iPhone 打开和关闭闪光灯代码

//打开闪光灯-(void)turnOnLed {   

 AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];        

 if ([device hasTorch]) {       

  [device lockForConfiguration:nil];       

  [device setTorchMode: AVCaptureTorchModeOn];       

  [device unlockForConfiguration];          

 }   

} 

//关闭闪光灯

-(void)turnOffLed {   

 AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];     

 if ([device hasTorch]) {       

  [device lockForConfiguration:nil];       

  [device setTorchMode: AVCaptureTorchModeOff];       

  [device unlockForConfiguration];     

 }   

}