70 lines
2.6 KiB
Swift
70 lines
2.6 KiB
Swift
//
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// Copyright 2021-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import Foundation
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import CommonKit
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import UIKit
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/// A presenter responsible for showing / hiding a full-screen loading view that obscures (and thus disables) all other controls.
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/// It is managed by a `UserIndicator`, meaning the `present` and `dismiss` methods will be called when the parent `UserIndicator` starts or completes.
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class FullscreenLoadingViewPresenter: UserIndicatorViewPresentable {
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private let label: String
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private let presentationContext: UserIndicatorPresentationContext
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private weak var view: UIView?
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private var animator: UIViewPropertyAnimator?
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init(label: String, presentationContext: UserIndicatorPresentationContext) {
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self.label = label
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self.presentationContext = presentationContext
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}
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func present() {
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// Find the current top navigation controller
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var presentingController: UIViewController? = presentationContext.indicatorPresentingViewController
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while presentingController?.navigationController != nil {
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presentingController = presentingController?.navigationController
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}
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guard let presentingController = presentingController else {
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return
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}
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let view = LabelledActivityIndicatorView(text: label)
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view.update(theme: ThemeService.shared().theme)
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self.view = view
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view.translatesAutoresizingMaskIntoConstraints = false
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presentingController.view.addSubview(view)
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NSLayoutConstraint.activate([
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view.topAnchor.constraint(equalTo: presentingController.view.topAnchor),
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view.bottomAnchor.constraint(equalTo: presentingController.view.bottomAnchor),
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view.leadingAnchor.constraint(equalTo: presentingController.view.leadingAnchor),
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view.trailingAnchor.constraint(equalTo: presentingController.view.trailingAnchor)
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])
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view.alpha = 0
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animator = UIViewPropertyAnimator(duration: 0.2, curve: .easeOut) {
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view.alpha = 1
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}
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animator?.startAnimation()
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}
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func dismiss() {
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guard let view = view, view.superview != nil else {
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return
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}
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animator?.stopAnimation(true)
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animator = UIViewPropertyAnimator(duration: 0.2, curve: .easeIn) {
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view.alpha = 0
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}
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animator?.addCompletion { _ in
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view.removeFromSuperview()
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}
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animator?.startAnimation()
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}
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}
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