116 lines
3.9 KiB
Swift
116 lines
3.9 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import PromiseKit
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// The initial presentation is intended to be indistinguishable from the Launch Screen.
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// After a delay we present some "loading" UI so the user doesn't think the app is frozen.
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@objc
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public class LoadingViewController: UIViewController {
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var logoView: UIImageView!
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var topLabel: UILabel!
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var bottomLabel: UILabel!
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override public func loadView() {
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self.view = UIView()
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// Loki: Set gradient background
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view.backgroundColor = .clear
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let gradient = Gradients.defaultLokiBackground
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view.setGradient(gradient)
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self.logoView = UIImageView(image: #imageLiteral(resourceName: "SessionGreen64"))
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view.addSubview(logoView)
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logoView.autoCenterInSuperview()
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logoView.autoSetDimension(.width, toSize: 64)
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logoView.autoSetDimension(.height, toSize: 64)
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logoView.contentMode = .scaleAspectFit
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self.topLabel = buildLabel()
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topLabel.alpha = 0
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topLabel.font = UIFont.ows_dynamicTypeTitle2
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topLabel.text = NSLocalizedString("DATABASE_VIEW_OVERLAY_TITLE", comment: "Title shown while the app is updating its database.")
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self.bottomLabel = buildLabel()
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bottomLabel.alpha = 0
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bottomLabel.font = UIFont.ows_dynamicTypeBody
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bottomLabel.text = NSLocalizedString("DATABASE_VIEW_OVERLAY_SUBTITLE", comment: "Subtitle shown while the app is updating its database.")
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let labelStack = UIStackView(arrangedSubviews: [topLabel, bottomLabel])
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labelStack.axis = .vertical
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labelStack.alignment = .center
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labelStack.spacing = 8
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view.addSubview(labelStack)
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labelStack.autoPinEdge(.top, to: .bottom, of: logoView, withOffset: 20)
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labelStack.autoPinLeadingToSuperviewMargin()
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labelStack.autoPinTrailingToSuperviewMargin()
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labelStack.setCompressionResistanceHigh()
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labelStack.setContentHuggingHigh()
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}
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var isShowingTopLabel = false
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var isShowingBottomLabel = false
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override public func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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// We only show the "loading" UI if it's a slow launch. Otherwise this ViewController
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// should be indistinguishable from the launch screen.
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let kTopLabelThreshold: TimeInterval = 5
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DispatchQueue.main.asyncAfter(deadline: .now() + kTopLabelThreshold) { [weak self] in
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guard let strongSelf = self else {
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return
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}
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guard !strongSelf.isShowingTopLabel else {
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return
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}
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strongSelf.isShowingTopLabel = true
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UIView.animate(withDuration: 0.1) {
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strongSelf.topLabel.alpha = 1
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}
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UIView.animate(withDuration: 0.9, delay: 2, options: [.autoreverse, .repeat, .curveEaseInOut], animations: {
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strongSelf.topLabel.alpha = 0.2
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}, completion: nil)
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}
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let kBottomLabelThreshold: TimeInterval = 15
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DispatchQueue.main.asyncAfter(deadline: .now() + kBottomLabelThreshold) { [weak self] in
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guard let strongSelf = self else {
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return
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}
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guard !strongSelf.isShowingBottomLabel else {
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return
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}
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strongSelf.isShowingBottomLabel = true
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UIView.animate(withDuration: 0.1) {
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strongSelf.bottomLabel.alpha = 1
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}
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}
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}
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// MARK: Orientation
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override public var supportedInterfaceOrientations: UIInterfaceOrientationMask {
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return .portrait
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}
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// MARK:
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private func buildLabel() -> UILabel {
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let label = UILabel()
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label.textColor = .white
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label.numberOfLines = 0
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label.lineBreakMode = .byWordWrapping
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return label
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}
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}
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