UIImagePickerController simple example, Override camera button, OverlayView example

*.m

@interface ViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>{
    NSMutableArray* _capturedImages;
}
@property(nonatomic, retain)NSMutableArray* capturedImages;
@end



    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    
    if (imagePickerController.sourceType == UIImagePickerControllerSourceTypeCamera){

        imagePickerController.showsCameraControls = NO;
        imagePickerController.cameraOverlayView = self.overlayView;
        imagePickerController.delegate = self;
        self.overlayView = nil;
    }
    self.imagePickerController = imagePickerController;


// The method have to pass (id)sender as parameter in order to work:)
- (void)takePicture:(id)sender
{
    NSLog(@"takePicture()");
    [self.imagePickerController takePicture];
}

#pragma mark - UIImagePickerControllerDelegate

// This method is called when an image has been chosen from the library or taken from the camera.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
    [self.capturedImages addObject:image];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:NULL];
}

UIImagePickerController simple example
note: - (void)takePicture:(id)sender has to be this form in order to work,
Take a while to figure it out.
Initially use:
(void)takePicture{
}
but the camera can't take any picture

Two Lines are important
imagePickerController.showsCameraControls = NO;
UIView* overlayView = [UIView alloc]init];
imagePickerController.cameraOverlayView = self.overlayView;