o zaman textView delegate metodlarından biri olan shouldInteractWithURL kullanılarak aşağıdaki örnekte verdiğim gibi birşeyler yapabilirsiniz mesela.
import UIKit
class ViewController: UIViewController, UITextViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myString:String = "asdasdasd asd asdasd asda sdasdasd asdasd asdasd www.asd.com asdasd asdasd www.sdf.com"
        
        let mainAttributedString:NSMutableAttributedString = NSMutableAttributedString()
        let textFont:UIFont = UIFont(name: "Avenir-Heavy", size: 20)!
        let textParagraphStyle:NSMutableParagraphStyle = NSMutableParagraphStyle()
        textParagraphStyle.alignment = NSTextAlignment.Center
        let textAttributeDict = [NSFontAttributeName:textFont, NSForegroundColorAttributeName:UIColor.blackColor(), NSParagraphStyleAttributeName:textParagraphStyle]
        let textAttributedString:NSMutableAttributedString = NSMutableAttributedString(string: myString, attributes: textAttributeDict)
        mainAttributedString.appendAttributedString(textAttributedString)
        let hyperTextAttributeDict = [NSFontAttributeName:textFont, NSForegroundColorAttributeName:UIColor.redColor(), NSParagraphStyleAttributeName:textParagraphStyle]
        var textView = UITextView(frame: self.view.frame)
        textView.delegate = self
        textView.linkTextAttributes = hyperTextAttributeDict
        textView.dataDetectorTypes = UIDataDetectorTypes.Link
        textView.backgroundColor = UIColor.clearColor()
        textView.font = textFont
        textView.textColor = UIColor.blackColor()
        textView.textAlignment = NSTextAlignment.Justified
        textView.editable = false
        textView.userInteractionEnabled = true
        textView.selectable = true
        textView.scrollEnabled = true
        textView.scrollsToTop = true
        textView.attributedText = mainAttributedString
        self.view.addSubview(textView)
    }
    
    
    func textView(textView: UITextView, shouldInteractWithURL URL: NSURL, inRange characterRange: NSRange) -> Bool {
        let textViewString:NSString = textView.text as NSString
        let rangedString:String = textViewString.substringWithRange(characterRange)
            if rangedString == "www.sdf.com" {
                println("do something else")
                return false
            }
        return true
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}