Detect camera condition in AVCaptureSession swift - swift

Question

I am working on a swift application and I want to take a picture during the video when the camera is not moving or when user focuses on something.
i used AVCaptureVideoDataOutputSampleBufferDelegate *captureOutput method which giving me image every time after starting camera. but I want to take only when the camera is not moving or focused.
func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
print("didOutput")
guard let hasImage = CMSampleBufferGetImageBuffer(sampleBuffer) else {
print("no image")
return
}
let ciimage : CIImage = CIImage(cvPixelBuffer: hasImage)
DispatchQueue.main.async {
self.liveCamImage = self.convert(cmage: ciimage)
}
}
is there any solution for this

Answer 1

You can try to use adjusting focus property of your capture device (AVCaptureDevice), when it is false the focus is stable. See detailed documentation below.
/**
#property adjustingFocus
#abstract
Indicates whether the receiver is currently performing a focus scan to adjust focus.
#discussion
The value of this property is a BOOL indicating whether the receiver's camera focus is being automatically adjusted by means of a focus scan, because its focus mode is AVCaptureFocusModeAutoFocus or AVCaptureFocusModeContinuousAutoFocus. Clients can observe the value of this property to determine whether the camera's focus is stable.
#seealso lensPosition
#seealso AVCaptureAutoFocusSystem
*/
open var isAdjustingFocus: Bool { get }