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Pods/ZLPhotoBrowser/Sources/General/ZLCameraCell.swift

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+//
+//  ZLCameraCell.swift
+//  ZLPhotoBrowser
+//
+//  Created by long on 2020/8/19.
+//
+//  Copyright (c) 2020 Long Zhang <495181165@qq.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import UIKit
+import AVFoundation
+
+class ZLCameraCell: UICollectionViewCell {
+    
+    private lazy var imageView: UIImageView = {
+        let view = UIImageView(image: .zl.getImage("zl_takePhoto"))
+        view.contentMode = .scaleAspectFit
+        view.clipsToBounds = true
+        return view
+    }()
+    
+    private var session: AVCaptureSession?
+    
+    private var videoInput: AVCaptureDeviceInput?
+    
+    private var photoOutput: AVCapturePhotoOutput?
+    
+    private var previewLayer: AVCaptureVideoPreviewLayer?
+    
+    var isEnable: Bool = true {
+        didSet {
+            contentView.alpha = isEnable ? 1 : 0.3
+        }
+    }
+    
+    deinit {
+        session?.stopRunning()
+        session = nil
+        zl_debugPrint("ZLCameraCell deinit")
+    }
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setupUI()
+    }
+    
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        imageView.center = CGPoint(x: bounds.midX, y: bounds.midY)
+        
+        previewLayer?.frame = contentView.layer.bounds
+    }
+    
+    private func setupUI() {
+        layer.masksToBounds = true
+        layer.cornerRadius = ZLPhotoUIConfiguration.default().cellCornerRadio
+        
+        contentView.addSubview(imageView)
+        backgroundColor = .zl.cameraCellBgColor
+    }
+    
+    private func setupSession() {
+        guard session == nil, (session?.isRunning ?? false) == false else {
+            return
+        }
+        session?.stopRunning()
+        if let input = videoInput {
+            session?.removeInput(input)
+        }
+        if let output = photoOutput {
+            session?.removeOutput(output)
+        }
+        session = nil
+        previewLayer?.removeFromSuperlayer()
+        previewLayer = nil
+        
+        guard let camera = backCamera() else {
+            return
+        }
+        guard let input = try? AVCaptureDeviceInput(device: camera) else {
+            return
+        }
+        videoInput = input
+        photoOutput = AVCapturePhotoOutput()
+        
+        session = AVCaptureSession()
+        
+        if session?.canAddInput(input) == true {
+            session?.addInput(input)
+        }
+        if session?.canAddOutput(photoOutput!) == true {
+            session?.addOutput(photoOutput!)
+        }
+        
+        previewLayer = AVCaptureVideoPreviewLayer(session: session!)
+        contentView.layer.masksToBounds = true
+        previewLayer?.frame = contentView.layer.bounds
+        previewLayer?.videoGravity = .resizeAspectFill
+        contentView.layer.insertSublayer(previewLayer!, at: 0)
+        
+        session?.startRunning()
+    }
+    
+    private func backCamera() -> AVCaptureDevice? {
+        let devices = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .back).devices
+        for device in devices {
+            if device.position == .back {
+                return device
+            }
+        }
+        return nil
+    }
+    
+    func startCapture() {
+        let status = AVCaptureDevice.authorizationStatus(for: .video)
+        
+        if !UIImagePickerController.isSourceTypeAvailable(.camera) || status == .denied {
+            return
+        }
+        
+        if status == .notDetermined {
+            AVCaptureDevice.requestAccess(for: .video) { granted in
+                if granted {
+                    ZLMainAsync {
+                        self.setupSession()
+                    }
+                }
+            }
+        } else {
+            setupSession()
+        }
+    }
+    
+}