Add grid, camera focus

Caps/Camera/CameraManager.swift

@@ -20,6 +20,8 @@ class CameraManager: ObservableObject {
     private let photoOutput = AVCapturePhotoOutput()
     private var status = Status.unconfigured
 
+    private var camera: AVCaptureDevice?
+
     private init() {
         configure()
     }
@@ -67,11 +69,11 @@ class CameraManager: ObservableObject {
             session.commitConfiguration()
         }
 
-        let device = AVCaptureDevice.default(
+        self.camera = AVCaptureDevice.default(
             .builtInWideAngleCamera,
             for: .video,
             position: .back)
-        guard let camera = device else {
+        guard let camera = camera else {
             set(error: .cameraUnavailable)
             status = .failed
             return
@@ -169,4 +171,28 @@ class CameraManager: ObservableObject {
             self.photoOutput.capturePhoto(with: photoSettings, delegate: delegate)
         }
     }
+
+    // MARK: Focus
+
+    func continuouslyFocusOnMiddle() {
+        guard let device = camera else {
+            return
+        }
+        do {
+            try device.lockForConfiguration()
+
+            if device.isFocusPointOfInterestSupported {
+                device.focusPointOfInterest = CGPoint(x: 0.5, y: 0.5)
+                device.focusMode = .continuousAutoFocus
+            }
+            print("Enabled continuous autofocus")
+            device.unlockForConfiguration()
+        } catch {
+            self.error("Could not lock device for configuration: \(error)")
+        }
+    }
+}
+
+extension CameraManager: Logger {
+
 }

Caps/Camera/CameraView.swift

@@ -87,7 +87,8 @@ struct CameraView: View {
                         .overlay(RoundedRectangle(cornerRadius: circleSize/2)
                             .stroke(lineWidth: circleStrength)
                             .foregroundColor(circleColor))
-
+                        .onTapGesture(perform: didTapCircle)
+                        .background(Color(white: 1, opacity: 0.01))
                     Spacer()
                 }
                 Spacer()
@@ -116,6 +117,10 @@ struct CameraView: View {
     private func capture() {
         model.captureImage()
     }
+
+    private func didTapCircle() {
+        model.continuouslyFocusOnMiddle()
+    }
 }
 
 struct CameraView_Previews: PreviewProvider {

Caps/Camera/ContentViewModel.swift

@@ -54,4 +54,8 @@ class ContentViewModel: ObservableObject {
     func captureImage() {
         cameraManager.capturePhoto(delegate: frameManager)
     }
+
+    func continuouslyFocusOnMiddle() {
+        cameraManager.continuouslyFocusOnMiddle()
+    }
 }