Add fullscreen image previewing and zooming

iOS/Article/ImageViewController.swift

@@ -0,0 +1,69 @@
+//
+//  ImageViewController.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 10/12/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class ImageViewController: UIViewController {
+
+	@IBOutlet weak var activityIndicatorView: UIActivityIndicatorView!
+	@IBOutlet weak var imageScrollView: ImageScrollView!
+	
+	private var dataTask: URLSessionDataTask? = nil
+	var url: URL!
+	
+	override func viewDidLoad() {
+        super.viewDidLoad()
+		
+		activityIndicatorView.isHidden = false
+		activityIndicatorView.startAnimating()
+		
+        imageScrollView.setup()
+        imageScrollView.imageScrollViewDelegate = self
+        imageScrollView.imageContentMode = .aspectFit
+        imageScrollView.initialOffset = .center
+		
+		dataTask = URLSession.shared.dataTask(with: url) { [weak self] data, response, error in
+			guard let self = self else { return }
+			if let data = data, let image = UIImage(data: data) {
+				
+				DispatchQueue.main.async {
+					self.activityIndicatorView.isHidden = true
+					self.activityIndicatorView.stopAnimating()
+					self.imageScrollView.display(image: image)
+				}
+				
+			}
+			
+		}
+		
+		dataTask!.resume()
+    }
+
+	@IBAction func done(_ sender: Any) {
+		dismiss(animated: true)
+	}
+	
+}
+
+// MARK: ImageScrollViewDelegate
+
+extension ImageViewController: ImageScrollViewDelegate {
+
+	func imageScrollViewDidChangeOrientation(imageScrollView: ImageScrollView) {
+	}
+	
+	func imageScrollViewDidGestureSwipeUp(imageScrollView: ImageScrollView) {
+		dismiss(animated: true)
+	}
+	
+	func imageScrollViewDidGestureSwipeDown(imageScrollView: ImageScrollView) {
+		dismiss(animated: true)
+	}
+	
+	
+}