.performWithoutAnimation {
self.view.layoutIfNeeded()
}
return placeholder
}
func duckViewController() {
guard case .presentingDucked(let viewController, isFirstPresentation: _) = state else {
return
}
let placeholder = createPlaceholderForDuckedViewController(viewController)
state = .ducked(viewController, placeholder: placeholder)
child.view.layer.cornerRadius = duckedCornerRadius
child.view.layer.maskedCorners = [.layerMinXMaxYCorner, .layerMaxXMaxYCorner]
child.view.layer.masksToBounds = true
dismiss(animated: true)
}
@objc func unduckViewController() {
guard case .ducked(let viewController, placeholder: let placeholder) = state else {
return
}
state = .presentingDucked(viewController, isFirstPresentation: false)
doPresentDuckable(viewController, animated: true) {
placeholder.view.removeFromSuperview()
placeholder.willMove(toParent: nil)
placeholder.removeFromParent()
}
}
func sheetOffsetDidChange() {
if case .presentingDucked(let duckable, isFirstPresentation: _) = state {
duckable.duckableViewControllerMayAttemptToDuck()
}
}
enum State {
case idle
case presentingDucked(DuckableViewController, isFirstPresentation: Bool)
case ducked(DuckableViewController, placeholder: DuckedPlaceholderViewController)
}
}
@available(iOS 16.0, *)
extension DuckableContainerViewController: UIViewControllerTransitioningDelegate {
public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
let controller = UISheetPresentationController(presentedViewController: presented, presenting: presenting)
controller.delegate = self
controller.prefersGrabberVisible = true
controller.selectedDetentIdentifier = .large
controller.largestUndimmedDetentIdentifier = .bottom
controller.detents = [
.custom(identifier: .bottom, resolver: { context in
return detentHeight
}),
.large(),
]
return controller
}
public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if case .ducked(_, placeholder: _) = state {
return DuckAnimationController(
owner: self,
needsShrinkAnimation: isDetentChangingDueToGrabberAction
)
} else {
return nil
}
}
}
@available(iOS 16.0, *)
extension DuckableContainerViewController: UISheetPresentationControllerDelegate {
public func presentationController(_ presentationController: UIPresentationController, willPresentWithAdaptiveStyle style: UIModalPresentationStyle, transitionCoordinator: UIViewControllerTransitionCoordinator?) {
let snapshot = child.view.snapshotView(afterScreenUpdates: false)!
snapshot.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(snapshot)
NSLayoutConstraint.activate([
snapshot.leadingAnchor.constraint(equalTo: child.view.leadingAnchor),
snapshot.trailingAnchor.constraint(equalTo: child.view.trailingAnchor),
snapshot.topAnchor.constraint(equalTo: child.view.topAnchor),
snapshot.bottomAnchor.constraint(equalTo: child.view.bottomAnchor),
])
setOverrideTraitCollection(UITraitCollection(userInterfaceLevel: .elevated), forChild: child)
transitionCoordinator!.animate { context in
snapshot.layer.opacity = 0
} completion: { _ in
snapshot.removeFromSuperview()
}
}
public func sheetPresentationControllerDidChangeSelectedDetentIdentifier(_ sheetPresentationController: UISheetPresentationController) {
if sheetPresentationController.selectedDetentIdentifier == .bottom {
duckViewController()
}
}
}