handyExtensions.swift

extension String {
//Convert html strings to an attributed string
    var html2AttributedString: NSMutableAttributedString? {
        guard
            let data = dataUsingEncoding(NSUTF8StringEncoding)
            else { return nil }
        do {
            let attrStr = try NSMutableAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute:NSUTF8StringEncoding], documentAttributes: nil)
            attrStr.addAttributes([NSFontAttributeName: UIFont.systemFontOfSize(17.0)], range: NSRange(location: 0, length: attrStr.length))
            return attrStr
        } catch let error as NSError {
            print(error.localizedDescription)
            return  nil
        }
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

extension UIViewController{
    //Add acitivityView in center of view
    func addLoader(activity_view: UIActivityIndicatorView){
        activity_view.frame =  CGRectMake(0.0, 0.0, 40.0,40.0)
        activity_view.center = self.view.center
        self.view.addSubview(activity_view)
        activity_view.startAnimating()

    }
}