在 iPhone 上打开手电筒/闪光灯 [英] Turn on torch/flash on iPhone

问题描述

我知道在 iPhone 4 上开启闪光灯并保持开启的唯一方法是打开摄像机.虽然我不太确定代码.这是我正在尝试的:

I know that the only way to turn on the flash and keep it on on iPhone 4 is by turning the video camera on. I'm not too sure of the code though. Here is what I am trying:

-(IBAction)turnTorchOn {
    AVCaptureSession *captureSession = [[AVCaptureSession alloc] init];
    AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSError *error = nil;
    AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:&error];

    if (videoInput) {
        [captureSession addInput:videoInput];

        AVCaptureVideoDataOutput* videoOutput = [[AVCaptureVideoDataOutput alloc] init];
        [videoOutput setSampleBufferDelegate:self queue:dispatch_get_current_queue()];

        [captureSession addOutput:videoOutput];

        [captureSession startRunning];

        videoCaptureDevice.torchMode = AVCaptureTorchModeOn;
    }   
}

有人知道这是否可行，还是我遗漏了什么?(我还没有要测试的 iPhone 4 - 只是尝试一些新的 API).

Does anybody know if this would work or am I missing anything? (I don't have an iPhone 4 yet to test on -just trying out some of the new API's).

谢谢

推荐答案

lockforConfiguration 在您的代码中设置，您可以在其中声明 AVCaptureDevice 是一个属性.

the lockforConfiguration is set in your code, where you declare your AVCaptureDevice is a property.

[videoCaptureDevice lockForConfiguration:nil];

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