Question

我正在使用一个库来使用相机和视频https://github.com/yonat/CameraBackground在我的swift应用上创建自定义相机

但是我有点延迟，并且当闪光灯设置关闭时，相机会使用闪光灯拍摄图像在将摄像机的模式从视频切换为静止图像时，我试图在更改输出后拍摄图像

不幸的是，如果我不设置延迟，它将返回深色图像。

代码：

@IBAction func startCapture(_ sender: Any) {
    DispatchQueue.background(delay: 0.1, background: {
        // do something in background
        let currentSession =  self.previewLiveCamera.cameraLayer?.session
        currentSession!.sessionPreset = AVCaptureSession.Preset.photo
        currentSession!.addOutput(AVCaptureStillImageOutput())


    }, completion: {
        // when background job finishes, wait 3 seconds and do something in main thread

        self.previewLiveCamera.takeCameraSnapshot( {
            // animate snapshot capture
            print("Starting...")
        },
          completion: { (capturedImage, error) -> () in
            if capturedImage != nil {
                print("compleated with image")
                RZTransitionsManager.shared().defaultPresentDismissAnimationController = RZZoomAlphaAnimationController()
                let storyboard = UIStoryboard(name: "Main", bundle: nil)
                let nextViewController = storyboard.instantiateViewController(withIdentifier: "post") as! PostViewController
                nextViewController.image = capturedImage
                nextViewController.transitioningDelegate = RZTransitionsManager.shared()
                self.present(nextViewController, animated: true, completion: {
                    self.previewLiveCamera.removeCameraBackground()
                    self.addvideoCamBackground()
                    self.hideCaptureBtns()
                    self.progressView.popIn()
                    self.progressView.transform = CGAffineTransform(rotationAngle: .pi)
                })

            }

        })
    })

}

Answer 1

CameraBackground自述文件的用法：

view.addCameraBackground()
// ...
view.takeCameraSnapshot( {
    // animate snapshot capture
    self.view.alpha = 0
    UIView.animate(withDuration: 1) { self.view.alpha = 1 }
}, completion: { (capturedImage, error) -> () in
    self.view.freeCameraSnapshot() // unfreeze image
    // ... handle capturedImage and error
})
// ...
view.removeCameraBackground()

您可以看到，在此用法中，此间隔用于设置可见性，因此，如果您从代码中删除延迟，则alpha保持为0。因此，请使用它在GitHub中的代码描述方式：

view.addCameraBackground()

view.takeCameraSnapshot( {
    print("Starting...")
    self.view.alpha = 0
    UIView.animate(withDuration: 1) { self.view.alpha = 1 }
}, completion: { (capturedImage, error) -> () in
    self.view.freeCameraSnapshot()
    if capturedImage != nil {
        print("compleated with image")
        RZTransitionsManager.shared().defaultPresentDismissAnimationController = RZZoomAlphaAnimationController()
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let nextViewController = storyboard.instantiateViewController(withIdentifier: "post") as! PostViewController
        nextViewController.image = capturedImage
        nextViewController.transitioningDelegate = RZTransitionsManager.shared()
        self.present(nextViewController, animated: true, completion: {
            self.previewLiveCamera.removeCameraBackground()
            self.addvideoCamBackground()
            self.hideCaptureBtns()
            self.progressView.popIn()
            self.progressView.transform = CGAffineTransform(rotationAngle: .pi)
        })

    }
})

view.removeCameraBackground()

AVCaptureVideoPreviewLayer从视频切换并在静止图像模式下拍摄图像时的延迟

1 个答案: