ios - iPhone 6有前置闪光灯吗

Question

当我为前置摄像头设置闪光模式然后调用时

让 videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) stillImageOutput？.captureStillImageAsynchronouslyFromConnection(videoConnection，completionHandler:过程)我收到以下错误消息:

捕获静态图像时出错:Error Domain=AVFoundationErrorDomain Code=-11800“操作无法完成”UserInfo={NSUnderlyingError=0x12eeb7200 {Error Domain=NSOSStatusErrorDomain Code=-16800“(null)”}，NSLocalizedFailureReason=An发生未知错误 (-16800)，NSLocalizedDescription=操作无法完成}

如果我不设置相机的flashMode然后调用:

let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo)
    stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: process)

前置摄像头拍照并没有抛出错误。所以我想知道，iPhone 是否有前置摄像头闪光灯？应该考虑到 Snapchat 有一个。 iPhone 上的默认相机应用程序具有前置摄像头闪光灯。所以我不完全确定发生了什么事。目前，这就是我设置相机的方式:

func getCameraStreamLayer() -> CALayer? {

captureSession = AVCaptureSession()
captureSession!.sessionPreset = AVCaptureSessionPresetPhoto
currentCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput!.outputSettings = [ AVVideoCodecKey: AVVideoCodecJPEG ]

if let input = try? AVCaptureDeviceInput(device: currentCamera) as AVCaptureDeviceInput{
    if captureSession!.canAddInput(input) && captureSession!.canAddOutput(stillImageOutput) {
        captureSession!.addInput(input)
        captureSession!.addOutput(stillImageOutput)
    }
}

return AVCaptureVideoPreviewLayer(session: captureSession)

}

func toggleFlash() {
    flash = !flash
    if flash {
        for case let (device as AVCaptureDevice) in AVCaptureDevice.devices()  {
            if device.hasFlash && device.flashAvailable {
                if device.isFlashModeSupported(.On) {
                    do {
                        try device.lockForConfiguration()
                        device.flashMode = .On
                        device.unlockForConfiguration()


                    } catch {
                        print("Something went wrong")
                    }
                }
            }
        }
    }else {//turn off flash
    }
}


func photograph(process: (CMSampleBuffer!,NSError!)->()) {
    let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo)
    stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: process)

}
    func flipCamera() {
    guard let session = captureSession where session.running == true else {
        return
    }

    session.beginConfiguration()
    let currentCameraInput = session.inputs[0] as! AVCaptureDeviceInput
    session.removeInput(currentCameraInput)


    let newCamera = {
        let devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
        for case let device as AVCaptureDevice in devices {
            if(device.position == .Front && currentCameraInput.device.position == .Back){
                return device
            }
            if(device.position == .Back && currentCameraInput.device.position == .Front){
                return device
            }
        }
        return nil
    }() as AVCaptureDevice?
    currentCamera = newCamera!
    if let newVideoInput = try? AVCaptureDeviceInput(device: newCamera) {
        captureSession?.addInput(newVideoInput)
    }

    captureSession?.commitConfiguration()
}

我不知道我应该做什么。我尝试创建一个新的捕获 session ，然后锁定并设置相机的 flashMode。我仍然遇到同样的错误。

Answer 1

iPhone 6 没有前置闪光灯摄像头，但 iPhone 6s 及更高版本有。

应用商店中有一些“黑客”解决方案，可以使屏幕明亮地闪烁以在前置模式下产生光线，但没有实际的闪光。