IOS Swift – 自定义摄像头覆盖

你好我想在我的应用程序中打开一个像这样

我只想在部分中间打开一个摄像头，所以用户只能在矩形部分进行拍摄

我正在使用的代码是这样的

import UIKit import AVFoundation class TakeProductPhotoController: UIViewController { let captureSession = AVCaptureSession() var previewLayer : AVCaptureVideoPreviewLayer? // If we find a device we'll store it here for later use var captureDevice : AVCaptureDevice? override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. captureSession.sessionPreset = AVCaptureSessionPresetHigh let devices = AVCaptureDevice.devices() // Loop through all the capture devices on this phone for device in devices { // Make sure this particular device supports video if (device.hasMediaType(AVMediaTypeVideo)) { // Finally check the position and confirm we've got the back camera if(device.position == AVCaptureDevicePosition.Back) { captureDevice = device as? AVCaptureDevice if captureDevice != nil { print("Capture device found") beginSession() } } } } } func updateDeviceSettings(focusValue : Float, isoValue : Float) { let error: NSErrorPointer = nil if let device = captureDevice { do { try captureDevice!.lockForConfiguration() } catch let error1 as NSError { error.memory = error1 } device.setFocusModeLockedWithLensPosition(focusValue, completionHandler: { (time) -> Void in // }) // Adjust the iso to clamp between minIso and maxIso based on the active format let minISO = device.activeFormat.minISO let maxISO = device.activeFormat.maxISO let clampedISO = isoValue * (maxISO - minISO) + minISO device.setExposureModeCustomWithDuration(AVCaptureExposureDurationCurrent, ISO: clampedISO, completionHandler: { (time) -> Void in // }) device.unlockForConfiguration() } } func touchPercent(touch : UITouch) -> CGPoint { // Get the dimensions of the screen in points let screenSize = UIScreen.mainScreen().bounds.size // Create an empty CGPoint object set to 0, 0 var touchPer = CGPointZero // Set the x and y values to be the value of the tapped position, divided by the width/height of the screen touchPer.x = touch.locationInView(self.view).x / screenSize.width touchPer.y = touch.locationInView(self.view).y / screenSize.height // Return the populated CGPoint return touchPer } func focusTo(value : Float) { let error: NSErrorPointer = nil if let device = captureDevice { do { try captureDevice!.lockForConfiguration() } catch let error1 as NSError { error.memory = error1 } device.setFocusModeLockedWithLensPosition(value, completionHandler: { (time) -> Void in // }) device.unlockForConfiguration() } } let screenWidth = UIScreen.mainScreen().bounds.size.width override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { //if let touchPer = touches.first { let touchPer = touchPercent( touches.first! as UITouch ) updateDeviceSettings(Float(touchPer.x), isoValue: Float(touchPer.y)) super.touchesBegan(touches, withEvent:event) } override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) { // if let anyTouch = touches.first { let touchPer = touchPercent( touches.first! as UITouch ) // let touchPercent = anyTouch.locationInView(self.view).x / screenWidth // focusTo(Float(touchPercent)) updateDeviceSettings(Float(touchPer.x), isoValue: Float(touchPer.y)) } func configureDevice() { let error: NSErrorPointer = nil if let device = captureDevice { //device.lockForConfiguration(nil) do { try captureDevice!.lockForConfiguration() } catch let error1 as NSError { error.memory = error1 } device.focusMode = .Locked device.unlockForConfiguration() } } func beginSession() { configureDevice() var err : NSError? = nil var deviceInput: AVCaptureDeviceInput! do { deviceInput = try AVCaptureDeviceInput(device: captureDevice) } catch let error as NSError { err = error deviceInput = nil }; captureSession.addInput(deviceInput) if err != nil { print("error: \(err?.localizedDescription)") } previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) self.view.layer.addSublayer(previewLayer!) previewLayer?.frame = self.view.layer.frame captureSession.startRunning() } } 

在这个代码中，相机正在拍摄整个屏幕。

Answer 1

如果您想在自定义UIView启动相机，则需要更改AVCaptureVideoPreviewLayer 。 你可以改变它的边界，它的位置，也可以添加掩码。

来到你的问题，捕捉层正在全屏幕，因为你有：

  previewLayer?.frame = self.view.layer.frame 

将此行更改为该覆盖帧

  previewLayer?.frame = self.overLayView.layer.frame 

或者，如果您想使用原始值手动定位相机图层：

  previewLayer?.frame = CGRectMake(x,y,width,height) 

另外，请注意，如果要在叠加视图中启动相机，则需要将子视图添加到该叠加视图

所以这一行：

  self.view.layer.addSublayer(previewLayer!) 

将是这样的：

  self.overLayView.layer.addSublayer(previewLayer!) 

拉伸图层/适合预览图层：

  previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) var bounds:CGRect bounds=cameraView.layer.frame; previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill; previewLayer!.bounds=bounds; previewLayer!.position=CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds)); self.view.layer.addSublayer(previewLayer!)