Implement iOS Camera & Image Preview Application

IDNowTest.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

IDNowTest.xcodeproj/xcuserdata/kristianrusyn.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

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+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   uuid = "94B469D6-F9EE-46E7-8AC4-2287DF97F088"
+   type = "1"
+   version = "2.0">
+</Bucket>

IDNowTest.xcodeproj/xcuserdata/kristianrusyn.xcuserdatad/xcschemes/xcschememanagement.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>IDNowTest.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>

IDNowTest/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  IDNowTest
+//
+//  Created by Kristian Rusyn on 22/09/2024.
+//
+
+import UIKit
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+    func application(_ application: UIApplication,
+                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication,
+                     configurationForConnecting connectingSceneSession: UISceneSession,
+                     options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+

IDNowTest/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

IDNowTest/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

IDNowTest/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

IDNowTest/Base.lproj/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

IDNowTest/Base.lproj/Main.storyboard

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+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="23094" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina6_12" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="23084"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Camera View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="CameraViewController" customModule="IDNowTest" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="captureButtonID">
+                                <rect key="frame" x="159" y="776" width="75" height="32"/>
+                                <color key="backgroundColor" systemColor="systemBlueColor"/>
+                                <inset key="contentEdgeInsets" minX="5" minY="5" maxX="5" maxY="5"/>
+                                <state key="normal" title="Capture"/>
+                                <userDefinedRuntimeAttributes>
+                                    <userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
+                                        <integer key="value" value="4"/>
+                                    </userDefinedRuntimeAttribute>
+                                </userDefinedRuntimeAttributes>
+                                <connections>
+                                    <action selector="captureButtonPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="hDM-oR-XIP"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                        <constraints>
+                            <constraint firstItem="captureButtonID" firstAttribute="centerX" secondItem="6Tk-OE-BBY" secondAttribute="centerX" id="MHP-Ni-HXw"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="captureButtonID" secondAttribute="bottom" constant="10" id="biS-Ew-hAh"/>
+                        </constraints>
+                        <userDefinedRuntimeAttributes>
+                            <userDefinedRuntimeAttribute type="boolean" keyPath="keyPath" value="YES"/>
+                        </userDefinedRuntimeAttributes>
+                    </view>
+                    <connections>
+                        <outlet property="captureButton" destination="captureButtonID" id="DZJ-Gn-NNu"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-106" y="4"/>
+        </scene>
+    </scenes>
+    <resources>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+        <systemColor name="systemBlueColor">
+            <color red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+    </resources>
+</document>

IDNowTest/CameraViewController/CameraViewController.swift

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+//
+//  ViewController.swift
+//  IDNowTest
+//
+//  Created by Kristian Rusyn on 22/09/2024.
+//
+
+import UIKit
+import AVFoundation
+
+class CameraViewController: UIViewController {
+
+    private let cameraService = CameraServiceImpl()
+
+    @IBOutlet weak var captureButton: UIButton!
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        try! cameraService.setupCameraStream(view: view)
+    }
+
+    @objc func capturePhoto() {
+        captureButton.isEnabled = false
+        cameraService.capturePhoto(imageClosure: { [weak self] image, error  in
+            self?.captureButton.isEnabled = true
+            if let error {
+                let alert = UIAlertController(title: "Error",
+                                              message: error.localizedDescription,
+                                              preferredStyle: .alert)
+                self?.present(alert, animated: true)
+            } else if let image {
+                self?.openImageViewController(image: image)
+            }
+
+        })
+    }
+
+    private func openImageViewController(image: UIImage) {
+        let imageViewController = ImageViewController(viewModel: ImageViewModel(image: image))
+        present(UINavigationController(rootViewController: imageViewController), animated: true)
+    }
+}

IDNowTest/ImageViewController/ImageViewController.swift

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+//
+//  ImageViewController.swift
+//  IDNowTest
+//
+//  Created by Kristian Rusyn on 22/09/2024.
+//
+
+import Combine
+import UIKit
+import Photos
+
+class ImageViewController: UIViewController {
+    @IBOutlet private weak var titleLabel: UILabel!
+    @IBOutlet private weak var descriptionLabel: UILabel!
+    @IBOutlet private weak var priceLabel: UILabel!
+
+    @IBOutlet private weak var imageView: UIImageView!
+    @IBOutlet private weak var activityIndicator: UIActivityIndicatorView!
+
+    private var viewModel: ImageViewModel
+
+    private var cancellables = Set<AnyCancellable>()
+
+    init(viewModel: ImageViewModel) {
+        self.viewModel = viewModel
+        super.init(nibName: String(describing: ImageViewController.self), bundle: nil)
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        setupNavigationBar()
+        setupBindings()
+        imageView.image = viewModel.image
+        viewModel.fetchProduct()
+
+        // Hide the activity indicator initially
+        activityIndicator.hidesWhenStopped = true
+        activityIndicator.stopAnimating()
+    }
+
+    private func setupNavigationBar() {
+        let downloadButton = UIBarButtonItem(title: "Download",
+                                             style: .plain,
+                                             target: self,
+                                             action: #selector(downloadImage))
+        navigationItem.rightBarButtonItem = downloadButton
+    }
+
+    private func setupBindings() {
+        viewModel.$isLoading
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isLoading in
+                if isLoading {
+                    self?.activityIndicator.startAnimating()
+                } else {
+                    self?.activityIndicator.stopAnimating()
+                }
+            }
+            .store(in: &cancellables)
+
+        viewModel.$title
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] title in
+                self?.titleLabel.text = title
+                self?.navigationItem.title = title
+            }
+            .store(in: &cancellables)
+
+        viewModel.$description
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] description in
+                self?.descriptionLabel.text = description
+            }
+            .store(in: &cancellables)
+
+        viewModel.$price
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] price in
+                self?.priceLabel.text = price
+            }
+            .store(in: &cancellables)
+
+        viewModel.$image
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] image in
+                self?.imageView.image = image
+            }
+            .store(in: &cancellables)
+
+        viewModel.$errorMessage
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] errorMessage in
+                if let message = errorMessage {
+                    let alert = UIAlertController(title: "Error", message: message, preferredStyle: .alert)
+                    alert.addAction(UIAlertAction(title: "OK", style: .default))
+                    self?.present(alert, animated: true, completion: nil)
+                }
+            }
+            .store(in: &cancellables)
+    }
+
+    @objc private func downloadImage() {
+        PHPhotoLibrary.requestAuthorization { [weak self] status in
+            DispatchQueue.main.async {
+                switch status {
+                case .authorized, .limited:
+                    self?.saveImageToPhotoLibrary()
+                case .denied, .restricted:
+                    let alert = UIAlertController(title: "Access Denied",
+                                                  message: "Please allow photo library access in Settings to save images.",
+                                                  preferredStyle: .alert)
+                    alert.addAction(UIAlertAction(title: "OK", style: .default))
+                    self?.present(alert, animated: true, completion: nil)
+                case .notDetermined:
+                    break
+                @unknown default:
+                    let alert = UIAlertController(title: "Unknown Error",
+                                                  message: "An unknown error occurred while accessing the photo library.",
+                                                  preferredStyle: .alert)
+                    alert.addAction(UIAlertAction(title: "OK", style: .default))
+                    self?.present(alert, animated: true, completion: nil)
+                }
+            }
+        }
+    }
+
+    private func saveImageToPhotoLibrary() {
+        guard let image = viewModel.image else { return }
+        UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
+    }
+
+    @objc private func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
+        var alert: UIAlertController
+        if let error = error {
+            alert = UIAlertController(title: "Save Error",
+                                          message: error.localizedDescription,
+                                          preferredStyle: .alert)
+            alert.addAction(UIAlertAction(title: "OK", style: .default))
+        } else {
+            alert = UIAlertController(title: "Saved",
+                                          message: "Image has been saved to your photos.",
+                                          preferredStyle: .alert)
+            alert.addAction(UIAlertAction(title: "OK", style: .default))
+        }
+
+        present(alert, animated: true, completion: nil)
+    }
+}