如何将代码AVFoundation目标c转换为Swift？ [英] How to convert code AVFoundation objective c to Swift?

问题描述

我使用AVFoundation在swift拍照，但我不能将任何func行从客观c转换为Swift。我的功能代码是：

I am using AVFoundation in swift for take pictures but I can't convert any func lines of code from objective c to Swift. My func code is:

 - (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]];
    }
}];

}

AnyObject []不符合协议sequencfe ..：

This line send me error AnyObject[]does not conform to protocol sequencfe..:

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

在swift中：

  for port:AnyObject in connection.inputPorts {

这行：

 [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {

可以帮我转换成swift吗？
谢谢！

Can u help me to convert to swift? Thanks!!

推荐答案

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

数组 AnyObject 在交互之前转换为你的实际类型的数组，像这样：

Arrays of AnyObject should be cast to arrays of your actual type before interating, like this:

for (port in connection.inputPorts as AVCaptureInputPort[]) { }

对于闭包，只需要获得正确的语法。

In terms of blocks to closures, you just have to get the syntax correct.

stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
    (imageSampleBuffer, error) in // This line defines names the inputs
    //...
}

注意，这也使用跟踪关闭语法。

编辑：在初始化器方面，它们现在看起来像这样：

In terms of initializers, they now look like this:

let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageSampleBuffer)
self.processImage(UIImage(data:imageData))

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