带有NSAttributedString的可调标签

Question

我正在尝试创建一个UILabel，其中某些单词加下划线并点击它们会触发一个事件。为此，我按照此链接中的最佳答案，但我将其翻译为Swift：Create tap-able "links" in the NSAttributedString of a UILabel?

这是我的代码：

let disclaimerLabel : TTTAttributedLabel = {
    let label = TTTAttributedLabel(frame: CGRectZero)
    label.textColor =  UIColor.whiteColor()
    label.font = UIFont.boldSystemFontOfSize(13)
    label.textAlignment = .Center
    label.numberOfLines = 2
    label.adjustsFontSizeToFitWidth = true
    return label
}()

//Inside viewDidLoad

let attString : NSMutableAttributedString = NSMutableAttributedString(string: "By logging in, you agree to our Privacy Policy and Terms and Conditions.")
    let attributes : NSDictionary = [NSForegroundColorAttributeName : UIColor(red: (0.05), green: (0.4), blue: (0.65), alpha: 1.0), NSUnderlineStyleAttributeName : NSUnderlineStyle.StyleSingle.rawValue]
    attString.setAttributes([NSForegroundColorAttributeName : UIColor.whiteColor()], range: NSMakeRange(0,72))
    attString.setAttributes(attributes as? [String : AnyObject], range: NSMakeRange(31, 15))
    attString.setAttributes(attributes as? [String : AnyObject], range: NSMakeRange(50, 21))
    disclaimerLabel.setText(attString)

    disclaimerLabel.userInteractionEnabled = true
    disclaimerLabel.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleLabelTap)))

    layoutManager = NSLayoutManager()
    textContainer = NSTextContainer(size: CGSizeZero)
    textStorage = NSTextStorage(attributedString: attString)

    layoutManager?.addTextContainer(textContainer!)
    textStorage?.addLayoutManager(layoutManager!)

    textContainer!.lineFragmentPadding = 0.0
    textContainer!.lineBreakMode = disclaimerLabel.lineBreakMode
    textContainer!.maximumNumberOfLines = disclaimerLabel.numberOfLines


}

func handleLabelTap(tapGesture : UITapGestureRecognizer) {
    let locationInLabel : CGPoint = tapGesture.locationInView(tapGesture.view)
    let labelSize : CGSize = tapGesture.view!.bounds.size
    let textBoundingBox : CGRect = (self.layoutManager?.usedRectForTextContainer(self.textContainer!))!
    let textContainerOffset : CGPoint = CGPointMake((labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x, (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y)
    let locationOfTouchInTextContainer : CGPoint = CGPointMake(locationInLabel.x - textContainerOffset.x, locationInLabel.y - textContainerOffset.y)
    let indexOfChar : NSInteger = (self.layoutManager?.characterIndexForPoint(locationOfTouchInTextContainer, inTextContainer: self.textContainer!, fractionOfDistanceBetweenInsertionPoints: nil))!
    let rangeForPrivacy = NSMakeRange(31, 15)
    let rangeForTerms = NSMakeRange(50, 21)

    if (NSLocationInRange(indexOfChar, rangeForPrivacy)) {
        print("privacy tapped")
        self.performSegueWithIdentifier("showPrivacyPolicy", sender: self)
    }
    else if (NSLocationInRange(indexOfChar, rangeForTerms)) {
        print("terms tapped")
    }
}

标签的第一行一切正常，所有点击都按预期识别，但点击标签的第二行（“和条件”）不会触发任何事件。