Fix swiftlint warnings

.swiftlint.yml

@@ -16,7 +16,6 @@ excluded:
 - Carthage
 - Pods
 - SwiftLint/Common/3rdPartyLib
-force_cast: warning
 line_length:
     warning: 250
     error: 300

Vocable/AppDelegate.swift

@@ -19,7 +19,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         get {
             gazeableWindow
         }
-        //swiftlint:disable unused_setter_value
+        // swiftlint:disable unused_setter_value
         set {
 
         }

Vocable/Common/ToastContainerViewController.swift

@@ -36,7 +36,7 @@ class ToastContainerViewController: UIViewController {
         }
     }
 
-    //In the future we should get away from manipulating the window here.
+    // In the future we should get away from manipulating the window here.
     func handlePhraseSaved(toastLabelText: String) {
         if phraseSavedView == nil {
             let phraseSavedView = UINib(nibName: "ToastView", bundle: .main).instantiate(withOwner: nil, options: nil).first as! ToastView

Vocable/Extensions/Array+Split.swift

@@ -23,7 +23,7 @@ extension Collection {
         return indices.contains(index) ? self[index] : nil
     }
 
-    func dropNils<T>() -> [T] where Element == Optional<T> {
+    func dropNils<T>() -> [T] where Element == T? {
         return self.compactMap({$0})
     }
 }

Vocable/Extensions/VectorUtils.swift

@@ -91,7 +91,7 @@ extension SCNVector3 {
     }
 
     func angleToReach(_ vectorB: SCNVector3) -> SCNFloat {
-        //cos(angle) = (A.B)/(|A||B|)
+        // cos(angle) = (A.B)/(|A||B|)
         let cosineAngle = (dot(vector: vectorB) / (magnitude * vectorB.magnitude))
         return SCNFloat(acos(cosineAngle))
     }

Vocable/Features/Settings/EditCategories/EditCategoriesViewController.swift

@@ -231,7 +231,7 @@ final class EditCategoriesViewController: PagingCarouselViewController, NSFetche
             return .none
         }
 
-        //Check if the cell below the current one is hidden, disable down button if needed.
+        // Check if the cell below the current one is hidden, disable down button if needed.
         if indexPath.row + 1 < fetchResultsController.fetchedObjects?.count ?? 0 {
             let nextIndex = IndexPath(row: indexPath.row + 1, section: indexPath.section)
             if fetchResultsController.object(at: nextIndex).isHidden {

Vocable/Features/Voice/ListeningResponseViewController.swift

@@ -86,9 +86,6 @@ final class ListeningResponseViewController: VocableViewController {
     private let synthesizedSpeechQueue = DispatchQueue(label: "speech_synthesis_queue", qos: .userInitiated)
     let classifier = VLClassifier()
 
-    private let feelingsResponses = ["Okay", "Good", "Bad"]
-    private let prefixes = ["Would you like", "Do you want"]
-
     @PublishedValue private(set) var lastUtterance: String?
 
     private var content: Content = .empty(.listeningResponse)

Vocable/HeadTracking/HeadGazeTrackingInterpolator.swift

@@ -181,7 +181,7 @@ class HeadGazeTrackingInterpolator {
         let scale = getFaceScale()
         let mtx = getFaceTransformationMatrix()
         var (c0, c1, c2, c3) = mtx.columns
-        c3 = simd_float4(0, 0, 0, 1) //zero out translation components
+        c3 = simd_float4(0, 0, 0, 1) // zero out translation components
         c0 /= scale[0]
         c1 /= scale[1]
         c2 /= scale[2]

Vocable/HeadTracking/Interpolation/PulseController/TunningView.swift

@@ -152,7 +152,7 @@ class TunningView: UIView {
     @objc func buttonPressed() {
         switch visibilityState {
         case .fullyVisible:
-            visibilityState = .notVisible//.graphOnly
+            visibilityState = .notVisible // .graphOnly
         case .graphOnly:
             visibilityState = .notVisible
         case .notVisible:

Vocable/HeadTracking/UIHeadGaze.swift

@@ -4,8 +4,8 @@ class UIHeadGaze: UITouch {
 
     private weak var _window: UIWindow?
     private let _receiver: UIView
-    private let _position: CGPoint //NDC coordinates [0,1] x [0,1], origin is lower left corner of the screen
-    private let _previousPosition: CGPoint //NDC coordinates [0,1] x [0,1], origin is lower left corner of the screen
+    private let _position: CGPoint // NDC coordinates [0,1] x [0,1], origin is lower left corner of the screen
+    private let _previousPosition: CGPoint // NDC coordinates [0,1] x [0,1], origin is lower left corner of the screen
 
     /**
      The time when the event occurred