如何将图像添加到摄像头覆盖视图(swift4)

在Swift 4中，您可以通过以下步骤将图像添加到摄像头覆盖视图：

1. 导入必要的库和框架：import UIKit import AVFoundation
2. 创建一个视图控制器，并将其设置为摄像头的代理：class CameraViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate { // ... }
3. 在视图控制器中添加以下属性：var captureSession: AVCaptureSession? var videoPreviewLayer: AVCaptureVideoPreviewLayer? var overlayImageView: UIImageView?
4. 在视图控制器的viewDidLoad()方法中初始化摄像头会话和预览图层：override func viewDidLoad() { super.viewDidLoad() // 初始化摄像头会话 captureSession = AVCaptureSession() // 设置输入设备为摄像头 guard let captureDevice = AVCaptureDevice.default(for: .video) else { return } guard let input = try? AVCaptureDeviceInput(device: captureDevice) else { return } captureSession?.addInput(input) // 设置输出数据类型为视频帧 let videoOutput = AVCaptureVideoDataOutput() videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue")) captureSession?.addOutput(videoOutput) // 初始化预览图层 videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession!) videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill videoPreviewLayer?.frame = view.layer.bounds view.layer.addSublayer(videoPreviewLayer!) // 初始化覆盖图像视图 overlayImageView = UIImageView(frame: view.bounds) overlayImageView?.contentMode = .scaleAspectFit view.addSubview(overlayImageView!) // 启动摄像头会话 captureSession?.startRunning() }
5. 实现captureOutput(_:didOutput:from:)方法来处理每个视频帧，并在其中添加图像到覆盖图像视图：func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) { guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return } // 将视频帧转换为UIImage let ciImage = CIImage(cvPixelBuffer: imageBuffer) let context = CIContext() guard let cgImage = context.createCGImage(ciImage, from: ciImage.extent) else { return } let image = UIImage(cgImage: cgImage) // 在主线程更新UI DispatchQueue.main.async { self.overlayImageView?.image = image } }

通过以上步骤，您可以将摄像头捕获的视频帧转换为UIImage，并将其添加到覆盖图像视图中。这样，您就可以在摄像头预览上方显示自定义的图像。

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