mirror of https://github.com/oxen-io/session-ios
Matthew Chen
8 years ago
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b0186754b8
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//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import MediaPlayer
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// A modal view that be used during blocking interactions (e.g. waiting on response from
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// service or on the completion of a long-running local operation).
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class ModalActivityIndicatorViewController: OWSViewController {
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let TAG = "[ModalActivityIndicatorViewController]"
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let canCancel: Bool
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public var wasCancelled: Bool = false
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var activityIndicator: UIActivityIndicatorView?
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var presentTimer: Timer?
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var wasDimissed: Bool = false
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// MARK: Initializers
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@available(*, unavailable, message:"use canCancel:completion: constructor instead.")
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required init?(coder aDecoder: NSCoder) {
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self.canCancel = false
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super.init(coder: aDecoder)
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owsFail("\(self.TAG) invalid constructor")
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}
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required init(canCancel: Bool) {
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self.canCancel = canCancel
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super.init(nibName: nil, bundle: nil)
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}
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public class func present(fromViewController: UIViewController,
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canCancel: Bool, presentCompletion : @escaping (ModalActivityIndicatorViewController) -> Void) {
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AssertIsOnMainThread()
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let view = ModalActivityIndicatorViewController(canCancel:canCancel)
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// Present this modal _over_ the current view contents.
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view.modalPresentationStyle = .overFullScreen
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fromViewController.present(view,
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animated: false) {
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presentCompletion(view)
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}
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}
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public func dismiss(completion : @escaping () -> Void) {
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AssertIsOnMainThread()
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if !wasDimissed {
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// Only dismiss once.
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self.dismiss(animated:false, completion: completion)
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wasDimissed = true
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} else {
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// If already dismissed, wait a beat then call completion.
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DispatchQueue.main.async {
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completion()
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}
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}
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}
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override func loadView() {
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super.loadView()
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self.view.backgroundColor = UIColor(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0.25)
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self.view.isOpaque = false
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let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle:.whiteLarge)
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self.activityIndicator = activityIndicator
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self.view.addSubview(activityIndicator)
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activityIndicator.autoCenterInSuperview()
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if canCancel {
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let cancelButton = UIButton(type:.custom)
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cancelButton.setTitle(CommonStrings.cancelButton, for: .normal)
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cancelButton.setTitleColor(UIColor.white, for: .normal)
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cancelButton.backgroundColor = UIColor.ows_darkGray()
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cancelButton.titleLabel?.font = UIFont.ows_mediumFont(withSize:ScaleFromIPhone5To7Plus(18, 22))
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cancelButton.layer.cornerRadius = ScaleFromIPhone5To7Plus(4, 5)
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cancelButton.clipsToBounds = true
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cancelButton.addTarget(self, action:#selector(cancelPressed), for:.touchUpInside)
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let buttonWidth = ScaleFromIPhone5To7Plus(140, 160)
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let buttonHeight = ScaleFromIPhone5To7Plus(40, 50)
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self.view.addSubview(cancelButton)
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cancelButton.autoHCenterInSuperview()
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cancelButton.autoPinEdge(toSuperviewEdge: .bottom, withInset:50)
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cancelButton.autoSetDimension(.width, toSize:buttonWidth)
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cancelButton.autoSetDimension(.height, toSize:buttonHeight)
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}
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// Hide the modal until the presentation animation completes.
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self.view.layer.opacity = 0.0
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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self.activityIndicator?.startAnimating()
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// Hide the the modal and wait for a second before revealing it,
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// to avoid "blipping" in the modal during short blocking operations.
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//
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// NOTE: It will still intercept user interactions while hidden, as it
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// should.
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let kPresentationDelaySeconds = TimeInterval(1)
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self.presentTimer?.invalidate()
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self.presentTimer = Timer.weakScheduledTimer(withTimeInterval: kPresentationDelaySeconds, target: self, selector: #selector(presentTimerFired), userInfo: nil, repeats: false)
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}
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override func viewWillDisappear(_ animated: Bool) {
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super.viewWillDisappear(animated)
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clearTimer()
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}
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override func viewDidDisappear(_ animated: Bool) {
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super.viewDidDisappear(animated)
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self.activityIndicator?.stopAnimating()
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clearTimer()
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}
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private func clearTimer() {
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self.presentTimer?.invalidate()
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self.presentTimer = nil
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}
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func presentTimerFired() {
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AssertIsOnMainThread()
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clearTimer()
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// Fade in the modal.
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UIView.animate(withDuration: 0.35) {
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self.view.layer.opacity = 1.0
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}
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}
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func cancelPressed() {
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AssertIsOnMainThread()
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wasCancelled = true
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dismiss {
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}
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}
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}
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