122 lines
4.5 KiB
Swift
122 lines
4.5 KiB
Swift
@objc
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final class Toast: NSObject {
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@objc
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enum Alignment: Int {
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case bottom
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case top
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}
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private enum Constants {
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static let presentationDuration: TimeInterval = 3
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static let animationDuration: TimeInterval = kDefaultAnimationDuration
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static let bottomOffset: CGFloat = 63
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static let topOffset: CGFloat = 50
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static let horizontalOffset: CGFloat = 16
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static let labelOffsets = UIEdgeInsets(top: 10, left: 14, bottom: -10, right: -14)
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static let maxWidth: CGFloat = 400
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}
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private static var toasts: [Toast] = []
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private var blurView: UIVisualEffectView
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private init(_ text: String) {
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blurView = UIVisualEffectView(effect: UIBlurEffect(style: .dark))
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blurView.setStyle(.toastBackground)
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blurView.isUserInteractionEnabled = false
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blurView.alpha = 0
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blurView.translatesAutoresizingMaskIntoConstraints = false
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let label = UILabel()
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label.text = text
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label.setStyle(.toastLabel)
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label.numberOfLines = 0
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label.translatesAutoresizingMaskIntoConstraints = false
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label.setContentHuggingPriority(.defaultLow, for: .horizontal)
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blurView.contentView.addSubview(label)
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NSLayoutConstraint.activate([
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label.leadingAnchor.constraint(equalTo: blurView.contentView.leadingAnchor, constant: Constants.labelOffsets.left),
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label.trailingAnchor.constraint(equalTo: blurView.contentView.trailingAnchor, constant: Constants.labelOffsets.right),
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label.topAnchor.constraint(equalTo: blurView.contentView.topAnchor, constant: Constants.labelOffsets.top),
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label.bottomAnchor.constraint(equalTo: blurView.contentView.bottomAnchor, constant: Constants.labelOffsets.bottom)
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])
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}
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// MARK: - Public methods
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@objc
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static func show(withText text: String) {
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show(withText: text, alignment: .bottom)
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}
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@objc
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static func show(withText text: String, alignment: Alignment) {
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show(withText: text, alignment: alignment, pinToSafeArea: true)
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}
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@objc
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static func show(withText text: String, alignment: Alignment, pinToSafeArea: Bool) {
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let toast = Toast(text)
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toasts.append(toast)
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toast.show(withAlignment: alignment, pinToSafeArea: pinToSafeArea)
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}
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@objc
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static func hideAll() {
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toasts.forEach { $0.hide() }
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}
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// MARK: - Private methods
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private func show(withAlignment alignment: Alignment, pinToSafeArea: Bool) {
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Self.hideAll()
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guard let view = (UIApplication.shared.connectedScenes.filter { $0.activationState == .foregroundActive }.first(where: { $0 is UIWindowScene }) as? UIWindowScene)?.keyWindow else { return }
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view.addSubview(blurView)
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let leadingConstraint = blurView.leadingAnchor.constraint(greaterThanOrEqualTo: view.leadingAnchor, constant: Constants.horizontalOffset)
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let trailingConstraint = blurView.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor, constant: -Constants.horizontalOffset)
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let maxWidthConstraint = blurView.widthAnchor.constraint(equalToConstant: Constants.maxWidth).withPriority(.defaultLow)
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let verticalConstraint: NSLayoutConstraint
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switch alignment {
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case .bottom:
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verticalConstraint = blurView.bottomAnchor.constraint(equalTo: pinToSafeArea ? view.safeAreaLayoutGuide.bottomAnchor : view.bottomAnchor,
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constant: -Constants.bottomOffset)
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case .top:
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verticalConstraint = blurView.topAnchor.constraint(equalTo: pinToSafeArea ? view.safeAreaLayoutGuide.topAnchor : view.topAnchor,
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constant: Constants.topOffset)
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}
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NSLayoutConstraint.activate([
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leadingConstraint,
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trailingConstraint,
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maxWidthConstraint,
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verticalConstraint,
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blurView.centerXAnchor.constraint(equalTo: pinToSafeArea ? view.safeAreaLayoutGuide.centerXAnchor : view.centerXAnchor)
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])
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UIView.animate(withDuration: Constants.animationDuration, animations: {
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self.blurView.alpha = 1
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} , completion: { _ in
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DispatchQueue.main.asyncAfter(deadline: .now() + Constants.presentationDuration) {
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self.hide()
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}
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})
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}
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private func hide() {
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if self.blurView.superview != nil {
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UIView.animate(withDuration: Constants.animationDuration,
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animations: { self.blurView.alpha = 0 }) { [self] _ in
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self.blurView.removeFromSuperview()
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Self.toasts.removeAll(where: { $0 === self }) }
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}
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}
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}
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extension NSLayoutConstraint {
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func withPriority(_ priority: UILayoutPriority) -> NSLayoutConstraint {
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self.priority = priority
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return self
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}
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}
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