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import UIKit
import Combine
import DependencyInjection
public final class RootViewController: UIViewController {
@Dependency var barStylist: StatusBarStylist
@Dependency var toastDispatcher: ToastController
var toastTimer: Timer?
let content: UIViewController?
let toastTopPadding: CGFloat = 10
var cancellables = Set<AnyCancellable>()
var topToastConstraint: NSLayoutConstraint?
public init(_ content: UIViewController?) {
self.content = content
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) { nil }
public override var preferredStatusBarStyle: UIStatusBarStyle {
barStylist.styleSubject.value
}
public override func viewDidLoad() {
super.viewDidLoad()
if let content {
addChild(content)
view.addSubview(content.view)
content.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
content.view.frame = view.bounds
content.didMove(toParent: self)
} else {
view.isUserInteractionEnabled = false
}
barStylist
.styleSubject
.receive(on: DispatchQueue.main)
.sink { [weak self] _ in
UIView.animate(withDuration: 0.2) {
self?.setNeedsStatusBarAppearanceUpdate()
}
}.store(in: &cancellables)
toastDispatcher.currentToast
.receive(on: DispatchQueue.main)
.sink { [unowned self] model in
let toastView = ToastView(model: model)
add(toastView: toastView)
present(toastView: toastView)
}.store(in: &cancellables)
}
@objc private func didPanToast(_ sender: UIPanGestureRecognizer) {
guard let toastView = sender.view else { return }
switch sender.state {
case .began, .changed:
toastTimer?.invalidate()
let padding = toastTopPadding + min(0, sender.translation(in: view).y)
topToastConstraint?.constant = padding
case .cancelled, .ended, .failed:
let halfFrameHeight = -0.5 * toastView.frame.height
let verticalTranslation = sender.translation(in: toastView).y
let didSwipeAboveHalf = verticalTranslation < halfFrameHeight
if didSwipeAboveHalf {
dismiss(toastView: toastView)
} else {
present(toastView: toastView)
}
case .possible:
break
@unknown default:
break
}
}
private func dismiss(toastView: UIView) {
toastView.isUserInteractionEnabled = false
topToastConstraint?.constant = -(toastView.frame.height + view.safeAreaLayoutGuide.layoutFrame.minY)
topToastConstraint = nil
UIView.animate(withDuration: 0.25) {
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
} completion: { _ in
toastView.isUserInteractionEnabled = true
toastView.removeFromSuperview()
self.toastDispatcher.dismissCurrentToast()
}
}
private func add(toastView: UIView) {
let gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(didPanToast(_:)))
toastView.addGestureRecognizer(gestureRecognizer)
toastView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(toastView)
NSLayoutConstraint.activate([
toastView.heightAnchor.constraint(equalToConstant: 78),
toastView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 20),
toastView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: -20)
])
topToastConstraint = toastView.topAnchor.constraint(
equalTo: view.safeAreaLayoutGuide.topAnchor,
constant: -(toastView.frame.height + view.safeAreaLayoutGuide.layoutFrame.height)
)
topToastConstraint?.isActive = true
view.setNeedsLayout()
view.layoutIfNeeded()
}
private func present(toastView: UIView) {
toastView.isUserInteractionEnabled = false
topToastConstraint?.constant = toastTopPadding
UIView.animate(
withDuration: 0.5,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0.5,
options: .curveEaseInOut
) {
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
} completion: { _ in
toastView.isUserInteractionEnabled = true
self.toastTimer?.invalidate()
self.toastTimer = Timer.scheduledTimer(withTimeInterval: 5, repeats: false) { [weak self] _ in
guard let self = self else { return }
self.dismiss(toastView: toastView)
}
}
}
}