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//
// NotificationController.swift
// MullvadVPN
//
// Created by pronebird on 01/06/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import UIKit
struct InAppNotificationDescriptor: Equatable {
var identifier: String
var style: NotificationBannerStyle
var title: String
var body: String
}
class NotificationController: UIViewController, NotificationManagerDelegate {
let bannerView: NotificationBannerView = {
let bannerView = NotificationBannerView()
bannerView.translatesAutoresizingMaskIntoConstraints = false
bannerView.isHidden = true
bannerView.isAccessibilityElement = true
return bannerView
}()
private var showBannerConstraint: NSLayoutConstraint?
private var hideBannerConstraint: NSLayoutConstraint?
private(set) var showsBanner = false
private var lastNotification: InAppNotificationDescriptor?
override func loadView() {
view = NotificationContainerView(frame: UIScreen.main.bounds)
}
override func viewDidLoad() {
super.viewDidLoad()
showBannerConstraint = bannerView.topAnchor.constraint(equalTo: view.topAnchor)
hideBannerConstraint = bannerView.bottomAnchor.constraint(equalTo: view.topAnchor)
view.addSubview(bannerView)
let verticalConstraint = showsBanner ? showBannerConstraint : hideBannerConstraint
NSLayoutConstraint.activate([
verticalConstraint!,
bannerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
bannerView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
])
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
updateAccessibilityFrame()
}
func toggleBanner(show: Bool, animated: Bool, completion: (() -> Void)? = nil) {
guard showsBanner != show else {
completion?()
return
}
showsBanner = show
if show {
// Make sure to lay out the banner before animating its appearance to avoid undesired horizontal expansion
// animation.
view.layoutIfNeeded()
bannerView.isHidden = false
hideBannerConstraint?.isActive = false
showBannerConstraint?.isActive = true
} else {
showBannerConstraint?.isActive = false
hideBannerConstraint?.isActive = true
}
let finish = {
if !show {
self.bannerView.isHidden = true
}
completion?()
}
if animated {
let timing = UISpringTimingParameters(dampingRatio: 0.7, initialVelocity: CGVector(dx: 0, dy: 1))
let animator = UIViewPropertyAnimator(duration: 0.8, timingParameters: timing)
animator.isInterruptible = false
animator.addAnimations {
self.view.layoutIfNeeded()
}
animator.addCompletion { _ in
finish()
}
animator.startAnimation()
} else {
view.layoutIfNeeded()
finish()
}
}
func setNotification(_ notification: InAppNotificationDescriptor, animated: Bool) {
guard lastNotification != notification else { return }
lastNotification = notification
bannerView.title = notification.title
bannerView.body = notification.body
bannerView.style = notification.style
bannerView.accessibilityLabel = "\(notification.title)\n\(notification.body)"
if animated {
let animator = UIViewPropertyAnimator(duration: 0.25, timingParameters: UICubicTimingParameters(animationCurve: .easeOut))
animator.addAnimations {
self.view.layoutIfNeeded()
}
animator.startAnimation()
}
// Do not emit the .layoutChanged unless the banner is focused to avoid capturing the voice over focus.
if bannerView.accessibilityElementIsFocused() {
UIAccessibility.post(notification: .layoutChanged, argument: bannerView)
}
}
private func updateAccessibilityFrame() {
let layoutFrame = bannerView.layoutMarginsGuide.layoutFrame
bannerView.accessibilityFrame = UIAccessibility.convertToScreenCoordinates(layoutFrame, in: view)
}
private func setNotifications(_ notifications: [InAppNotificationDescriptor], animated: Bool) {
let nextNotification = notifications.first
if let notification = nextNotification {
setNotification(notification, animated: showsBanner)
toggleBanner(show: true, animated: true)
} else {
toggleBanner(show: false, animated: animated)
}
}
// MARK: - NotificationManagerDelegate
func notificationManagerDidUpdateInAppNotifications(_ manager: NotificationManager, notifications: [InAppNotificationDescriptor]) {
setNotifications(notifications, animated: true)
}
}
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