mirror of
https://github.com/Ranchero-Software/NetNewsWire
synced 2025-08-12 06:26:36 +00:00
Add fullscreen image previewing and zooming
This commit is contained in:
Maurice Parker
@@ -21,6 +21,10 @@ enum ArticleViewState: Equatable {
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}
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class ArticleViewController: UIViewController {
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private struct MessageName {
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static let imageWasClicked = "imageWasClicked"
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}
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@IBOutlet private weak var nextUnreadBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var prevArticleBarButtonItem: UIBarButtonItem!
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@@ -102,7 +106,10 @@ class ArticleViewController: UIViewController {
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self.webViewContainer.addChildAndPin(webView)
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webView.navigationDelegate = self
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webView.uiDelegate = self
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webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasClicked)
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webView.configuration.userContentController.add(self, name: MessageName.imageWasClicked)
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// Even though page.html should be loaded into this webview, we have to do it again
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// to work around this bug: http://www.openradar.me/22855188
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webView.loadHTMLString(ArticleRenderer.page.html, baseURL: ArticleRenderer.page.baseURL)
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@@ -337,6 +344,20 @@ extension ArticleViewController: WKUIDelegate {
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}
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}
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// MARK: WKScriptMessageHandler
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extension ArticleViewController: WKScriptMessageHandler {
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func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
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if message.name == MessageName.imageWasClicked, let link = message.body as? String, let url = URL(string: link) {
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let imageVC = UIStoryboard.main.instantiateController(ofType: ImageViewController.self)
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imageVC.url = url
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imageVC.modalPresentationStyle = .fullScreen
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present(imageVC, animated: true)
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}
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}
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}
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// MARK: Private
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private extension ArticleViewController {
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372
iOS/Article/ImageScrollView.swift
Normal file
372
iOS/Article/ImageScrollView.swift
Normal file
@@ -0,0 +1,372 @@
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//
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// ImageScrollView.swift
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// Beauty
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//
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// Created by Nguyen Cong Huy on 1/19/16.
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// Copyright © 2016 Nguyen Cong Huy. All rights reserved.
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//
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import UIKit
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@objc public protocol ImageScrollViewDelegate: UIScrollViewDelegate {
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func imageScrollViewDidChangeOrientation(imageScrollView: ImageScrollView)
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func imageScrollViewDidGestureSwipeUp(imageScrollView: ImageScrollView)
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func imageScrollViewDidGestureSwipeDown(imageScrollView: ImageScrollView)
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}
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open class ImageScrollView: UIScrollView {
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@objc public enum ScaleMode: Int {
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case aspectFill
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case aspectFit
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case widthFill
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case heightFill
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}
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@objc public enum Offset: Int {
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case begining
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case center
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}
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static let kZoomInFactorFromMinWhenDoubleTap: CGFloat = 2
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@objc open var imageContentMode: ScaleMode = .widthFill
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@objc open var initialOffset: Offset = .begining
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@objc public private(set) var zoomView: UIImageView? = nil
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@objc open weak var imageScrollViewDelegate: ImageScrollViewDelegate?
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var imageSize: CGSize = CGSize.zero
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private var pointToCenterAfterResize: CGPoint = CGPoint.zero
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private var scaleToRestoreAfterResize: CGFloat = 1.0
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var maxScaleFromMinScale: CGFloat = 3.0
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override open var frame: CGRect {
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willSet {
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if frame.equalTo(newValue) == false && newValue.equalTo(CGRect.zero) == false && imageSize.equalTo(CGSize.zero) == false {
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prepareToResize()
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}
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}
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didSet {
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if frame.equalTo(oldValue) == false && frame.equalTo(CGRect.zero) == false && imageSize.equalTo(CGSize.zero) == false {
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recoverFromResizing()
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}
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}
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}
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override public init(frame: CGRect) {
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super.init(frame: frame)
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initialize()
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}
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required public init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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initialize()
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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private func initialize() {
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showsVerticalScrollIndicator = false
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showsHorizontalScrollIndicator = false
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bouncesZoom = true
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decelerationRate = UIScrollView.DecelerationRate.fast
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delegate = self
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NotificationCenter.default.addObserver(self, selector: #selector(ImageScrollView.changeOrientationNotification), name: UIDevice.orientationDidChangeNotification, object: nil)
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}
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@objc public func adjustFrameToCenter() {
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guard let unwrappedZoomView = zoomView else {
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return
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}
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var frameToCenter = unwrappedZoomView.frame
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// center horizontally
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if frameToCenter.size.width < bounds.width {
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frameToCenter.origin.x = (bounds.width - frameToCenter.size.width) / 2
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}
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else {
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frameToCenter.origin.x = 0
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}
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// center vertically
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if frameToCenter.size.height < bounds.height {
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frameToCenter.origin.y = (bounds.height - frameToCenter.size.height) / 2
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}
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else {
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frameToCenter.origin.y = 0
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}
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unwrappedZoomView.frame = frameToCenter
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}
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private func prepareToResize() {
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let boundsCenter = CGPoint(x: bounds.midX, y: bounds.midY)
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pointToCenterAfterResize = convert(boundsCenter, to: zoomView)
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scaleToRestoreAfterResize = zoomScale
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// If we're at the minimum zoom scale, preserve that by returning 0, which will be converted to the minimum
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// allowable scale when the scale is restored.
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if scaleToRestoreAfterResize <= minimumZoomScale + CGFloat(Float.ulpOfOne) {
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scaleToRestoreAfterResize = 0
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}
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}
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private func recoverFromResizing() {
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setMaxMinZoomScalesForCurrentBounds()
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// restore zoom scale, first making sure it is within the allowable range.
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let maxZoomScale = max(minimumZoomScale, scaleToRestoreAfterResize)
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zoomScale = min(maximumZoomScale, maxZoomScale)
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// restore center point, first making sure it is within the allowable range.
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// convert our desired center point back to our own coordinate space
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let boundsCenter = convert(pointToCenterAfterResize, to: zoomView)
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// calculate the content offset that would yield that center point
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var offset = CGPoint(x: boundsCenter.x - bounds.size.width/2.0, y: boundsCenter.y - bounds.size.height/2.0)
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// restore offset, adjusted to be within the allowable range
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let maxOffset = maximumContentOffset()
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let minOffset = minimumContentOffset()
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var realMaxOffset = min(maxOffset.x, offset.x)
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offset.x = max(minOffset.x, realMaxOffset)
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realMaxOffset = min(maxOffset.y, offset.y)
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offset.y = max(minOffset.y, realMaxOffset)
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contentOffset = offset
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}
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private func maximumContentOffset() -> CGPoint {
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return CGPoint(x: contentSize.width - bounds.width,y:contentSize.height - bounds.height)
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}
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private func minimumContentOffset() -> CGPoint {
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return CGPoint.zero
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}
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// MARK: - Set up
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open func setup() {
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var topSupperView = superview
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while topSupperView?.superview != nil {
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topSupperView = topSupperView?.superview
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}
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// Make sure views have already layout with precise frame
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topSupperView?.layoutIfNeeded()
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}
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// MARK: - Display image
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@objc open func display(image: UIImage) {
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if let zoomView = zoomView {
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zoomView.removeFromSuperview()
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}
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zoomView = UIImageView(image: image)
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zoomView!.isUserInteractionEnabled = true
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addSubview(zoomView!)
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let tapGesture = UITapGestureRecognizer(target: self, action: #selector(doubleTapGestureRecognizer(_:)))
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tapGesture.numberOfTapsRequired = 2
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zoomView!.addGestureRecognizer(tapGesture)
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let downSwipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(swipeUpGestureRecognizer(_:)))
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downSwipeGesture.direction = .down
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zoomView!.addGestureRecognizer(downSwipeGesture)
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let upSwipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(swipeDownGestureRecognizer(_:)))
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upSwipeGesture.direction = .up
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zoomView!.addGestureRecognizer(upSwipeGesture)
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configureImageForSize(image.size)
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}
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private func configureImageForSize(_ size: CGSize) {
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imageSize = size
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contentSize = imageSize
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setMaxMinZoomScalesForCurrentBounds()
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zoomScale = minimumZoomScale
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switch initialOffset {
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case .begining:
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contentOffset = CGPoint.zero
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case .center:
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let xOffset = contentSize.width < bounds.width ? 0 : (contentSize.width - bounds.width)/2
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let yOffset = contentSize.height < bounds.height ? 0 : (contentSize.height - bounds.height)/2
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switch imageContentMode {
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case .aspectFit:
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contentOffset = CGPoint.zero
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case .aspectFill:
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contentOffset = CGPoint(x: xOffset, y: yOffset)
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case .heightFill:
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contentOffset = CGPoint(x: xOffset, y: 0)
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case .widthFill:
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contentOffset = CGPoint(x: 0, y: yOffset)
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}
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}
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}
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private func setMaxMinZoomScalesForCurrentBounds() {
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// calculate min/max zoomscale
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let xScale = bounds.width / imageSize.width // the scale needed to perfectly fit the image width-wise
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let yScale = bounds.height / imageSize.height // the scale needed to perfectly fit the image height-wise
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var minScale: CGFloat = 1
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switch imageContentMode {
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case .aspectFill:
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minScale = max(xScale, yScale)
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case .aspectFit:
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minScale = min(xScale, yScale)
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case .widthFill:
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minScale = xScale
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case .heightFill:
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minScale = yScale
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}
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let maxScale = maxScaleFromMinScale*minScale
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// don't let minScale exceed maxScale. (If the image is smaller than the screen, we don't want to force it to be zoomed.)
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if minScale > maxScale {
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minScale = maxScale
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}
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maximumZoomScale = maxScale
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minimumZoomScale = minScale * 0.999 // the multiply factor to prevent user cannot scroll page while they use this control in UIPageViewController
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}
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// MARK: - Gesture
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@objc func doubleTapGestureRecognizer(_ gestureRecognizer: UIGestureRecognizer) {
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// zoom out if it bigger than middle scale point. Else, zoom in
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if zoomScale >= maximumZoomScale / 2.0 {
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setZoomScale(minimumZoomScale, animated: true)
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}
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else {
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let center = gestureRecognizer.location(in: gestureRecognizer.view)
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let zoomRect = zoomRectForScale(ImageScrollView.kZoomInFactorFromMinWhenDoubleTap * minimumZoomScale, center: center)
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zoom(to: zoomRect, animated: true)
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}
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}
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@objc func swipeUpGestureRecognizer(_ gestureRecognizer: UIGestureRecognizer) {
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if gestureRecognizer.state == .ended {
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imageScrollViewDelegate?.imageScrollViewDidGestureSwipeUp(imageScrollView: self)
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}
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}
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@objc func swipeDownGestureRecognizer(_ gestureRecognizer: UIGestureRecognizer) {
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if gestureRecognizer.state == .ended {
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imageScrollViewDelegate?.imageScrollViewDidGestureSwipeDown(imageScrollView: self)
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}
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}
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private func zoomRectForScale(_ scale: CGFloat, center: CGPoint) -> CGRect {
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var zoomRect = CGRect.zero
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// the zoom rect is in the content view's coordinates.
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// at a zoom scale of 1.0, it would be the size of the imageScrollView's bounds.
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// as the zoom scale decreases, so more content is visible, the size of the rect grows.
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zoomRect.size.height = frame.size.height / scale
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zoomRect.size.width = frame.size.width / scale
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// choose an origin so as to get the right center.
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zoomRect.origin.x = center.x - (zoomRect.size.width / 2.0)
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zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0)
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return zoomRect
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}
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open func refresh() {
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if let image = zoomView?.image {
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display(image: image)
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}
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}
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// MARK: - Actions
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@objc func changeOrientationNotification() {
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// A weird bug that frames are not update right after orientation changed. Need delay a little bit with async.
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DispatchQueue.main.async {
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self.configureImageForSize(self.imageSize)
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self.imageScrollViewDelegate?.imageScrollViewDidChangeOrientation(imageScrollView: self)
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}
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}
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}
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extension ImageScrollView: UIScrollViewDelegate {
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public func scrollViewDidScroll(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewDidScroll?(scrollView)
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}
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public func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewWillBeginDragging?(scrollView)
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}
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public func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
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imageScrollViewDelegate?.scrollViewWillEndDragging?(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
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}
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public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
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imageScrollViewDelegate?.scrollViewDidEndDragging?(scrollView, willDecelerate: decelerate)
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}
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public func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewWillBeginDecelerating?(scrollView)
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}
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public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewDidEndDecelerating?(scrollView)
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}
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public func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewDidEndScrollingAnimation?(scrollView)
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}
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public func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
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imageScrollViewDelegate?.scrollViewWillBeginZooming?(scrollView, with: view)
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}
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public func scrollViewDidEndZooming(_ scrollView: UIScrollView, with view: UIView?, atScale scale: CGFloat) {
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imageScrollViewDelegate?.scrollViewDidEndZooming?(scrollView, with: view, atScale: scale)
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}
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public func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
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return false
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}
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@available(iOS 11.0, *)
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public func scrollViewDidChangeAdjustedContentInset(_ scrollView: UIScrollView) {
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imageScrollViewDelegate?.scrollViewDidChangeAdjustedContentInset?(scrollView)
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}
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public func viewForZooming(in scrollView: UIScrollView) -> UIView? {
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return zoomView
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}
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public func scrollViewDidZoom(_ scrollView: UIScrollView) {
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adjustFrameToCenter()
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imageScrollViewDelegate?.scrollViewDidZoom?(scrollView)
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}
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}
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69
iOS/Article/ImageViewController.swift
Normal file
69
iOS/Article/ImageViewController.swift
Normal file
@@ -0,0 +1,69 @@
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//
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// ImageViewController.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 10/12/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
|
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//
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import UIKit
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class ImageViewController: UIViewController {
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@IBOutlet weak var activityIndicatorView: UIActivityIndicatorView!
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@IBOutlet weak var imageScrollView: ImageScrollView!
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private var dataTask: URLSessionDataTask? = nil
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var url: URL!
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override func viewDidLoad() {
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super.viewDidLoad()
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activityIndicatorView.isHidden = false
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activityIndicatorView.startAnimating()
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imageScrollView.setup()
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imageScrollView.imageScrollViewDelegate = self
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imageScrollView.imageContentMode = .aspectFit
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imageScrollView.initialOffset = .center
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dataTask = URLSession.shared.dataTask(with: url) { [weak self] data, response, error in
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guard let self = self else { return }
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if let data = data, let image = UIImage(data: data) {
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DispatchQueue.main.async {
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self.activityIndicatorView.isHidden = true
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self.activityIndicatorView.stopAnimating()
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self.imageScrollView.display(image: image)
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}
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}
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}
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dataTask!.resume()
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}
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@IBAction func done(_ sender: Any) {
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dismiss(animated: true)
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}
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}
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// MARK: ImageScrollViewDelegate
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extension ImageViewController: ImageScrollViewDelegate {
|
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func imageScrollViewDidChangeOrientation(imageScrollView: ImageScrollView) {
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}
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func imageScrollViewDidGestureSwipeUp(imageScrollView: ImageScrollView) {
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dismiss(animated: true)
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}
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func imageScrollViewDidGestureSwipeDown(imageScrollView: ImageScrollView) {
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dismiss(animated: true)
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}
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}
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@@ -1,8 +1,9 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15400" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
|
||||
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15504" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
|
||||
<device id="retina6_1" orientation="portrait" appearance="light"/>
|
||||
<dependencies>
|
||||
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15404"/>
|
||||
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15508"/>
|
||||
<capability name="Named colors" minToolsVersion="9.0"/>
|
||||
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
|
||||
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
|
||||
</dependencies>
|
||||
@@ -226,6 +227,61 @@
|
||||
</objects>
|
||||
<point key="canvasLocation" x="900" y="-759"/>
|
||||
</scene>
|
||||
<!--Image View Controller-->
|
||||
<scene sceneID="TT4-oA-DBw">
|
||||
<objects>
|
||||
<viewController storyboardIdentifier="ImageViewController" id="vO9-a3-Dnu" customClass="ImageViewController" customModule="NetNewsWire" customModuleProvider="target" sceneMemberID="viewController">
|
||||
<view key="view" contentMode="scaleToFill" id="w6Q-vH-063">
|
||||
<rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
|
||||
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
|
||||
<subviews>
|
||||
<scrollView verifyAmbiguity="off" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" ambiguous="YES" translatesAutoresizingMaskIntoConstraints="NO" id="msG-pz-EKk" customClass="ImageScrollView" customModule="NetNewsWire" customModuleProvider="target">
|
||||
<rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
|
||||
<subviews>
|
||||
<activityIndicatorView opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" style="large" translatesAutoresizingMaskIntoConstraints="NO" id="iEh-n3-Vkg">
|
||||
<rect key="frame" x="188.5" y="390.5" width="37" height="37"/>
|
||||
</activityIndicatorView>
|
||||
</subviews>
|
||||
<constraints>
|
||||
<constraint firstItem="iEh-n3-Vkg" firstAttribute="centerX" secondItem="msG-pz-EKk" secondAttribute="centerX" id="FSP-DY-Vax"/>
|
||||
<constraint firstItem="iEh-n3-Vkg" firstAttribute="centerY" secondItem="msG-pz-EKk" secondAttribute="centerY" id="rev-zC-wMY"/>
|
||||
</constraints>
|
||||
<viewLayoutGuide key="contentLayoutGuide" id="phv-DN-krZ"/>
|
||||
<viewLayoutGuide key="frameLayoutGuide" id="NNU-C8-Fsz"/>
|
||||
</scrollView>
|
||||
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="cXR-ll-xBx">
|
||||
<rect key="frame" x="0.0" y="44" width="44" height="44"/>
|
||||
<constraints>
|
||||
<constraint firstAttribute="height" constant="44" id="6kc-Gw-KbZ"/>
|
||||
<constraint firstAttribute="width" constant="44" id="cBq-gs-WzN"/>
|
||||
</constraints>
|
||||
<color key="tintColor" name="primaryAccentColor"/>
|
||||
<state key="normal" image="multiply.circle.fill" catalog="system"/>
|
||||
<connections>
|
||||
<action selector="done:" destination="vO9-a3-Dnu" eventType="touchUpInside" id="tgd-ov-4Ft"/>
|
||||
</connections>
|
||||
</button>
|
||||
</subviews>
|
||||
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
|
||||
<constraints>
|
||||
<constraint firstItem="mbY-02-GFL" firstAttribute="bottom" secondItem="msG-pz-EKk" secondAttribute="bottom" id="AtA-bA-jDr"/>
|
||||
<constraint firstItem="mbY-02-GFL" firstAttribute="trailing" secondItem="msG-pz-EKk" secondAttribute="trailing" id="R49-qV-8nm"/>
|
||||
<constraint firstItem="msG-pz-EKk" firstAttribute="leading" secondItem="mbY-02-GFL" secondAttribute="leading" id="XN1-xN-hYS"/>
|
||||
<constraint firstItem="msG-pz-EKk" firstAttribute="top" secondItem="mbY-02-GFL" secondAttribute="top" id="p1a-s0-wdK"/>
|
||||
<constraint firstItem="cXR-ll-xBx" firstAttribute="leading" secondItem="mbY-02-GFL" secondAttribute="leading" id="vJs-LN-Ydd"/>
|
||||
<constraint firstItem="cXR-ll-xBx" firstAttribute="top" secondItem="mbY-02-GFL" secondAttribute="top" id="xVN-Qt-WYA"/>
|
||||
</constraints>
|
||||
<viewLayoutGuide key="safeArea" id="mbY-02-GFL"/>
|
||||
</view>
|
||||
<connections>
|
||||
<outlet property="activityIndicatorView" destination="iEh-n3-Vkg" id="xue-X1-awS"/>
|
||||
<outlet property="imageScrollView" destination="msG-pz-EKk" id="dGi-M6-dcO"/>
|
||||
</connections>
|
||||
</viewController>
|
||||
<placeholder placeholderIdentifier="IBFirstResponder" id="ZPN-tH-JAG" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
|
||||
</objects>
|
||||
<point key="canvasLocation" x="3056.521739130435" y="-759.375"/>
|
||||
</scene>
|
||||
</scenes>
|
||||
<resources>
|
||||
<image name="chevron.down" catalog="system" width="64" height="36"/>
|
||||
@@ -233,8 +289,12 @@
|
||||
<image name="chevron.up" catalog="system" width="64" height="36"/>
|
||||
<image name="circle" catalog="system" width="64" height="60"/>
|
||||
<image name="gear" catalog="system" width="64" height="58"/>
|
||||
<image name="multiply.circle.fill" catalog="system" width="64" height="60"/>
|
||||
<image name="safari" catalog="system" width="64" height="60"/>
|
||||
<image name="square.and.arrow.up" catalog="system" width="56" height="64"/>
|
||||
<image name="star" catalog="system" width="64" height="58"/>
|
||||
<namedColor name="primaryAccentColor">
|
||||
<color red="0.031372549019607843" green="0.41568627450980394" blue="0.93333333333333335" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
|
||||
</namedColor>
|
||||
</resources>
|
||||
</document>
|
||||
|
||||
Reference in New Issue
Block a user