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//
// CustomAlertController.swift
// MullvadVPN
//
// Created by Jon Petersson on 2023-05-19.
// Copyright © 2023 Mullvad VPN AB. All rights reserved.
//
import UIKit
class CustomAlertViewController: UIViewController {
typealias Handler = () -> Void
enum Icon {
case alert
case info
case spinner
fileprivate var image: UIImage? {
switch self {
case .alert:
return UIImage(named: "IconAlert")?.withTintColor(.dangerColor)
case .info:
return UIImage(named: "IconInfo")?.withTintColor(.white)
default:
return nil
}
}
}
enum ActionStyle {
case `default`
case destructive
fileprivate var buttonStyle: AppButton.Style {
switch self {
case .default:
return .default
case .destructive:
return .danger
}
}
}
var didDismiss: (() -> Void)?
private let containerView: UIStackView = {
let view = UIStackView()
view.axis = .vertical
view.backgroundColor = .secondaryColor
view.layer.cornerRadius = 11
view.spacing = UIMetrics.CustomAlert.containerSpacing
view.isLayoutMarginsRelativeArrangement = true
view.directionalLayoutMargins = UIMetrics.CustomAlert.containerMargins
return view
}()
private var handlers = [UIButton: Handler]()
init(header: String? = nil, title: String? = nil, message: String? = nil, icon: Icon? = nil) {
super.init(nibName: nil, bundle: nil)
setUp(header: header, title: title, icon: icon) {
message.flatMap { addMessage($0) }
}
}
init(header: String? = nil, title: String? = nil, attributedMessage: NSAttributedString?, icon: Icon? = nil) {
super.init(nibName: nil, bundle: nil)
setUp(header: header, title: title, icon: icon) {
attributedMessage.flatMap { addMessage($0) }
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// This code runs before viewDidLoad(). As such, no implicit calls to self.view should be made before this point.
private func setUp(header: String?, title: String?, icon: Icon?, addMessageCallback: () -> Void) {
modalPresentationStyle = .overFullScreen
modalTransitionStyle = .crossDissolve
icon.flatMap { addIcon($0) }
header.flatMap { addHeader($0) }
title.flatMap { addTitle($0) }
addMessageCallback()
containerView.arrangedSubviews.last.flatMap {
containerView.setCustomSpacing(UIMetrics.CustomAlert.containerMargins.top, after: $0)
}
// Icon only alerts should have equal top and bottom margin.
if icon != nil, containerView.arrangedSubviews.count == 1 {
containerView.directionalLayoutMargins.bottom = UIMetrics.CustomAlert.containerMargins.top
}
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .black.withAlphaComponent(0.5)
view.addConstrainedSubviews([containerView]) {
containerView.centerXAnchor.constraint(equalTo: view.centerXAnchor)
containerView.centerYAnchor.constraint(equalTo: view.centerYAnchor)
containerView.widthAnchor
.constraint(lessThanOrEqualToConstant: UIMetrics.preferredFormSheetContentSize.width)
containerView.leadingAnchor
.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor)
.withPriority(.defaultHigh)
view.layoutMarginsGuide.trailingAnchor
.constraint(equalTo: containerView.trailingAnchor)
.withPriority(.defaultHigh)
}
}
func addAction(title: String, style: ActionStyle, handler: (() -> Void)? = nil) {
// The presence of a button should reset any custom button margin to default.
containerView.directionalLayoutMargins.bottom = UIMetrics.CustomAlert.containerMargins.bottom
let button = AppButton(style: style.buttonStyle)
button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
button.setTitle(title, for: .normal)
containerView.addArrangedSubview(button)
handler.flatMap { handlers[button] = $0 }
}
private func addHeader(_ title: String) {
let header = UILabel()
header.text = title
header.font = .preferredFont(forTextStyle: .largeTitle, weight: .bold)
header.textColor = .white
header.adjustsFontForContentSizeCategory = true
header.textAlignment = .center
header.numberOfLines = 0
containerView.addArrangedSubview(header)
containerView.setCustomSpacing(16, after: header)
}
private func addTitle(_ title: String) {
let label = UILabel()
label.text = title
label.font = .preferredFont(forTextStyle: .title3, weight: .semibold)
label.textColor = .white.withAlphaComponent(0.9)
label.adjustsFontForContentSizeCategory = true
label.numberOfLines = 0
containerView.addArrangedSubview(label)
containerView.setCustomSpacing(8, after: label)
}
private func addMessage(_ message: String) {
let label = UILabel()
let font = UIFont.preferredFont(forTextStyle: .body)
let style = NSMutableParagraphStyle()
style.paragraphSpacing = 16
style.lineBreakMode = .byWordWrapping
label.attributedText = NSAttributedString(
markdownString: message,
options: MarkdownStylingOptions(font: font, paragraphStyle: style)
)
label.font = font
label.textColor = .white.withAlphaComponent(0.8)
label.adjustsFontForContentSizeCategory = true
label.numberOfLines = 0
containerView.addArrangedSubview(label)
}
private func addMessage(_ message: NSAttributedString) {
let label = UILabel()
label.attributedText = message
label.adjustsFontForContentSizeCategory = true
label.numberOfLines = 0
containerView.addArrangedSubview(label)
}
private func addIcon(_ icon: Icon) {
let iconView = icon == .spinner ? getSpinnerView() : getImageView(for: icon)
containerView.addArrangedSubview(iconView)
}
private func getImageView(for icon: Icon) -> UIView {
let imageView = UIImageView()
let imageContainerView = UIView()
imageContainerView.addConstrainedSubviews([imageView]) {
imageView.pinEdges(.init([.top(0), .bottom(0)]), to: imageContainerView)
imageView.centerXAnchor.constraint(equalTo: imageContainerView.centerXAnchor, constant: 0)
imageView.heightAnchor.constraint(equalToConstant: 44)
imageView.widthAnchor.constraint(equalTo: imageView.heightAnchor, multiplier: 1)
}
imageView.image = icon.image?.withRenderingMode(.alwaysOriginal)
imageView.contentMode = .scaleAspectFit
return imageContainerView
}
private func getSpinnerView() -> UIView {
let spinnerView = SpinnerActivityIndicatorView(style: .large)
let spinnerContainerView = UIView()
spinnerContainerView.addConstrainedSubviews([spinnerView]) {
spinnerView.pinEdges(.init([.top(0), .bottom(0)]), to: spinnerContainerView)
spinnerView.centerXAnchor.constraint(equalTo: spinnerContainerView.centerXAnchor, constant: 0)
}
spinnerView.startAnimating()
return spinnerContainerView
}
@objc private func didTapButton(_ button: AppButton) {
dismiss(animated: true) { [self] in
if let handler = handlers.removeValue(forKey: button) {
handler()
}
didDismiss?()
didDismiss = nil
handlers.removeAll()
}
}
}
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