[英]swift photo capture black image
我正在尝试使用Swift设置AVFoundation照片捕获。 预览窗口可以正常工作,但是当我按下按钮捕获照片时,启动该应用程序后拍摄的第一张照片完全是黑色的。 我在运行该应用程序的同一实例中拍摄的所有后续照片均能正常工作,但第一个照片始终只是一个黑色矩形。 拍摄照片时,预览层也会闪烁黑色。 这是我用于相机的代码:
import UIKit
import AVFoundation
class photoCaptureViewController: UIViewController {
let session : AVCaptureSession = AVCaptureSession()
var previewLayer : AVCaptureVideoPreviewLayer!
var output = AVCaptureStillImageOutput()
var capturedImage : UIImage!
override func viewDidLoad() {
super.viewDidLoad()
let device = getFrontCamera()
var error : NSError? = nil
let input : AVCaptureDeviceInput? = AVCaptureDeviceInput.deviceInputWithDevice(device, error: &error) as? AVCaptureDeviceInput
if input != nil {
session.addInput(input)
}else{
println(error)
}
session.sessionPreset = AVCaptureSessionPresetPhoto
previewLayer = AVCaptureVideoPreviewLayer.layerWithSession(session) as! AVCaptureVideoPreviewLayer
previewLayer.frame = CGRectMake(0, 0, 300, 300)
previewLayer.setAffineTransform( CGAffineTransformTranslate(CGAffineTransformMakeScale(0.33, 0.33), -375, -480) )
previewLayer.position = CGPointMake((photoButton.layer.position.x + 70), (photoButton.layer.position.y - 45))
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.view.layer.addSublayer(previewLayer)
self.setPreviewOrientation()
session.startRunning()
}
func setPreviewOrientation() {
let previewLayerConnection: AVCaptureConnection = self.previewLayer.connection
let orientation = AVCaptureVideoOrientation(rawValue: UIDevice.currentDevice().orientation.rawValue)
previewLayerConnection.videoOrientation = orientation!
}
@IBAction func photoButtonPressed(sender: UIButton)
{
output.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if session.canAddOutput(output)
{
session.addOutput(output)
}
var videoConnection = output.connectionWithMediaType(AVMediaTypeVideo)
if videoConnection != nil {
output.captureStillImageAsynchronouslyFromConnection(output.connectionWithMediaType(AVMediaTypeVideo))
{ (imageDataSampleBuffer, error) -> Void in
self.capturedImage = UIImage(data: AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer))
UIImageWriteToSavedPhotosAlbum(self.capturedImage, self,nil, nil)
}}
}
func getFrontCamera() -> AVCaptureDevice{
var result : AVCaptureDevice!
var devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
for device in devices{
if (device.position == AVCaptureDevicePosition.Front) {
result = device as! AVCaptureDevice
}
}
return result
}
}
这是通过移动
output.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if session.canAddOutput(output)
{
session.addOutput(output)
}
而不是将其包含在照片捕获功能中。
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