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camera: add CameraPreview for displaying the view the camera is reading
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // | ||
| // CameraPreview.swift | ||
| // damus | ||
| // | ||
| // Created by Suhail Saqan on 8/5/23. | ||
| // | ||
|
|
||
| import UIKit | ||
| import AVFoundation | ||
| import SwiftUI | ||
|
|
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| public struct CameraPreview: UIViewRepresentable { | ||
| public class VideoPreviewView: UIView { | ||
| public override class var layerClass: AnyClass { | ||
| AVCaptureVideoPreviewLayer.self | ||
| } | ||
|
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| var videoPreviewLayer: AVCaptureVideoPreviewLayer { | ||
| return layer as! AVCaptureVideoPreviewLayer | ||
| } | ||
|
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| let focusView: UIView = { | ||
| let focusView = UIView(frame: CGRect(x: 0, y: 0, width: 30, height: 30)) | ||
| focusView.layer.borderColor = UIColor.white.cgColor | ||
| focusView.layer.borderWidth = 1.5 | ||
| focusView.layer.cornerRadius = 15 | ||
| focusView.layer.opacity = 0 | ||
| focusView.backgroundColor = .clear | ||
| return focusView | ||
| }() | ||
|
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| @objc func focusAndExposeTap(gestureRecognizer: UITapGestureRecognizer) { | ||
| let layerPoint = gestureRecognizer.location(in: gestureRecognizer.view) | ||
|
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| guard layerPoint.x >= 0 && layerPoint.x <= bounds.width && | ||
| layerPoint.y >= 0 && layerPoint.y <= bounds.height else { | ||
| return | ||
| } | ||
|
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| let devicePoint = videoPreviewLayer.captureDevicePointConverted(fromLayerPoint: layerPoint) | ||
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| self.focusView.layer.frame = CGRect(origin: layerPoint, size: CGSize(width: 30, height: 30)) | ||
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| NotificationCenter.default.post(.init(name: .init("UserDidRequestNewFocusPoint"), object: nil, userInfo: ["devicePoint": devicePoint] as [AnyHashable: Any])) | ||
|
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| UIView.animate(withDuration: 0.3, animations: { | ||
| self.focusView.layer.opacity = 1 | ||
| }) { (completed) in | ||
| if completed { | ||
| UIView.animate(withDuration: 0.3) { | ||
| self.focusView.layer.opacity = 0 | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| public override func layoutSubviews() { | ||
| super.layoutSubviews() | ||
|
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| videoPreviewLayer.videoGravity = .resizeAspectFill | ||
|
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| self.layer.addSublayer(focusView.layer) | ||
|
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| let gRecognizer = UITapGestureRecognizer(target: self, action: #selector(VideoPreviewView.focusAndExposeTap(gestureRecognizer:))) | ||
| self.addGestureRecognizer(gRecognizer) | ||
| } | ||
| } | ||
|
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| public let session: AVCaptureSession | ||
|
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| public init(session: AVCaptureSession) { | ||
| self.session = session | ||
| } | ||
|
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| public func makeUIView(context: Context) -> VideoPreviewView { | ||
| let viewFinder = VideoPreviewView() | ||
| viewFinder.backgroundColor = .black | ||
| viewFinder.videoPreviewLayer.cornerRadius = 20 | ||
| viewFinder.videoPreviewLayer.session = session | ||
| viewFinder.videoPreviewLayer.connection?.videoOrientation = .portrait | ||
|
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| return viewFinder | ||
| } | ||
|
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| public func updateUIView(_ uiView: VideoPreviewView, context: Context) { | ||
|
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| } | ||
| } | ||
|
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| struct CameraPreview_Previews: PreviewProvider { | ||
| static var previews: some View { | ||
| CameraPreview(session: AVCaptureSession()) | ||
| .frame(height: 300) | ||
| } | ||
| } |