70 lines
2.7 KiB
Swift
70 lines
2.7 KiB
Swift
//
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// Copyright 2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import SafariServices
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import SignalServiceKit
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public class LinkingTextView: UITextView {
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public override init(frame: CGRect, textContainer: NSTextContainer?) {
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super.init(frame: frame, textContainer: textContainer)
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backgroundColor = .clear
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isOpaque = false
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isEditable = false
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textContainerInset = .zero
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contentInset = .zero
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self.textContainer.lineFragmentPadding = 0
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isScrollEnabled = false
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delegate = self
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// required to prevent blue background selection from any situation
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override public var selectedTextRange: UITextRange? {
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get { return nil }
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set {}
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}
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// disables unwanted UIGestureRecognizer from UITextView
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// to prevent selection, magnification, etc. while still
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// allowing links to be interactable.
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// https://stackoverflow.com/a/49428307/1033581
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override public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
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if gestureRecognizer is UIPanGestureRecognizer {
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// required for compatibility with isScrollEnabled
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return super.gestureRecognizerShouldBegin(gestureRecognizer)
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}
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if let tapGestureRecognizer = gestureRecognizer as? UITapGestureRecognizer,
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tapGestureRecognizer.numberOfTapsRequired == 1 {
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// required for compatibility with links
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return super.gestureRecognizerShouldBegin(gestureRecognizer)
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}
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// allowing smallDelayRecognizer for links
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// https://stackoverflow.com/questions/46143868/xcode-9-uitextview-links-no-longer-clickable
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if let longPressGestureRecognizer = gestureRecognizer as? UILongPressGestureRecognizer,
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// comparison value is used to distinguish between 0.12 (smallDelayRecognizer) and 0.5 (textSelectionForce and textLoupe)
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longPressGestureRecognizer.minimumPressDuration < 0.325 {
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return super.gestureRecognizerShouldBegin(gestureRecognizer)
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}
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// preventing selection from loupe/magnifier (_UITextSelectionForceGesture), multi tap, tap and a half, etc.
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gestureRecognizer.isEnabled = false
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return false
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}
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}
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extension LinkingTextView: UITextViewDelegate {
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public func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
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let vc = SFSafariViewController(url: URL)
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CurrentAppContext().frontmostViewController()?.present(vc, animated: true, completion: nil)
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return false
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}
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}
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