created public interface to get/set torch levels

CardScan/Classes/ScanBaseViewController.swift

@@ -55,11 +55,28 @@ import Vision
     @objc open func showCardNumber(_ number: String, expiry: String?) { }
     @objc open func onCameraPermissionDenied(showedPrompt: Bool) { }
 
+    //MARK: -Torch Logic
     public func toggleTorch() {
         self.ocr.scanStats.torchOn = !self.ocr.scanStats.torchOn
         self.videoFeed.toggleTorch()
     }
 
+    public func isTorchOn() -> Bool{
+        return self.videoFeed.isTorchOn()
+    }
+
+    public func hasTorchAndIsAvailable() -> Bool {
+        return self.videoFeed.hasTorchAndIsAvailable()
+    }
+
+    public func setTorchLevel(level: Float) {
+        if 0.0...1.0 ~= level {
+            self.videoFeed.setTorchLevel(level: level)
+        } else {
+            print("Not a valid torch level")
+        }
+    }
+
     @objc static public func configure(apiKey: String? = nil) {
         if let apiKey = apiKey {
             Api.apiKey = apiKey
@@ -172,7 +189,7 @@ import Vision
         self.videoFeed.requestCameraAccess(permissionDelegate: self)
     }
 
-    public func setupOnViewDidLoad(regionOfInterestLabel: UILabel, blurView: BlurView, previewView: PreviewView, cornerView: CornerView, debugImageView: UIImageView?) {
+    public func setupOnViewDidLoad(regionOfInterestLabel: UILabel, blurView: BlurView, previewView: PreviewView, cornerView: CornerView, debugImageView: UIImageView?, torchLevel: Float?) {
 
         self.regionOfInterestLabel = regionOfInterestLabel
         self.blurView = blurView
@@ -196,7 +213,11 @@ import Vision
 
         self.videoFeed.pauseSession()
         //Apple example app sets up in viewDidLoad: https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/avcam_building_a_camera_app
-        self.videoFeed.setup(captureDelegate: self, completion: { success in })
+        self.videoFeed.setup(captureDelegate: self, completion: { success in
+            if let level = torchLevel {
+                self.setTorchLevel(level: level)
+            }
+        })
     }
 
     override open var shouldAutorotate: Bool {

CardScan/Classes/ScanViewController.swift

@@ -87,6 +87,7 @@ import UIKit
     public weak var scanDelegate: ScanDelegate?
     @objc public weak var stringDataSource: ScanStringsDataSource?
     @objc public var allowSkip = false
+    public var torchLevel: Float? 
     public var scanQrCode = false
     @objc public var hideBackButtonImage = false
     @IBOutlet weak var backButtonImageToTextConstraint: NSLayoutConstraint!
@@ -272,7 +273,7 @@ import UIKit
         }
 
         let debugImageView = self.showDebugImageView ? self.debugImageView : nil
-        self.setupOnViewDidLoad(regionOfInterestLabel: self.regionOfInterestLabel, blurView: self.blurView, previewView: self.previewView, cornerView: self.cornerView, debugImageView: debugImageView)
+        self.setupOnViewDidLoad(regionOfInterestLabel: self.regionOfInterestLabel, blurView: self.blurView, previewView: self.previewView, cornerView: self.cornerView, debugImageView: debugImageView, torchLevel: self.torchLevel)
         self.startCameraPreview()
     }
 

CardScan/Classes/Torch.swift

@@ -9,6 +9,7 @@ struct Torch {
     let device: AVCaptureDevice?
     var state: State
     var lastStateChange: Date
+    var level: Float
 
     init(device: AVCaptureDevice) {
         self.state = .off
@@ -19,15 +20,15 @@ struct Torch {
         } else {
             self.device = nil
         }
+        self.level = 1.0
     }
 
     mutating func toggle() {
         self.state = self.state == .on ? .off : .on
-
         do {
             try self.device?.lockForConfiguration()
             if self.state == .on {
-                do { try self.device?.setTorchModeOn(level: 0.5) } catch { print("could not set torch mode on") }
+                do { try self.device?.setTorchModeOn(level: self.level) } catch { print("could not set torch mode on") }
             } else {
                 self.device?.torchMode = .off
             }
@@ -37,34 +38,4 @@ struct Torch {
         }
     }
 
-    mutating func luma(_ value: Double) {
-        let duration: Double = self.lastStateChange.timeIntervalSinceNow * -1.0
-        var newState = self.state
-        switch (self.state, value, duration) {
-        case (.off, ..<0.4, 3.0...):
-            newState = .on
-        case (.on, _, 20.0...):
-            newState = .off
-        default:
-            newState = self.state
-        }
-
-        if self.state != newState {
-            self.lastStateChange = Date()
-            self.state = newState
-
-            do {
-                try self.device?.lockForConfiguration()
-                if self.state == .on {
-                    do { try self.device?.setTorchModeOn(level: 0.005) } catch { print("could not set torch mode on") }
-                } else {
-                    self.device?.torchMode = .off
-                }
-                self.device?.unlockForConfiguration()
-            } catch {
-                print("error setting torch level")
-            }
-        }
-    }
-
 }

CardScan/Classes/VideoFeed.swift

@@ -176,10 +176,26 @@ class VideoFeed {
         videoDevice.unlockForConfiguration()
     }
 
+    //MARK: -Torch Logic
     func toggleTorch() {
         self.torch?.toggle()
     }
 
+    func isTorchOn() -> Bool {
+        return self.torch?.state == Torch.State.on 
+    }
+
+    func hasTorchAndIsAvailable() -> Bool {
+        let hasTorch = self.torch?.device?.hasTorch ?? false
+        let isTorchAvailable = self.torch?.device?.isTorchAvailable ?? false
+        return hasTorch && isTorchAvailable
+    }
+
+    func setTorchLevel(level: Float) {
+        self.torch?.level = level
+    }
+
+    //MARK: -VC Lifecycle Logic
     func willAppear() {
         sessionQueue.async {
             switch self.setupResult {