小编sco*_*ott的帖子

didOutputSampleBuffer成功调用我的方法,直到我使用此功能切换摄像机:

func switchCameras() {

    captureSession.beginConfiguration()
    captureSession.sessionPreset = AVCaptureSessionPresetMedium
    var error : NSError? = nil
    for input in captureSession.inputs {
        captureSession.removeInput(input as! AVCaptureInput)
    }
    if currentCamera == "back" {
        currentCamera = "front"

        if captureSession.canAddInput(AVCaptureDeviceInput(device: frontCamera, error: &error)) {
            captureSession.addInput(AVCaptureDeviceInput(device: frontCamera, error: &error))
        } else {
            print(error)
        }
    } else {
        currentCamera = "back"
        if captureSession.canAddInput(AVCaptureDeviceInput(device: backCamera, error: &error)) {
            captureSession.addInput(AVCaptureDeviceInput(device: backCamera, error: &error))
        } else {
        }
    }
    print("chagned")
    captureSession.commitConfiguration()
}

切换后,这种方法有时会丢帧,所以我无法拍照.大约5秒后,帧回来了.

func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: …