Ios 在不删除previewLayer的情况下开始新的captureSession
我正在为CameraView创建一个customView，它工作得很好，但是我现在正在从后摄像头更改为前摄像头。我现在已经通过下面的步骤完成了。然而，这似乎创造了一个糟糕的用户体验，它删除了previewLayer（屏幕变为白色），然后正确显示前摄像头。有没有一种方法可以创造更好的用户体验，在显示新会话之前，不要在1秒内将所有内容都变成白色 切换摄像头Ios 在不删除previewLayer的情况下开始新的captureSession,ios,swift,avcapturesession,Ios,Swift,Avcapturesession,我正在为CameraView创建一个customView，它工作得很好，但是我现在正在从后摄像头更改为前摄像头。我现在已经通过下面的步骤完成了。然而，这似乎创造了一个糟糕的用户体验，它删除了previewLayer（屏幕变为白色），然后正确显示前摄像头。有没有一种方法可以创造更好的用户体验，在显示新会话之前，不要在1秒内将所有内容都变成白色 切换摄像头 func switchCamera() { if usingbackCamera == true { endSessio
func switchCamera() {
if usingbackCamera == true {
endSession()
beginSession(frontCamera!)
usingbackCamera = false
self.cameraView.bringSubviewToFront(actionView)
} else {
endSession()
beginSession(backCamera!)
usingbackCamera = true
self.cameraView.bringSubviewToFront(actionView)
}
}
func beginSession(device: AVCaptureDevice) {
do {
captureSession.addInput(try AVCaptureDeviceInput(device: device))
self.previewLayer?.removeFromSuperlayer()
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
self.cameraView.layer.addSublayer(previewLayer!)
previewLayer?.frame = self.cameraView.bounds
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
if captureSession.canAddOutput(videoOutput) {
captureSession.addOutput(videoOutput)
}
} catch let err as NSError {
print(err)
}
}
func endSession() {
self.previewLayer?.removeFromSuperlayer()
captureSession.stopRunning()
captureSession = AVCaptureSession()
}
func beginSession(device: AVCaptureDevice) {
do {
captureSession.addInput(try AVCaptureDeviceInput(device: device))
self.previewLayer?.removeFromSuperlayer()
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
self.cameraView.layer.addSublayer(previewLayer!)
previewLayer?.frame = self.cameraView.bounds
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
if captureSession.canAddOutput(videoOutput) {
captureSession.addOutput(videoOutput)
}
} catch let err as NSError {
print(err)
}
}
func endSession() {
self.previewLayer?.removeFromSuperlayer()
captureSession.stopRunning()
captureSession = AVCaptureSession()
}
func takePicture() {
if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo){
videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
(sampleBuffer, error) in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
let dataProvider = CGDataProviderCreateWithCFData(imageData)
let cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, CGColorRenderingIntent.RenderingIntentDefault)
let image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
self.previewImageView.image = image
self.previewImageView.hidden = false
self.cameraView.bringSubviewToFront(self.previewImageView)
})
}
}
我认为在更改输入设备时不必删除预览层。 该层已绑定到会话，您只需停止会话，删除原始输入并添加新输入，然后再次启动会话 我通过自定义渲染创建捕获视图，但我认为过程将是相同的 捕获片段：
for output in session.outputs {
if let capture = output as? AVCaptureStillImageOutput{
for connection in (capture.connections as! [AVCaptureConnection]){
for port in (connection.inputPorts as! [AVCaptureInputPort]){
if port.mediaType == AVMediaTypeVideo{
capture.captureStillImageAsynchronouslyFromConnection(connection, completionHandler: {(buffer, err) -> Void in
if err != nil{
print(err)
}
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
guard let image = CIImage(data: imageData) else{
completion(nil)
return
}
let rotatedImage = image.imageByApplyingTransform(CGAffineTransformMakeRotation(-CGFloat(M_PI_2)))
})
}
}
}
}
}
从后摄像头切换到前摄像头时，无需停止captureSession并再次启动它，反之亦然 您所需要做的就是删除旧的捕获会话输入，添加新的捕获会话输入以及在开始/提交会话配置块之间的所有输入 下面是一个粗略的例子：
func switchCamera() {
//begin configuration changes
captureSession.beginConfiguration()
//remove the previous inputs
let inputs = captureSession.inputs as! [AVCaptureInput]
for oldInput:AVCaptureInput in inputs {
captureSession.removeInput(oldInput)
}
//add the new input
if usingbackCamera == true {
addInput(frontCamera!)
usingbackCamera = false
self.cameraView.bringSubviewToFront(actionView)
}
else {
addInput(backCamera!)
usingbackCamera = true
self.cameraView.bringSubviewToFront(actionView)
}
//end the configuration
captureSession.commitConfiguration()
}
func addInput(device: AVCaptureDevice) {
do {
captureSession.addInput(try AVCaptureDeviceInput(device: device))
} catch let err as NSError {
print(err)
}
}
这很好，但是切换相机后，拍摄的照片返回
空样本缓冲区。“commitConfigurationcommitConfigurationendConfiguration