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131 lines
4.5 KiB
Swift
Executable file
131 lines
4.5 KiB
Swift
Executable file
/*
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Copyright 2019 New Vector Ltd
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 Foundation
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import UIKit
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/// Used to present activity indicator on a view
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final class ActivityIndicatorPresenter: ActivityIndicatorPresenterType {
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// MARK: - Constants
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private enum Constants {
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static let animationDuration: TimeInterval = 0.3
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static let backgroundOverlayColor = UIColor.clear
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static let backgroundOverlayAlpha: CGFloat = 1.0
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}
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// MARK: - Properties
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private weak var backgroundOverlayView: UIView?
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private weak var activityIndicatorView: ActivityIndicatorView?
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private weak var presentingView: UIView?
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var isPresenting: Bool {
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return self.activityIndicatorView != nil
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}
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// MARK: - Public
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func presentActivityIndicator(on view: UIView, animated: Bool, completion: (() -> Void)? = nil) {
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if self.presentingView != nil {
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if let completion = completion {
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completion()
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}
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return
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}
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self.presentingView = view
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view.isUserInteractionEnabled = false
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let backgroundOverlayView = self.createBackgroundOverlayView(with: view.frame)
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let activityIndicatorView = ActivityIndicatorView()
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// Add activityIndicatorView on backgroundOverlayView centered
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backgroundOverlayView.addSubview(activityIndicatorView)
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activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
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activityIndicatorView.centerXAnchor.constraint(equalTo: backgroundOverlayView.centerXAnchor).isActive = true
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activityIndicatorView.centerYAnchor.constraint(equalTo: backgroundOverlayView.centerYAnchor).isActive = true
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activityIndicatorView.startAnimating()
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backgroundOverlayView.alpha = 0
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backgroundOverlayView.isHidden = false
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view.vc_addSubViewMatchingParent(backgroundOverlayView)
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self.backgroundOverlayView = backgroundOverlayView
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self.activityIndicatorView = activityIndicatorView
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let animationInstructions = {
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backgroundOverlayView.alpha = Constants.backgroundOverlayAlpha
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}
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if animated {
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UIView.animate(withDuration: Constants.animationDuration, animations: {
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animationInstructions()
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}, completion: { _ in
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completion?()
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})
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} else {
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animationInstructions()
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completion?()
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}
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}
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func removeCurrentActivityIndicator(animated: Bool, completion: (() -> Void)? = nil) {
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guard let presentingView = self.presentingView,
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let backgroundOverlayView = self.backgroundOverlayView,
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let activityIndicatorView = self.activityIndicatorView else {
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return
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}
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presentingView.isUserInteractionEnabled = true
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self.presentingView = nil
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let animationInstructions = {
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activityIndicatorView.alpha = 0
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}
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let animationCompletionInstructions = {
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activityIndicatorView.stopAnimating()
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backgroundOverlayView.isHidden = true
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backgroundOverlayView.removeFromSuperview()
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}
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if animated {
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UIView.animate(withDuration: Constants.animationDuration, animations: {
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animationInstructions()
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}, completion: { _ in
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animationCompletionInstructions()
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})
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} else {
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animationInstructions()
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animationCompletionInstructions()
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}
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}
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// MARK: - Private
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private func createBackgroundOverlayView(with frame: CGRect = CGRect.zero) -> UIView {
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let backgroundOverlayView = UIView(frame: frame)
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backgroundOverlayView.backgroundColor = Constants.backgroundOverlayColor
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backgroundOverlayView.alpha = Constants.backgroundOverlayAlpha
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return backgroundOverlayView
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}
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}
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