273 lines
10 KiB
Swift
273 lines
10 KiB
Swift
//
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// LargeImageViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 8/31/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import UIKit
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class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeImageAnimatableViewController {
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weak var animationSourceView: UIImageView?
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var largeImageController: LargeImageViewController? { self }
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var animationImage: UIImage? { contentView.animationImage }
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var animationGifData: Data? { contentView.animationGifData }
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var dismissInteractionController: LargeImageInteractionController?
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@IBOutlet weak var scrollView: UIScrollView!
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@IBOutlet weak var topControlsView: UIView!
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@IBOutlet weak var topControlsHeightConstraint: NSLayoutConstraint!
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@IBOutlet weak var shareButton: UIButton!
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@IBOutlet weak var shareButtonTopConstraint: NSLayoutConstraint!
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@IBOutlet weak var shareButtonLeadingConstraint: NSLayoutConstraint!
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@IBOutlet weak var closeButton: UIButton!
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@IBOutlet weak var closeButtonTopConstraint: NSLayoutConstraint!
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@IBOutlet weak var closeButtonTrailingConstraint: NSLayoutConstraint!
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@IBOutlet weak var bottomControlsView: UIView!
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@IBOutlet weak var descriptionLabel: UILabel!
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var contentView: LargeImageContentView {
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didSet {
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oldValue.removeFromSuperview()
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setupContentView()
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}
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}
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var contentViewLeadingConstraint: NSLayoutConstraint!
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var contentViewTopConstraint: NSLayoutConstraint!
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var imageDescription: String?
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var initialControlsVisible = true
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private(set) var controlsVisible = true {
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didSet {
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setNeedsUpdateOfHomeIndicatorAutoHidden()
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}
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}
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var shrinkGestureEnabled = true
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private var prevZoomScale: CGFloat?
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private var isGrayscale = false
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var isInteractivelyAnimatingDismissal: Bool = false {
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didSet {
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setNeedsStatusBarAppearanceUpdate()
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}
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}
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override var prefersStatusBarHidden: Bool {
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return !isInteractivelyAnimatingDismissal
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}
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override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation {
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return .none
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}
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override var prefersHomeIndicatorAutoHidden: Bool {
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return !controlsVisible
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}
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init(contentView: LargeImageContentView, description: String?, sourceView: UIImageView?) {
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self.imageDescription = description
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self.animationSourceView = sourceView
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self.contentView = contentView
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super.init(nibName: "LargeImageViewController", bundle: nil)
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modalPresentationStyle = .fullScreen
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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setupContentView()
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setControlsVisible(initialControlsVisible, animated: false)
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shareButton.isEnabled = !contentView.activityItemsForSharing.isEmpty
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scrollView.delegate = self
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if let imageDescription = imageDescription,
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!imageDescription.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
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descriptionLabel.text = imageDescription.trimmingCharacters(in: .whitespacesAndNewlines)
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} else {
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bottomControlsView.isHidden = true
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}
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if shrinkGestureEnabled {
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dismissInteractionController = LargeImageInteractionController(viewController: self)
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}
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view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(scrollViewPressed(_:))))
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let doubleTap = UITapGestureRecognizer(target: self, action: #selector(scrollViewDoubleTapped(_:)))
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doubleTap.numberOfTapsRequired = 2
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view.addGestureRecognizer(doubleTap)
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NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
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}
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private func setupContentView() {
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contentView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.addSubview(contentView)
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contentViewLeadingConstraint = contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor)
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contentViewTopConstraint = contentView.topAnchor.constraint(equalTo: scrollView.topAnchor)
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NSLayoutConstraint.activate([
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contentViewLeadingConstraint,
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contentViewTopConstraint,
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])
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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// todo: does this need to be in viewDidLayoutSubviews?
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// limit the image height to the safe area height, so the image doesn't overlap the top controls
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// while zoomed all the way out
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let maxHeight = view.bounds.height - view.safeAreaInsets.top - view.safeAreaInsets.bottom
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let heightScale = maxHeight / contentView.intrinsicContentSize.height
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let widthScale = view.bounds.width / contentView.intrinsicContentSize.width
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let minScale = min(widthScale, heightScale)
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scrollView.minimumZoomScale = minScale
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scrollView.zoomScale = minScale
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scrollView.maximumZoomScale = minScale >= 1 ? minScale + 2 : 2
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centerImage()
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// todo: does this need to be in viewDidLayoutSubviews?
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let notchedDeviceTopInsets: [CGFloat] = [
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44, // iPhone X, Xs, Xs Max, 11 Pro, 11 Pro Max
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48, // iPhone XR, 11
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47, // iPhone 12, 12 Pro, 12 Pro Max, 13, 13 Pro, 13 Pro Max
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50, // iPhone 12 mini, 13 mini
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]
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if notchedDeviceTopInsets.contains(view.safeAreaInsets.top) {
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// the notch width is not the same for the iPhones 13,
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// but what we actually want is the same offset from the edges
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// since the corner radius didn't change
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let notchWidth: CGFloat = 210
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let earWidth = (view.bounds.width - notchWidth) / 2
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let offset = (earWidth - shareButton.bounds.width) / 2
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shareButtonLeadingConstraint.constant = offset
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closeButtonTrailingConstraint.constant = offset
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}
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}
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@objc private func preferencesChanged() {
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if isGrayscale != Preferences.shared.grayscaleImages {
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isGrayscale = Preferences.shared.grayscaleImages
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contentView.grayscaleStateChanged()
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}
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}
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func setControlsVisible(_ controlsVisible: Bool, animated: Bool) {
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self.controlsVisible = controlsVisible
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if animated {
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UIView.animate(withDuration: 0.2) {
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self.updateControlsView()
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}
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} else {
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updateControlsView()
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}
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}
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func updateControlsView() {
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let topOffset = self.controlsVisible ? 0 : -self.topControlsView.bounds.height
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self.topControlsView.transform = CGAffineTransform(translationX: 0, y: topOffset)
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if self.imageDescription != nil {
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let bottomOffset = self.controlsVisible ? 0 : self.bottomControlsView.bounds.height + self.view.safeAreaInsets.bottom
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self.bottomControlsView.transform = CGAffineTransform(translationX: 0, y: bottomOffset)
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}
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}
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func viewForZooming(in scrollView: UIScrollView) -> UIView? {
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return contentView
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}
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func scrollViewDidZoom(_ scrollView: UIScrollView) {
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centerImage()
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let prevZoomScale = self.prevZoomScale ?? scrollView.minimumZoomScale
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if scrollView.zoomScale <= scrollView.minimumZoomScale {
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setControlsVisible(true, animated: true)
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} else if scrollView.zoomScale > prevZoomScale {
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setControlsVisible(false, animated: true)
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}
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self.prevZoomScale = scrollView.zoomScale
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}
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func centerImage() {
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let yOffset = max(0, (view.bounds.size.height - contentView.frame.height) / 2)
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contentViewTopConstraint.constant = yOffset
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let xOffset = max(0, (view.bounds.size.width - contentView.frame.width) / 2)
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contentViewLeadingConstraint.constant = xOffset
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}
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func zoomRectFor(scale: CGFloat, center: CGPoint) -> CGRect {
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var zoomRect = CGRect.zero
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zoomRect.size.width = contentView.frame.width / scale
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zoomRect.size.height = contentView.frame.height / scale
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let newCenter = scrollView.convert(center, to: contentView)
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zoomRect.origin.x = newCenter.x - (zoomRect.width / 2)
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zoomRect.origin.y = newCenter.y - (zoomRect.height / 2)
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return zoomRect
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}
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// MARK: Interaction
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func animateZoomOut() {
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UIView.animate(withDuration: 0.3, animations: {
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self.scrollView.zoomScale = self.scrollView.minimumZoomScale
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self.view.layoutIfNeeded()
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})
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}
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@objc func scrollViewPressed(_ sender: UITapGestureRecognizer) {
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if scrollView.zoomScale > scrollView.minimumZoomScale {
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animateZoomOut()
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} else {
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setControlsVisible(!controlsVisible, animated: true)
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}
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}
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@objc func scrollViewDoubleTapped(_ recognizer: UITapGestureRecognizer) {
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if scrollView.zoomScale <= scrollView.minimumZoomScale {
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let point = recognizer.location(in: recognizer.view)
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let scale: CGFloat
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if scrollView.minimumZoomScale < 1 {
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if 1 - scrollView.zoomScale <= 0.5 {
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scale = scrollView.zoomScale + 1
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} else {
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scale = 1
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}
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} else {
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scale = scrollView.maximumZoomScale
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}
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let rect = zoomRectFor(scale: scale, center: point)
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UIView.animate(withDuration: 0.3) {
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self.scrollView.zoom(to: rect, animated: false)
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self.view.layoutIfNeeded()
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}
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} else {
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animateZoomOut()
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}
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}
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@IBAction func closeButtonPressed(_ sender: Any) {
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dismiss(animated: true)
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}
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@IBAction func sharePressed(_ sender: Any) {
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let activityVC = UIActivityViewController(activityItems: contentView.activityItemsForSharing, applicationActivities: nil)
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activityVC.popoverPresentationController?.sourceView = shareButton
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present(activityVC, animated: true)
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}
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}
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