作者：朱克锋

邮箱：zhukefeng@iboxpay.com

转载请注明出处：http://blog.csdn.net/linux_zkf

-(void) turnOnLed:(bool)update

{  

    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];  

    if ([device hasTorch]) {  

        [device lockForConfiguration:nil];  

        [device setTorchMode: AVCaptureTorchModeOn];  

        [device unlockForConfiguration];  

    }   

}  

-(void) turnOffLed:(bool)update 

{  

    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];  

    if ([device hasTorch]) {  

        [device lockForConfiguration:nil];  

        [device setTorchMode: AVCaptureTorchModeOff];  

        [device unlockForConfiguration];  

    }  

}