我试图在UIViewController中的UIView的背景上设置摄像头,以便能够在其上进行绘制。
怎么做?
最佳答案
已更新为SWIFT 5
您可以尝试这样的事情:
我在UIView
的主 View 中添加了两个UIViewController
,一个名为previewView
(用于相机),另一个名为UIView
(位于相机 View 上方)
class ViewController: UIViewController {
var previewView : UIView!
var boxView:UIView!
//Camera Capture requiered properties
var videoDataOutput: AVCaptureVideoDataOutput!
var videoDataOutputQueue: DispatchQueue!
var previewLayer:AVCaptureVideoPreviewLayer!
var captureDevice : AVCaptureDevice!
let session = AVCaptureSession()
var currentFrame: CIImage!
var done = false
override func viewDidLoad() {
super.viewDidLoad()
previewView = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
previewView.contentMode = .scaleAspectFit
view.addSubview(previewView)
//Add a box view
boxView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 200))
boxView.backgroundColor = UIColor.green
boxView.alpha = 0.3
view.addSubview(boxView)
self.setupAVCapture()
}
override func viewWillAppear(_ animated: Bool) {
if !done {
session.startRunning()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override var shouldAutorotate: Bool {
if (UIDevice.current.orientation == UIDeviceOrientation.landscapeLeft ||
UIDevice.current.orientation == UIDeviceOrientation.landscapeRight ||
UIDevice.current.orientation == UIDeviceOrientation.unknown) {
return false
}
else {
return true
}
}
}
// AVCaptureVideoDataOutputSampleBufferDelegate protocol and related methods
extension ViewController: AVCaptureVideoDataOutputSampleBufferDelegate{
func setupAVCapture(){
session.sessionPreset = AVCaptureSession.Preset.vga640x480
guard let device = AVCaptureDevice
.default(AVCaptureDevice.DeviceType.builtInWideAngleCamera,
for: .video,
position: AVCaptureDevice.Position.front) else{
return
}
captureDevice = device
beginSession()
done = true
}
func beginSession(){
var deviceInput: AVCaptureDeviceInput!
do {
deviceInput = try AVCaptureDeviceInput(device: captureDevice)
guard deviceInput != nil else {
print("error: cant get deviceInput")
return
}
if self.session.canAddInput(deviceInput){
self.session.addInput(deviceInput)
}
videoDataOutput = AVCaptureVideoDataOutput()
videoDataOutput.alwaysDiscardsLateVideoFrames=true
videoDataOutputQueue = DispatchQueue(label: "VideoDataOutputQueue")
videoDataOutput.setSampleBufferDelegate(self, queue:self.videoDataOutputQueue)
if session.canAddOutput(self.videoDataOutput){
session.addOutput(self.videoDataOutput)
}
videoDataOutput.connection(with: AVMediaType.video)?.isEnabled = true
self.previewLayer = AVCaptureVideoPreviewLayer(session: self.session)
self.previewLayer.videoGravity = AVLayerVideoGravity.resizeAspect
let rootLayer: CALayer = self.previewView.layer
rootLayer.masksToBounds = true
self.previewLayer.frame = rootLayer.bounds
rootLayer.addSublayer(self.previewLayer)
session.startRunning()
} catch let error as NSError {
deviceInput = nil
print("error: \(error.localizedDescription)")
}
}
func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
currentFrame = self.convertImageFromCMSampleBufferRef(sampleBuffer)
}
// clean up AVCapture
func stopCamera(){
session.stopRunning()
done = false
}
func convertImageFromCMSampleBufferRef(_ sampleBuffer:CMSampleBuffer) -> CIImage{
let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
let ciImage:CIImage = CIImage(cvImageBuffer: pixelBuffer)
return ciImage
}
}
您可以将boxView的
boxView
替换为mainView的frame
,而无需设置其background属性。这样,您可以使用此 View 添加更多 subview 。这是显示“摄像机”访问请求的屏幕截图
希望对您有所帮助!
关于ios - 在UIView的背景上设置摄像头,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/28397800/