UIImagePickerController doesn't fill screen

Question

I'm adding a custom overlay to the UIImagePickerController and there is a persistant black bar at the bottom of the view. Here is my code to instantiate the controller.

- (UIImagePickerController *)imagePicker {
    if (_imagePicker) {
        return _imagePicker;
    }

    _imagePicker = [[UIImagePickerController alloc] init];
    _imagePicker.delegate = self;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        _imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

        _imagePicker.showsCameraControls = NO;

        _imagePicker.wantsFullScreenLayout = YES;
        _imagePicker.navigationBarHidden = YES;
        _imagePicker.toolbarHidden = YES;

    } else {
        _imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }

    return _imagePicker;
}

The returned controller is displayed modally and works just fine (i.e. displays full screen) when I'm not hiding the camera controls.

---

Thanks to Ole's suggestion I got it working with this code:

// Resize the camera preview
        _imagePicker.cameraViewTransform = CGAffineTransformMakeScale(1.0, 1.03);

A 3% increase in height worked just fine. When I add my custom toolbar at the bottom of the screen there is no longer a visible black bar across the window.

Answer 1

The camera's aspect ratio is 4:3 and the screen's aspect ratio is 3:2. So there is simply no way for the camera picture to fill the screen unless you're willing to crop is to 3:2. To do that, apply an appropriate scale transform.

Answer 2

Transform it with this:

#define CAMERA_TRANSFORM                    1.12412

_picker.wantsFullScreenLayout = YES;
_picker.cameraViewTransform = CGAffineTransformScale(_picker.cameraViewTransform, CAMERA_TRANSFORM, CAMERA_TRANSFORM);

Answer 3

are you sure you apply that transform value to both X & Y coordinates? I thought you just applied to Y