iOS 镜头变焦，推近或者拉远焦距--ZOOM

数码相机中，zoom就是缩放意思；也就是镜头变焦的意思，推近或者拉远焦距

/**调节ZOOM */

- (IBAction)zoomChangeValue:(UISlider *)sender

{

   NSError *error = nil;

    [self.camereManager.captureDevicelockForConfiguration:&error];

   if (!error) {

       self.camereManager.captureDevice.videoZoomFactor = sender.value;

    }else

    {

       NSLog(@"error = %@", error);

    }

    [self.camereManager.captureDeviceunlockForConfiguration];

}

/**放大缩小屏幕 */

- (IBAction)viewScaleChnageValue:(UISlider *)sender

{

   self.previewView.transform =CGAffineTransformMakeScale(sender.value, sender.value);

}

/**

   

   ZOOM:镜头变焦，推近或者拉远焦距,拍照后有效果

  放大缩小屏幕：放大缩小后拍照无效果

 */

详细代码：手动调焦ZOOM