使用AVCaptureSession切换前/后摄像头 [英] Switch front/back camera with AVCaptureSession
本文介绍了使用AVCaptureSession切换前/后摄像头的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在关注这个问题的唯一答案 -
I'm following the only answer this has on SO -
然而,cameraWithPosition似乎不起作用。已弃用?
However cameraWithPosition does not seem to work. Deprecated?
//Get new input
AVCaptureDevice *newCamera = nil;
if(((AVCaptureDeviceInput*)currentCameraInput).device.position == AVCaptureDevicePositionBack)
{
newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];
}
else
{
newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];
}
推荐答案
你需要做的是重新配置 AVCaptureSession
What you need to do is reconfigure your AVCaptureSession
以下是我正在使用的内容:
Here is what i'm using:
// note that `AVCaptureSession * session`
//
if(session)
{
[session beginConfiguration];
AVCaptureInput *currentCameraInput = [session.inputs objectAtIndex:0];
[session removeInput:currentCameraInput];
AVCaptureDevice *newCamera = nil;
if(((AVCaptureDeviceInput*)currentCameraInput).device.position == AVCaptureDevicePositionBack)
{
newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];
}
else
{
newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];
}
NSError *err = nil;
AVCaptureDeviceInput *newVideoInput = [[AVCaptureDeviceInput alloc] initWithDevice:newCamera error:&err];
if(!newVideoInput || err)
{
NSLog(@"Error creating capture device input: %@", err.localizedDescription);
}
else
{
[session addInput:newVideoInput];
}
[session commitConfiguration];
}
// make sure you have this method in your class
//
- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices)
{
if ([device position] == position)
return device;
}
return nil;
}
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