// stretchy
[self setBackgroundImage:backgroundImage forState:UIControlStateNormal];

// not stretchy
[self setImage:forgroundImage forState:UIControlStateNormal];

UIImageView *bgImageView = [[UIImageView alloc] initWithImage:img];
bgImageView.contentMode = UIViewContentModeScaleAspectFit;
[bgImageView setFrame:CGRectMake(0, 0, videoButton.frame.size.width, videoButton.frame.size.height)];
bgImageView.tag = 99;
[yourButton addSubview:bgImageView];
[yourButton bringSubviewToFront:yourButton.imageView];

UIImageView *bgImageView = (UIImageView *)[button viewWithTag:99];
[bgImageView setFrame:CGRectMake(0, 0, newWidth, newHeight)];

myButton.titleEdgeInsets = UIEdgeInsetsMake(0, -myImage.width, 0, 0)

UIImage *img=[UIImage imageNamed:@"myimage.png"];
CGImageRef imgRef = [img CGImage];
CGFloat imgW = CGImageGetWidth(imgRef);
CGFloat imgH = CGImageGetHeight(imgRef);
CGFloat btnW = myBttn.frame.size.width;
CGFloat btnH = myBttn.frame.size.height;
//get lesser button dimension
CGFloat minBtn=btnW;
if (btnW>btnH) {
    minBtn=btnH;
}
//calculate scale using greater image dimension
CGFloat scl=imgH/minBtn;
if (imgW>imgH) {
    scl=imgW/minBtn;
}
//scale image
UIImage *scaledImage = [UIImage imageWithCGImage:[img CGImage] scale:(img.scale * scl) orientation:(img.imageOrientation)];
//clean up
UIGraphicsEndImageContext();
//set it on a button
[myBttn setImage:scaledImage forState:UIControlStateNormal];

ImageBn.imageView?.contentMode = .scaleAspectFit
    ImageBn.setImage(chosenImage, for: .normal)

- (void)setHighlighted:(BOOL)highlighted
{
super.highlighted = highlighted;

//
//Whenever an image needs to be highlighted, create a dimmed new image that is correctly       sized. Below it is a englarged stretched image.
//
if (highlighted != _previousHighlightedSate)
{
    _previousHighlightedSate = highlighted;

    if (highlighted)
    {
        //Create a black layer so image can dim
        _blackLayer = [CALayer layer];
        _blackLayer.bounds = self.bounds;
        CGRect rect = _blackLayer.bounds;
        rect.size.width = rect.size.width*2;
        rect.size.height = rect.size.height*2;
        _blackLayer.bounds = rect;
        _blackLayer.backgroundColor = [[UIColor blackColor] CGColor];

        //create image layer
        _nonStretchImageLayer = [CALayer layer];
        _nonStretchImageLayer.backgroundColor = [UIColor blackColor].CGColor;
        _nonStretchImageLayer.bounds = CGRectMake(0  , 0, self.bounds.size.width, self.bounds.size.height);
        _nonStretchImageLayer.frame = CGRectMake(0  , 0, self.bounds.size.width, self.bounds.size.height);
        _nonStretchImageLayer.contentsGravity = kCAGravityResizeAspect;//default is to resize
        _nonStretchImageLayer.contents = (id)self.imageView.image.CGImage;
        _nonStretchImageLayer.opacity = 0.5;

        //add layers to image view
        [self.imageView.layer addSublayer:_blackLayer];
        [self.imageView.layer addSublayer:_nonStretchImageLayer];
    }
    else
    {
        //remove from image view
        [_blackLayer removeFromSuperlayer];
        [_nonStretchImageLayer removeFromSuperlayer];

        //nil them out.
        _blackLayer = nil;
        _nonStretchImageLayer = nil;
    }
}