damus

nostr ios client
git clone git://jb55.com/damus
Log | Files | Refs | README | LICENSE

CameraPreview.swift (3133B)

      1 //
      2 //  CameraPreview.swift
      3 //  damus
      4 //
      5 //  Created by Suhail Saqan on 8/5/23.
      6 //
      7 
      8 import UIKit
      9 import AVFoundation
     10 import SwiftUI
     11 
     12 public struct CameraPreview: UIViewRepresentable {
     13     public class VideoPreviewView: UIView {
     14         public override class var layerClass: AnyClass {
     15             AVCaptureVideoPreviewLayer.self
     16         }
     17 
     18         var videoPreviewLayer: AVCaptureVideoPreviewLayer {
     19             return layer as! AVCaptureVideoPreviewLayer
     20         }
     21 
     22         let focusView: UIView = {
     23             let focusView = UIView(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
     24             focusView.layer.borderColor = UIColor.white.cgColor
     25             focusView.layer.borderWidth = 1.5
     26             focusView.layer.cornerRadius = 15
     27             focusView.layer.opacity = 0
     28             focusView.backgroundColor = .clear
     29             return focusView
     30         }()
     31 
     32         @objc func focusAndExposeTap(gestureRecognizer: UITapGestureRecognizer) {
     33             let layerPoint = gestureRecognizer.location(in: gestureRecognizer.view)
     34 
     35             guard layerPoint.x >= 0 && layerPoint.x <= bounds.width &&
     36                     layerPoint.y >= 0 && layerPoint.y <= bounds.height else {
     37                 return
     38             }
     39 
     40             let devicePoint = videoPreviewLayer.captureDevicePointConverted(fromLayerPoint: layerPoint)
     41 
     42             self.focusView.layer.frame = CGRect(origin: layerPoint, size: CGSize(width: 30, height: 30))
     43 
     44             NotificationCenter.default.post(.init(name: .init("UserDidRequestNewFocusPoint"), object: nil, userInfo: ["devicePoint": devicePoint] as [AnyHashable: Any]))
     45 
     46             UIView.animate(withDuration: 0.3, animations: {
     47                 self.focusView.layer.opacity = 1
     48             }) { (completed) in
     49                 if completed {
     50                     UIView.animate(withDuration: 0.3) {
     51                         self.focusView.layer.opacity = 0
     52                     }
     53                 }
     54             }
     55         }
     56 
     57         public override func layoutSubviews() {
     58             super.layoutSubviews()
     59 
     60             videoPreviewLayer.videoGravity = .resizeAspectFill
     61 
     62             self.layer.addSublayer(focusView.layer)
     63 
     64             let gRecognizer = UITapGestureRecognizer(target: self, action: #selector(VideoPreviewView.focusAndExposeTap(gestureRecognizer:)))
     65             self.addGestureRecognizer(gRecognizer)
     66         }
     67     }
     68 
     69     public let session: AVCaptureSession
     70 
     71     public init(session: AVCaptureSession) {
     72         self.session = session
     73     }
     74 
     75     public func makeUIView(context: Context) -> VideoPreviewView {
     76         let viewFinder = VideoPreviewView()
     77         viewFinder.backgroundColor = .black
     78         viewFinder.videoPreviewLayer.cornerRadius = 20
     79         viewFinder.videoPreviewLayer.session = session
     80         viewFinder.videoPreviewLayer.connection?.videoOrientation = .portrait
     81 
     82         return viewFinder
     83     }
     84 
     85     public func updateUIView(_ uiView: VideoPreviewView, context: Context) {
     86 
     87     }
     88 }
     89 
     90 struct CameraPreview_Previews: PreviewProvider {
     91     static var previews: some View {
     92         CameraPreview(session: AVCaptureSession())
     93             .frame(height: 300)
     94     }
     95 }