NSCollectionViewItem selection on NSImageView, border around image with CALayer

I have a NSCollectionViewItem with NSImageView in it.

I want to have a shadow around the image. Once it is selected, I want the image to have shadow and a border. Currently, NSImageView gets a border around the image.

How can I achieve shadow + border on selection? Seems like the border around image sets up correctly, but the border sets up around the image view.

[self.templateImageView setWantsLayer:YES];
self.templateImageView.layer.borderWidth = 0.0;
self.templateImageView.layer.borderColor = borderColor.CGColor;
self.templateImageView.layer.masksToBounds = YES;

[self.templateImageView.layer setShadowColor: [NSColor blackColor].CGColor];
[self.templateImageView.layer setShadowOpacity:0.8];
[self.templateImageView.layer setShadowRadius:5.0];

First, your image must have a transparent background. Then you can draw a border around the content of images:

func drawOutlie(image:UIImage, color:UIColor) -> UIImage
{
    let newImageKoef:CGFloat = 1.08

    let outlinedImageRect = CGRect(x: 0.0, y: 0.0, width: image.size.width * newImageKoef, height: image.size.height * newImageKoef)

    let imageRect = CGRect(x: image.size.width * (newImageKoef - 1) * 0.5, y: image.size.height * (newImageKoef - 1) * 0.5, width: image.size.width, height: image.size.height)

    UIGraphicsBeginImageContextWithOptions(outlinedImageRect.size, false, newImageKoef)

    image.draw(in: outlinedImageRect)

    let context = UIGraphicsGetCurrentContext()
    context!.setBlendMode(CGBlendMode.sourceIn)

    context!.setFillColor(color.cgColor)
    context!.fill(outlinedImageRect)
    image.draw(in: imageRect)

    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage!

}

You can change outline size by changingnewImageKoef.

The answer is based on haawa answer and update to swift 3.0.