目前,我有一个 AVCaptureSession 在我的 Swift 应用程序中运行,我有一个带有 CGRect 的 UIView,我想在相机源上四处移动。我一直在尝试通过更改 captureOutput 函数中的坐标来更新 UIView 框架的位置,但是当我更改它们时,它们不会更新。更改 UIView 的位置以使其即时更新的正确方法是什么?
这是进行捕获 session 的代码部分:
class CameraViewController: UIViewController, UIImagePickerControllerDelegate, AVCaptureVideoDataOutputSampleBufferDelegate
{
@IBOutlet weak var cameraView: UIImageView!
var rectangleView : UIView!
var captureSession : AVCaptureSession?
var previewLayer : AVCaptureVideoPreviewLayer?
var rect = CGRect(x: 150, y: 150, width: 50, height: 50)
var xCoord: Float = 0.0
override func viewDidLoad() {
super.viewDidLoad()
//---editing rectangle view---
rectangleView = UIView()
rectangleView.layer.borderColor = UIColor(hue: 0.2444, saturation: 1, brightness: 0.96, alpha: 1).cgColor
rectangleView.layer.borderWidth = 50;
rectangleView.tag = 1
self.view.addSubview(rectangleView)
//----------------------------
captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSessionPreset1920x1080
let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var input = AVCaptureDeviceInput()
do{
input = try AVCaptureDeviceInput(device: backCamera)
}catch{
print("Error finding back Camera")
}
var error : NSError?
if (error == nil && (captureSession?.canAddInput(input))!)
{
captureSession?.addInput(input)
let dataOutput = AVCaptureVideoDataOutput()
dataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "string buffer delegate"))
if (captureSession?.canAddOutput(dataOutput))!
{
captureSession?.addOutput(dataOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
// cameraView.layer.addSublayer(previewLayer!)
self.view.layer.addSublayer(previewLayer!)
self.view.bringSubview(toFront: rectangleView)
previewLayer?.frame = self.view.bounds
rectangleView.frame = rect
captureSession?.startRunning()
}
}
}
这是 captureOutput 函数: setY 方法是 UIView 类的扩展,可更改框架的 y 坐标。
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer!)
let x = rectangleView.frame.origin.x
let y = rectangleView.frame.origin.y - 1
let height = rectangleView.frame.size.height
let width = rectangleView.frame.size.width
rectangleView.setY(y: y)
print(rectangleView.frame.origin.y)
//*** Making UIImage out of pixelBuffer ****
let ciImage = CIImage(cvPixelBuffer: pixelBuffer!)
let pixelBufferWidth = CGFloat(CVPixelBufferGetWidth(pixelBuffer!))
let pixelBufferHeight = CGFloat(CVPixelBufferGetHeight(pixelBuffer!))
let imageRect:CGRect = CGRect(x: 0,y: 0,width: pixelBufferWidth, height: pixelBufferHeight)
let ciContext = CIContext.init()
let cgimage = ciContext.createCGImage(ciImage, from: imageRect )
let image = UIImage(cgImage: cgimage!)
//******************************************
}
感谢您的帮助,
-nfarrell
最佳答案
您需要在主线程上调用 setY(y:)
方法,因为它正在操纵 UI:
DispatchQueue.main.async {
self.rectangleView.setY(y: y)
}
关于ios - 更改 UIView 在 captureOutput 中的位置,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42034562/