斯威夫特:从AVFoundation拍照

Question

我想将这个函数从obj c转换为swift,buti无法翻译部分代码.有人可以解释我如何从AVFondation拍照或帮我翻译这个功能？

- (void) capImage { //method to capture image from AVCaptureSession      video feed
     AVCaptureConnection *videoConnection = nil;
     for (AVCaptureConnection *connection in stillImageOutput.connections) {

  for (AVCaptureInputPort *port in [connection inputPorts]) {

  if ([[port mediaType] isEqual:AVMediaTypeVideo] ) {
    videoConnection = connection;
        break;
  }
  }

   if (videoConnection) {
    break;
 }
}

 NSLog(@"about to request a capture from: %@", stillImageOutput);
[stillImageOutput     captureStillImageAsynchronouslyFromConnection:videoConnection          completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {

  if (imageSampleBuffer != NULL) {
   NSData *imageData = [AVCaptureStillImageOutput        jpegStillImageNSDataRepresentation:imageSampleBuffer];
[self processImage:[UIImage imageWithData:imageData]];
 }
}]; }

我做了什么,但没有工作:

  func takePhoto(sender:UIButton){

  var videoConnection:AVCaptureConnection
  var connection:AVCaptureConnection
   var port : AVCaptureInputPort

 for connection in stillImageOutput?.connections {

for (port in connection.inputPorts as AVCaptureInputPort) {


    if port = AVMediaTypeVideo {
        videoConnection = connection
        break
    }

}

    if videoConnection {
        break
   }


 }
stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection,      completionHandler: {(imageSampleBuffer, error) in
if (imageSampleBuffer != nil) {
    var imageData =      AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageSampleBuffer as CMSampleBuffer)
    var image: UIImage = UIImage(data: imageData)


}
})


}

有人能帮助我吗？

Answer 1

由于上面的代码不起作用,我在Swift中找到了一个优雅的解决方案.

而不是这个:

var videoConnection : AVCaptureConnection?
for connection in self.stillImageOutput.connections{
    for port in connection.inputPorts!{
        if port.mediaType == AVMediaTypeVideo{
            videoConnection = connection as? AVCaptureConnection
            break //for ports
        }
    }
    if videoConnection != nil{
        break //for connections
    }
}//take a photo then

您应该使用此:(更新为"输出"拼写错误)

if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo){//take a photo here}

希望有所帮助!