76 lines
2.9 KiB
Swift
76 lines
2.9 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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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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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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