UIButton with centered Image and Text

UIButton+Extension.swift

// with the help of: https://gist.github.com/phpmaple/9458264

extension UIButton {
    func centerImageAndButton(_ gap: CGFloat, imageOnTop: Bool) {
        
        guard let imageView = self.imageView,
            let titleLabel = self.titleLabel else { return }
        
        let sign: CGFloat = imageOnTop ? 1 : -1;
        let imageSize = imageView.frame.size;
        self.titleEdgeInsets = UIEdgeInsetsMake((imageSize.height+gap)*sign, -imageSize.width, 0, 0);
        
        let titleSize = titleLabel.bounds.size;
        self.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height+gap)*sign, 0, 0, -titleSize.width);
    }
}