Second link not accessible when VoiceOver is enabled.

[nservidio]

iPhone 12 mini
iOS 15.2.1

Steps to repro:

1. Configure a TTTAttributedLabel with an NSAttributedString.
2. Add 2 links to the text.
3. Make sure the font of the attributed string wraps the text onto a second line.
4. Enable VoiceOver.

Expected: Both links are accessible via VoiceOver.
Actual: Only the first link is accessible via VoiceOver.

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To test you can create a single view app with a Storyboard and replace the ViewController code with the following:

Code snippet

import UIKit
import TTTAttributedLabel
import PureLayout

class ViewController: UIViewController, TTTAttributedLabelDelegate {

    let labelText = "I have read and understand Foo's Privacy Policy. I accept the Foo Terms of Use."
    let privacyPolicyLinkText = "Privacy Policy"
    let privacyPolicyLinkURL = URL(string: "https://www.privacy.com")!
    let termsLinkText = "Terms of Use"
    let termsLinkURL = URL(string: "https://www.terms.com")!

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white

        let label = TTTAttributedLabel(forAutoLayout: ())
        label.numberOfLines = 0
        label.delegate = self

        view.addSubview(label)
        label.autoAlignAxis(toSuperviewAxis: .horizontal)
        label.autoPinEdge(toSuperviewEdge: .leading, withInset: 20)
        label.autoPinEdge(toSuperviewEdge: .trailing, withInset: 20)

        let attributedString = NSAttributedString(string: labelText,
                                                  attributes: [
                                                    NSAttributedString.Key.font: UIFont.systemFont(ofSize: 16)])

        label.setText(attributedString)
        label.addLink(to: privacyPolicyLinkURL, with: (labelText as NSString).range(of: privacyPolicyLinkText))
        label.addLink(to: termsLinkURL, with: (labelText as NSString).range(of: termsLinkText))
    }

    func attributedLabel(_ label: TTTAttributedLabel!, didSelectLinkWith url: URL!) {
        let alert = UIAlertController(title: "Alert",
                                      message: "Tapped link: \(url.absoluteString)",
                                      preferredStyle: .alert)
        let action = UIAlertAction(title: "Ok", style: .default, handler: nil)
        alert.addAction(action)
        present(alert, animated: true, completion: nil)
    }
}

Here is the Podfile being used. I used PureLayout in addition to TTTAttributedLabel.

Podfile

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'AttributedLabelLinkBug' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  pod 'TTTAttributedLabel'
  pod 'PureLayout'

  target 'AttributedLabelLinkBugTests' do
    inherit! :search_paths
    # Pods for testing
  end

  target 'AttributedLabelLinkBugUITests' do
    # Pods for testing
  end

end

Here is a video of the issue:
https://user-images.githubusercontent.com/7491869/151636127-948eec72-c3a4-4452-b698-c1815e6c6bec.mp4

Notice how the links are clickable when VO is not enabled.

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The technical issue seems to be in the boundingRectForCharacterRange method. boundingRectForGlyphRange does not return the correct CGRect for the second link.