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我不太确定这里发生了什么......相机预览层似乎冻结并且 captureStill... 块永远不会被执行。但是，如果我在开始执行应用程序时关闭闪光灯，它会很好地捕捉图片。还应该注意的是，我遇到了这个线程：在 AVCaptureDevice 上切换 Flash 需要停止和启动 AVCaptureSEssion并决定继续尝试停止会话并再次启动它，它似乎有效。不再冻结，但是在关闭会话并重新打开时，相机会稍微冻结，这是不可接受的。想法？

- (void)cameraButtonPressed{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[device lockForConfiguration:nil];

if ([defaults objectForKey:@"Flash"])
{
    SPFlashButton option = [[defaults objectForKey:@"Flash"] intValue];

    if (option == SPFlashButtonTypeOff)
    {
        [device setFlashMode:AVCaptureFlashModeOff];
    }
    else if (option == SPFlashButtonTypeOn)
    {
        [device setFlashMode:AVCaptureFlashModeOn];
    }
    else if (option == SPFlashButtonTypeAuto)
    {
        [device setFlashMode:AVCaptureFlashModeAuto];
    }
}
else
{
    [device setFlashMode:AVCaptureFlashModeAuto];
}

[device unlockForConfiguration];


AVCaptureConnection *stillImageConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections) {
    for (AVCaptureInputPort *port in [connection inputPorts]) {
        if ([[port mediaType] isEqual:AVMediaTypeVideo] ) {
            stillImageConnection = connection;
            break;
        }
    }
    if (stillImageConnection) { break; }
}

UIDeviceOrientation curDeviceOrientation = [[UIDevice currentDevice] orientation];
AVCaptureVideoOrientation avcaptureOrientation = [self avOrientationForDeviceOrientation:curDeviceOrientation];
[stillImageConnection setVideoOrientation:avcaptureOrientation];
[stillImageConnection setVideoScaleAndCropFactor:self.zoomScale];

[stillImageOutput setOutputSettings:[NSDictionary dictionaryWithObject:AVVideoCodecJPEG
                                                                forKey:AVVideoCodecKey]];

[stillImageOutput captureStillImageAsynchronouslyFromConnection:stillImageConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
    NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
    UIImage *image = [UIImage imageWithData:jpegData];

    //do stuff with the image
}];
}
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1 回答 1

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糟糕，我没有将照片设置为会话预设。这就是在尝试使用闪光灯时导致冻结的原因。

我做了什么：

 [captureSession setSessionPreset:AVCaptureSessionPreset640x480];

我应该做的：

 [captureSession setSessionPreset:AVCaptureSessionPresetPhoto];
于 2013-10-09T14:55:34.907 回答