571 lines
24 KiB
Swift
571 lines
24 KiB
Swift
//
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// GalleryItemViewController.swift
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// GalleryVC
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//
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// Created by Shadowfacts on 12/28/23.
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//
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import UIKit
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import AVFoundation
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@MainActor
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protocol GalleryItemViewControllerDelegate: AnyObject {
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func isGalleryBeingPresented() -> Bool
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func addPresentationAnimationCompletion(_ block: @escaping () -> Void)
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func galleryItemClose(_ item: GalleryItemViewController)
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func galleryItemApplicationActivities(_ item: GalleryItemViewController) -> [UIActivity]?
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}
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class GalleryItemViewController: UIViewController {
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private weak var delegate: GalleryItemViewControllerDelegate?
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let itemIndex: Int
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let content: GalleryContentViewController
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private var overlayVC: UIViewController?
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private var activityIndicator: UIActivityIndicatorView?
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private(set) var scrollView: UIScrollView!
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private var topControlsView: UIView!
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private var shareButton: UIButton!
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private var shareButtonLeadingConstraint: NSLayoutConstraint!
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private var shareButtonTopConstraint: NSLayoutConstraint!
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private var closeButtonTrailingConstraint: NSLayoutConstraint!
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private var closeButtonTopConstraint: NSLayoutConstraint!
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private var bottomControlsView: UIStackView!
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private(set) var captionTextView: UITextView!
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private var singleTap: UITapGestureRecognizer!
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private var doubleTap: UITapGestureRecognizer!
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private var contentViewLeadingConstraint: NSLayoutConstraint?
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private var contentViewTopConstraint: NSLayoutConstraint?
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private(set) var controlsVisible: Bool = true
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private(set) var scrollAndZoomEnabled = true
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private var scrollViewSizeForLastZoomScaleUpdate: CGSize?
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override var prefersHomeIndicatorAutoHidden: Bool {
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return !controlsVisible
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}
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init(delegate: GalleryItemViewControllerDelegate, itemIndex: Int, content: GalleryContentViewController) {
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self.delegate = delegate
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self.itemIndex = itemIndex
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self.content = content
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super.init(nibName: nil, bundle: nil)
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content.container = self
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}
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required init?(coder: 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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scrollView = UIScrollView()
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scrollView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.delegate = self
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view.addSubview(scrollView)
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addContent()
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centerContent()
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overlayVC = content.contentOverlayAccessoryViewController
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if let overlayVC {
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overlayVC.view.isHidden = activityIndicator != nil
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overlayVC.view.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(overlayVC.view)
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NSLayoutConstraint.activate([
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overlayVC.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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overlayVC.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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overlayVC.view.topAnchor.constraint(equalTo: view.topAnchor),
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overlayVC.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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}
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topControlsView = UIView()
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topControlsView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(topControlsView)
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var shareConfig = UIButton.Configuration.gray()
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shareConfig.cornerStyle = .dynamic
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shareConfig.background.backgroundColor = .black.withAlphaComponent(0.25)
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shareConfig.baseForegroundColor = .white
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shareConfig.image = UIImage(systemName: "square.and.arrow.up")
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shareConfig.contentInsets = NSDirectionalEdgeInsets(top: 4, leading: 4, bottom: 4, trailing: 4)
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shareButton = UIButton(configuration: shareConfig)
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shareButton.addTarget(self, action: #selector(shareButtonPressed), for: .touchUpInside)
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shareButton.isPointerInteractionEnabled = true
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shareButton.pointerStyleProvider = { button, effect, shape in
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return UIPointerStyle(effect: .highlight(effect.preview), shape: .roundedRect(button.frame))
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}
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shareButton.preferredBehavioralStyle = .pad
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shareButton.translatesAutoresizingMaskIntoConstraints = false
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updateShareButton()
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topControlsView.addSubview(shareButton)
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var closeConfig = UIButton.Configuration.gray()
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closeConfig.cornerStyle = .dynamic
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closeConfig.background.backgroundColor = .black.withAlphaComponent(0.25)
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closeConfig.baseForegroundColor = .white
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closeConfig.image = UIImage(systemName: "xmark")
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closeConfig.contentInsets = NSDirectionalEdgeInsets(top: 4, leading: 4, bottom: 4, trailing: 4)
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let closeButton = UIButton(configuration: closeConfig)
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closeButton.addTarget(self, action: #selector(closeButtonPressed), for: .touchUpInside)
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closeButton.isPointerInteractionEnabled = true
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closeButton.pointerStyleProvider = { button, effect, shape in
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return UIPointerStyle(effect: .highlight(effect.preview), shape: .roundedRect(button.frame))
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}
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closeButton.preferredBehavioralStyle = .pad
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closeButton.translatesAutoresizingMaskIntoConstraints = false
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topControlsView.addSubview(closeButton)
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bottomControlsView = UIStackView()
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bottomControlsView.translatesAutoresizingMaskIntoConstraints = false
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bottomControlsView.axis = .vertical
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bottomControlsView.alignment = .fill
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bottomControlsView.backgroundColor = .black.withAlphaComponent(0.5)
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view.addSubview(bottomControlsView)
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if let controlsAccessory = content.bottomControlsAccessoryViewController {
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addChild(controlsAccessory)
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bottomControlsView.addArrangedSubview(controlsAccessory.view)
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controlsAccessory.didMove(toParent: self)
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// Make sure the controls accessory is within the safe area.
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let spacer = UIView()
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bottomControlsView.addArrangedSubview(spacer)
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let spacerTopConstraint = spacer.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
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spacerTopConstraint.priority = .init(999)
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spacerTopConstraint.isActive = true
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}
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captionTextView = UITextView()
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captionTextView.backgroundColor = .clear
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captionTextView.textColor = .white
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captionTextView.isEditable = false
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captionTextView.isSelectable = true
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captionTextView.font = .preferredFont(forTextStyle: .body)
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captionTextView.adjustsFontForContentSizeCategory = true
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captionTextView.alwaysBounceVertical = true
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updateCaptionTextView()
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bottomControlsView.addArrangedSubview(captionTextView)
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#if targetEnvironment(macCatalyst)
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closeButtonTopConstraint = closeButton.topAnchor.constraint(equalTo: topControlsView.safeAreaLayoutGuide.topAnchor)
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shareButtonTopConstraint = shareButton.topAnchor.constraint(equalTo: topControlsView.safeAreaLayoutGuide.topAnchor)
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#else
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closeButtonTopConstraint = closeButton.topAnchor.constraint(equalTo: topControlsView.topAnchor)
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shareButtonTopConstraint = shareButton.topAnchor.constraint(equalTo: topControlsView.topAnchor)
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#endif
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closeButtonTrailingConstraint = topControlsView.trailingAnchor.constraint(equalTo: closeButton.trailingAnchor)
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shareButtonLeadingConstraint = shareButton.leadingAnchor.constraint(equalTo: topControlsView.leadingAnchor)
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NSLayoutConstraint.activate([
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scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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scrollView.topAnchor.constraint(equalTo: view.topAnchor),
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scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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topControlsView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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topControlsView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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topControlsView.topAnchor.constraint(equalTo: view.topAnchor),
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shareButtonLeadingConstraint,
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shareButtonTopConstraint,
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shareButton.bottomAnchor.constraint(equalTo: topControlsView.bottomAnchor),
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shareButton.widthAnchor.constraint(equalTo: shareButton.heightAnchor),
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closeButtonTrailingConstraint,
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closeButtonTopConstraint,
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closeButton.bottomAnchor.constraint(equalTo: topControlsView.bottomAnchor),
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closeButton.widthAnchor.constraint(equalTo: closeButton.heightAnchor),
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bottomControlsView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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bottomControlsView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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bottomControlsView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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captionTextView.heightAnchor.constraint(equalToConstant: 150),
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])
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updateTopControlsInsets()
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singleTap = UITapGestureRecognizer(target: self, action: #selector(viewPressed))
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singleTap.delegate = self
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doubleTap = UITapGestureRecognizer(target: self, action: #selector(viewDoublePressed))
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doubleTap.delegate = self
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doubleTap.numberOfTapsRequired = 2
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// This is needed to prevent a delay between tapping a button on and the action firing on Catalyst and Designed for iPad
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doubleTap.delaysTouchesEnded = false
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// this requirement is needed to make sure the double tap is ever recognized
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singleTap.require(toFail: doubleTap)
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view.addGestureRecognizer(singleTap)
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view.addGestureRecognizer(doubleTap)
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}
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override func viewSafeAreaInsetsDidChange() {
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super.viewSafeAreaInsetsDidChange()
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updateZoomScale(resetZoom: false)
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// Ensure the transform is correct if the controls are hidden
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setControlsVisible(controlsVisible, animated: false, dueToUserInteraction: false)
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updateTopControlsInsets()
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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// When the scrollView size changes, make sure the zoom scale is up-to-date since it depends on the scrollView's bounds.
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// This might also fix an issue on macOS (Designed for iPad) where the content isn't placed correctly. See #446
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if scrollViewSizeForLastZoomScaleUpdate != scrollView.bounds.size {
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scrollViewSizeForLastZoomScaleUpdate = scrollView.bounds.size
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updateZoomScale(resetZoom: true)
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}
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centerContent()
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// Ensure the transform is correct if the controls are hidden and their size changed.
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setControlsVisible(controlsVisible, animated: false, dueToUserInteraction: false)
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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if controlsVisible && !captionTextView.isHidden {
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captionTextView.flashScrollIndicators()
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}
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}
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func takeContent() -> GalleryContentViewController {
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content.willMove(toParent: nil)
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content.removeFromParent()
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content.view.removeFromSuperview()
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return content
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}
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func addContent() {
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content.loadViewIfNeeded()
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content.setControlsVisible(controlsVisible, animated: false, dueToUserInteraction: false)
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content.view.translatesAutoresizingMaskIntoConstraints = false
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if content.parent != self {
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addChild(content)
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content.didMove(toParent: self)
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}
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if scrollAndZoomEnabled {
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scrollView.addSubview(content.view)
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contentViewLeadingConstraint = content.view.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor)
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contentViewLeadingConstraint!.isActive = true
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contentViewTopConstraint = content.view.topAnchor.constraint(equalTo: scrollView.topAnchor)
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contentViewTopConstraint!.isActive = true
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updateZoomScale(resetZoom: true)
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} else {
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// If the content was previously added, deactivate the old constraints.
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contentViewLeadingConstraint?.isActive = false
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contentViewTopConstraint?.isActive = false
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view.addSubview(content.view)
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NSLayoutConstraint.activate([
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content.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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content.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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content.view.topAnchor.constraint(equalTo: view.topAnchor),
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content.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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}
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if let overlayVC {
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NSLayoutConstraint.activate([
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overlayVC.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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overlayVC.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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overlayVC.view.topAnchor.constraint(equalTo: view.topAnchor),
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overlayVC.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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}
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content.view.layoutIfNeeded()
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}
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func setControlsVisible(_ visible: Bool, animated: Bool, dueToUserInteraction: Bool) {
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controlsVisible = visible
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guard let topControlsView,
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let bottomControlsView else {
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return
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}
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func updateControlsViews() {
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topControlsView.transform = CGAffineTransform(translationX: 0, y: visible ? 0 : -topControlsView.bounds.height)
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bottomControlsView.transform = CGAffineTransform(translationX: 0, y: visible ? 0 : bottomControlsView.bounds.height)
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content.setControlsVisible(visible, animated: animated, dueToUserInteraction: dueToUserInteraction)
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}
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if animated {
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let animator = UIViewPropertyAnimator(duration: 0.2, timingParameters: UISpringTimingParameters())
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animator.addAnimations(updateControlsViews)
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animator.startAnimation()
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} else {
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updateControlsViews()
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}
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setNeedsUpdateOfHomeIndicatorAutoHidden()
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}
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func updateZoomScale(resetZoom: Bool) {
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scrollView.contentSize = content.contentSize
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guard scrollAndZoomEnabled else {
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scrollView.maximumZoomScale = 1
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scrollView.minimumZoomScale = 1
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scrollView.zoomScale = 1
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return
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}
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guard content.contentSize.width > 0 && content.contentSize.height > 0 else {
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return
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}
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let heightScale = view.bounds.height / content.contentSize.height
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let widthScale = view.bounds.width / content.contentSize.width
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let minScale = min(widthScale, heightScale)
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let maxScale = minScale >= 1 ? minScale + 2 : 2
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scrollView.minimumZoomScale = minScale
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scrollView.maximumZoomScale = maxScale
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if resetZoom {
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scrollView.zoomScale = minScale
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} else {
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scrollView.zoomScale = max(minScale, min(maxScale, scrollView.zoomScale))
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}
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centerContent()
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}
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private func centerContent() {
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guard scrollAndZoomEnabled else {
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return
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}
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// Note: use frame for the content.view, because that's in the coordinate space of the scroll view
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// which means it's already been scaled by the zoom factor.
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let yOffset = max(0, (view.bounds.height - content.view.frame.height) / 2)
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contentViewTopConstraint!.constant = yOffset
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let xOffset = max(0, (view.bounds.width - content.view.frame.width) / 2)
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contentViewLeadingConstraint!.constant = xOffset
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}
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private func updateShareButton() {
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shareButton.isEnabled = !content.activityItemsForSharing.isEmpty
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}
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private func updateCaptionTextView() {
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guard let caption = content.caption,
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!caption.isEmpty else {
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captionTextView.isHidden = true
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return
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}
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captionTextView.text = caption
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}
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private func updateTopControlsInsets() {
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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, 14, 14 Plus
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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.imageView?.bounds.width ?? 0)) / 2
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shareButtonLeadingConstraint.constant = offset
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closeButtonTrailingConstraint.constant = offset
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} else if view.safeAreaInsets.top == 0 {
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// square corner devices
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shareButtonLeadingConstraint.constant = 8
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shareButtonTopConstraint.constant = 8
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closeButtonTrailingConstraint.constant = 8
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closeButtonTopConstraint.constant = 8
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} else {
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// dynamic island devices
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shareButtonLeadingConstraint.constant = 24
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shareButtonTopConstraint.constant = 24
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closeButtonTrailingConstraint.constant = 24
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closeButtonTopConstraint.constant = 24
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}
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}
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private func zoomRectFor(scale: CGFloat, center: CGPoint) -> CGRect {
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var zoomRect = CGRect.zero
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zoomRect.size.width = content.view.frame.width / scale
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zoomRect.size.height = content.view.frame.height / scale
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let newCenter = scrollView.convert(center, to: content.view)
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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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private func animateZoomOut() {
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let animator = UIViewPropertyAnimator(duration: 0.3, timingParameters: UISpringTimingParameters())
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animator.addAnimations {
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self.scrollView.zoomScale = self.scrollView.minimumZoomScale
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self.scrollView.layoutIfNeeded()
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}
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animator.startAnimation()
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}
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// MARK: Interaction
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@objc private func viewPressed() {
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if scrollAndZoomEnabled,
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scrollView.zoomScale > scrollView.minimumZoomScale {
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animateZoomOut()
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} else {
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setControlsVisible(!controlsVisible, animated: true, dueToUserInteraction: true)
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}
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}
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@objc private func viewDoublePressed(_ recognizer: UITapGestureRecognizer) {
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guard scrollAndZoomEnabled else {
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return
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}
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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 = min(
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max(
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scrollView.bounds.width / content.contentSize.width,
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scrollView.bounds.height / content.contentSize.height,
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scrollView.zoomScale + 0.75
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),
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scrollView.maximumZoomScale
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)
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let rect = zoomRectFor(scale: scale, center: point)
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let animator = UIViewPropertyAnimator(duration: 0.3, timingParameters: UISpringTimingParameters())
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animator.addAnimations {
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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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animator.startAnimation()
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} else {
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animateZoomOut()
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}
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}
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@objc private func closeButtonPressed() {
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delegate?.galleryItemClose(self)
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}
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@objc private func shareButtonPressed() {
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let items = content.activityItemsForSharing
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guard !items.isEmpty else {
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return
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}
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let activityVC = UIActivityViewController(activityItems: items, applicationActivities: delegate?.galleryItemApplicationActivities(self))
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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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extension GalleryItemViewController: GalleryContentViewControllerContainer {
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var galleryControlsVisible: Bool {
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controlsVisible
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}
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func setGalleryContentLoading(_ loading: Bool) {
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if loading {
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overlayVC?.view.isHidden = true
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if activityIndicator == nil {
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let activityIndicator = UIActivityIndicatorView(style: .large)
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self.activityIndicator = activityIndicator
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activityIndicator.startAnimating()
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activityIndicator.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(activityIndicator)
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NSLayoutConstraint.activate([
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activityIndicator.centerXAnchor.constraint(equalTo: view.centerXAnchor),
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activityIndicator.centerYAnchor.constraint(equalTo: view.centerYAnchor),
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])
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}
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} else {
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if let activityIndicator {
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// If we're in the middle of the presentation animation,
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// wait until it finishes to hide the loading indicator.
|
|
// Since the updated content frame won't affect the animation,
|
|
// make sure the loading indicator remains visible.
|
|
if let delegate,
|
|
delegate.isGalleryBeingPresented() {
|
|
delegate.addPresentationAnimationCompletion { [unowned self] in
|
|
self.setGalleryContentLoading(false)
|
|
}
|
|
} else {
|
|
activityIndicator.removeFromSuperview()
|
|
self.activityIndicator = nil
|
|
self.overlayVC?.view.isHidden = false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func galleryContentChanged() {
|
|
updateZoomScale(resetZoom: true)
|
|
updateShareButton()
|
|
updateCaptionTextView()
|
|
}
|
|
|
|
func disableGalleryScrollAndZoom() {
|
|
scrollAndZoomEnabled = false
|
|
updateZoomScale(resetZoom: true)
|
|
scrollView.isScrollEnabled = false
|
|
// Make sure the content is re-added with the correct constraints
|
|
if content.parent == self {
|
|
addContent()
|
|
}
|
|
}
|
|
|
|
func setGalleryControlsVisible(_ visible: Bool, animated: Bool) {
|
|
setControlsVisible(visible, animated: animated, dueToUserInteraction: false)
|
|
}
|
|
}
|
|
|
|
extension GalleryItemViewController: UIScrollViewDelegate {
|
|
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
|
|
if scrollAndZoomEnabled {
|
|
return content.view
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func scrollViewDidZoom(_ scrollView: UIScrollView) {
|
|
if scrollView.zoomScale <= scrollView.minimumZoomScale {
|
|
setControlsVisible(true, animated: true, dueToUserInteraction: true)
|
|
} else {
|
|
setControlsVisible(false, animated: true, dueToUserInteraction: true)
|
|
}
|
|
|
|
centerContent()
|
|
scrollView.layoutIfNeeded()
|
|
}
|
|
}
|
|
|
|
extension GalleryItemViewController: UIGestureRecognizerDelegate {
|
|
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
|
|
if gestureRecognizer == singleTap {
|
|
let loc = gestureRecognizer.location(in: view)
|
|
return !topControlsView.frame.contains(loc) && !bottomControlsView.frame.contains(loc)
|
|
} else if gestureRecognizer == doubleTap {
|
|
let loc = gestureRecognizer.location(in: content.view)
|
|
return content.view.bounds.contains(loc)
|
|
} else {
|
|
return true
|
|
}
|
|
}
|
|
}
|