Davide
469 lines
13 KiB
Swift
469 lines
13 KiB
Swift
import UIKit
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public protocol LightboxControllerPageDelegate: class {
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func lightboxController(_ controller: LightboxController, didMoveToPage page: Int)
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}
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public protocol LightboxControllerDismissalDelegate: class {
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func lightboxControllerWillDismiss(_ controller: LightboxController)
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}
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public protocol LightboxControllerTouchDelegate: class {
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func lightboxController(_ controller: LightboxController, didTouch image: LightboxImage, at index: Int)
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}
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open class LightboxController: UIViewController {
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// MARK: - Internal views
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lazy var scrollView: UIScrollView = { [unowned self] in
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let scrollView = UIScrollView()
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scrollView.isPagingEnabled = false
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scrollView.delegate = self
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scrollView.showsHorizontalScrollIndicator = false
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scrollView.decelerationRate = UIScrollView.DecelerationRate.fast
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return scrollView
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}()
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lazy var overlayTapGestureRecognizer: UITapGestureRecognizer = { [unowned self] in
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let gesture = UITapGestureRecognizer()
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gesture.addTarget(self, action: #selector(overlayViewDidTap(_:)))
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return gesture
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}()
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lazy var effectView: UIVisualEffectView = {
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let effect = UIBlurEffect(style: .dark)
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let view = UIVisualEffectView(effect: effect)
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view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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return view
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}()
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lazy var backgroundView: UIImageView = {
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let view = UIImageView()
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view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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return view
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}()
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// MARK: - Public views
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open fileprivate(set) lazy var headerView: HeaderView = { [unowned self] in
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let view = HeaderView()
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view.delegate = self
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return view
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}()
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open fileprivate(set) lazy var footerView: FooterView = { [unowned self] in
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let view = FooterView()
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view.delegate = self
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return view
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}()
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open fileprivate(set) lazy var overlayView: UIView = { [unowned self] in
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let view = UIView(frame: CGRect.zero)
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let gradient = CAGradientLayer()
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let colors = [UIColor(hex: "090909").withAlphaComponent(0), UIColor(hex: "040404")]
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view.addGradientLayer(colors)
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view.alpha = 0
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return view
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}()
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// MARK: - Properties
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open fileprivate(set) var currentPage = 0 {
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didSet {
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currentPage = min(numberOfPages - 1, max(0, currentPage))
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footerView.updatePage(currentPage + 1, numberOfPages)
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footerView.updateText(pageViews[currentPage].image.text)
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if currentPage == numberOfPages - 1 {
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seen = true
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}
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reconfigurePagesForPreload()
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pageDelegate?.lightboxController(self, didMoveToPage: currentPage)
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if let image = pageViews[currentPage].imageView.image, dynamicBackground {
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DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.125) {
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self.loadDynamicBackground(image)
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}
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}
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}
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}
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open var numberOfPages: Int {
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return pageViews.count
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}
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open var dynamicBackground: Bool = false {
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didSet {
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if dynamicBackground == true {
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effectView.frame = view.frame
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backgroundView.frame = effectView.frame
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view.insertSubview(effectView, at: 0)
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view.insertSubview(backgroundView, at: 0)
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} else {
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effectView.removeFromSuperview()
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backgroundView.removeFromSuperview()
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}
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}
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}
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open var spacing: CGFloat = 20 {
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didSet {
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configureLayout(view.bounds.size)
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}
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}
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open var images: [LightboxImage] {
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get {
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return pageViews.map { $0.image }
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}
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set(value) {
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initialImages = value
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configurePages(value)
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}
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}
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open weak var pageDelegate: LightboxControllerPageDelegate?
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open weak var dismissalDelegate: LightboxControllerDismissalDelegate?
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open weak var imageTouchDelegate: LightboxControllerTouchDelegate?
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open internal(set) var presented = false
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open fileprivate(set) var seen = false
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lazy var transitionManager: LightboxTransition = LightboxTransition()
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var pageViews = [PageView]()
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var statusBarHidden = false
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fileprivate var initialImages: [LightboxImage]
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fileprivate let initialPage: Int
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// MARK: - Initializers
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public init(images: [LightboxImage] = [], startIndex index: Int = 0) {
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self.initialImages = images
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self.initialPage = index
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super.init(nibName: nil, bundle: nil)
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}
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public required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: - View lifecycle
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open override func viewDidLoad() {
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super.viewDidLoad()
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// 9 July 2020: @3lvis
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// Lightbox hasn't been optimized to be used in presentation styles other than fullscreen.
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modalPresentationStyle = .fullScreen
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statusBarHidden = UIApplication.shared.isStatusBarHidden
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view.backgroundColor = UIColor.black
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transitionManager.lightboxController = self
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transitionManager.scrollView = scrollView
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transitioningDelegate = transitionManager
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[scrollView, overlayView, headerView, footerView].forEach { view.addSubview($0) }
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overlayView.addGestureRecognizer(overlayTapGestureRecognizer)
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configurePages(initialImages)
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goTo(initialPage, animated: false)
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}
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open override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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scrollView.frame = view.bounds
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footerView.frame.size = CGSize(
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width: view.bounds.width,
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height: 100
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)
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footerView.frame.origin = CGPoint(
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x: 0,
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y: view.bounds.height - footerView.frame.height
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)
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headerView.frame = CGRect(
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x: 0,
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y: 16,
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width: view.bounds.width,
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height: 100
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)
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if !presented {
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presented = true
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configureLayout(view.bounds.size)
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}
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}
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open override var prefersStatusBarHidden: Bool {
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return LightboxConfig.hideStatusBar
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}
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// MARK: - Rotation
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override open func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
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super.viewWillTransition(to: size, with: coordinator)
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coordinator.animate(alongsideTransition: { _ in
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self.configureLayout(size)
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}, completion: nil)
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}
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// MARK: - Configuration
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func configurePages(_ images: [LightboxImage]) {
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pageViews.forEach { $0.removeFromSuperview() }
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pageViews = []
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let preloadIndicies = calculatePreloadIndicies()
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for i in 0..<images.count {
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let pageView = PageView(image: preloadIndicies.contains(i) ? images[i] : LightboxImageStub())
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pageView.pageViewDelegate = self
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scrollView.addSubview(pageView)
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pageViews.append(pageView)
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}
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configureLayout(view.bounds.size)
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}
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func reconfigurePagesForPreload() {
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let preloadIndicies = calculatePreloadIndicies()
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for i in 0..<initialImages.count {
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let pageView = pageViews[i]
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if preloadIndicies.contains(i) {
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if type(of: pageView.image) == LightboxImageStub.self {
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pageView.update(with: initialImages[i])
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}
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} else {
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if type(of: pageView.image) != LightboxImageStub.self {
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pageView.update(with: LightboxImageStub())
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}
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}
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}
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}
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// MARK: - Pagination
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open func goTo(_ page: Int, animated: Bool = true) {
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guard page >= 0 && page < numberOfPages else {
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return
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}
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currentPage = page
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var offset = scrollView.contentOffset
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offset.x = CGFloat(page) * (scrollView.frame.width + spacing)
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let shouldAnimated = view.window != nil ? animated : false
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scrollView.setContentOffset(offset, animated: shouldAnimated)
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}
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open func next(_ animated: Bool = true) {
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goTo(currentPage + 1, animated: animated)
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}
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open func previous(_ animated: Bool = true) {
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goTo(currentPage - 1, animated: animated)
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}
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// MARK: - Actions
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@objc func overlayViewDidTap(_ tapGestureRecognizer: UITapGestureRecognizer) {
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footerView.expand(false)
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}
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// MARK: - Layout
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open func configureLayout(_ size: CGSize) {
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scrollView.frame.size = size
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scrollView.contentSize = CGSize(
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width: size.width * CGFloat(numberOfPages) + spacing * CGFloat(numberOfPages - 1),
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height: size.height)
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scrollView.contentOffset = CGPoint(x: CGFloat(currentPage) * (size.width + spacing), y: 0)
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for (index, pageView) in pageViews.enumerated() {
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var frame = scrollView.bounds
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frame.origin.x = (frame.width + spacing) * CGFloat(index)
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pageView.frame = frame
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pageView.configureLayout()
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if index != numberOfPages - 1 {
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pageView.frame.size.width += spacing
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}
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}
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[headerView, footerView].forEach { ($0 as AnyObject).configureLayout() }
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overlayView.frame = scrollView.frame
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overlayView.resizeGradientLayer()
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}
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fileprivate func loadDynamicBackground(_ image: UIImage) {
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backgroundView.image = image
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backgroundView.layer.add(CATransition(), forKey: "fade")
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}
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func toggleControls(pageView: PageView?, visible: Bool, duration: TimeInterval = 0.1, delay: TimeInterval = 0) {
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let alpha: CGFloat = visible ? 1.0 : 0.0
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pageView?.playButton.isHidden = !visible
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UIView.animate(withDuration: duration, delay: delay, options: [], animations: {
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self.headerView.alpha = alpha
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self.footerView.alpha = alpha
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pageView?.playButton.alpha = alpha
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}, completion: nil)
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}
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// MARK: - Helper functions
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func calculatePreloadIndicies () -> [Int] {
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var preloadIndicies: [Int] = []
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let preload = LightboxConfig.preload
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if preload > 0 {
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let lb = max(0, currentPage - preload)
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let rb = min(initialImages.count, currentPage + preload)
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for i in lb..<rb {
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preloadIndicies.append(i)
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}
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} else {
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preloadIndicies = [Int](0..<initialImages.count)
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}
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return preloadIndicies
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}
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}
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// MARK: - UIScrollViewDelegate
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extension LightboxController: UIScrollViewDelegate {
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public func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
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var speed: CGFloat = velocity.x < 0 ? -2 : 2
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if velocity.x == 0 {
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speed = 0
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}
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let pageWidth = scrollView.bounds.width + spacing
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var x = scrollView.contentOffset.x + speed * 60.0
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if speed > 0 {
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x = ceil(x / pageWidth) * pageWidth
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} else if speed < -0 {
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x = floor(x / pageWidth) * pageWidth
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} else {
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x = round(x / pageWidth) * pageWidth
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}
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targetContentOffset.pointee.x = x
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currentPage = Int(x / pageWidth)
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}
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}
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// MARK: - PageViewDelegate
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extension LightboxController: PageViewDelegate {
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func remoteImageDidLoad(_ image: UIImage?, imageView: UIImageView) {
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guard let image = image, dynamicBackground else {
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return
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}
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let imageViewFrame = imageView.convert(imageView.frame, to: view)
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guard view.frame.intersects(imageViewFrame) else {
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return
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}
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loadDynamicBackground(image)
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}
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func pageViewDidZoom(_ pageView: PageView) {
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let duration = pageView.hasZoomed ? 0.1 : 0.5
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toggleControls(pageView: pageView, visible: !pageView.hasZoomed, duration: duration, delay: 0.5)
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}
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func pageView(_ pageView: PageView, didTouchPlayButton videoURL: URL) {
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LightboxConfig.handleVideo(self, videoURL)
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}
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func pageViewDidTouch(_ pageView: PageView) {
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guard !pageView.hasZoomed else { return }
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imageTouchDelegate?.lightboxController(self, didTouch: images[currentPage], at: currentPage)
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let visible = (headerView.alpha == 1.0)
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toggleControls(pageView: pageView, visible: !visible)
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}
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}
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// MARK: - HeaderViewDelegate
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extension LightboxController: HeaderViewDelegate {
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func headerView(_ headerView: HeaderView, didPressDeleteButton deleteButton: UIButton) {
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deleteButton.isEnabled = false
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guard numberOfPages != 1 else {
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pageViews.removeAll()
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self.headerView(headerView, didPressCloseButton: headerView.closeButton)
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return
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}
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let prevIndex = currentPage
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if currentPage == numberOfPages - 1 {
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previous()
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} else {
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next()
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currentPage -= 1
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}
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self.initialImages.remove(at: prevIndex)
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self.pageViews.remove(at: prevIndex).removeFromSuperview()
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DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.5) {
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self.configureLayout(self.view.bounds.size)
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self.currentPage = Int(self.scrollView.contentOffset.x / self.view.bounds.width)
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deleteButton.isEnabled = true
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}
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}
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func headerView(_ headerView: HeaderView, didPressCloseButton closeButton: UIButton) {
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closeButton.isEnabled = false
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presented = false
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dismissalDelegate?.lightboxControllerWillDismiss(self)
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dismiss(animated: true, completion: nil)
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}
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}
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// MARK: - FooterViewDelegate
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extension LightboxController: FooterViewDelegate {
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public func footerView(_ footerView: FooterView, didExpand expanded: Bool) {
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UIView.animate(withDuration: 0.25, animations: {
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self.overlayView.alpha = expanded ? 1.0 : 0.0
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self.headerView.deleteButton.alpha = expanded ? 0.0 : 1.0
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})
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}
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}
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