101 lines
3.3 KiB
Swift
101 lines
3.3 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import UIKit
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final class TouchFallthroughTextView: UITextView {
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var shouldFallthrough: Bool = true
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override init(frame: CGRect, textContainer: NSTextContainer?) {
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super.init(frame: frame, textContainer: textContainer)
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initializationActions()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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initializationActions()
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}
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override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
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shouldFallthrough ? urlAndRect(at: point) != nil : super.point(inside: point, with: event)
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}
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override var selectedTextRange: UITextRange? {
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get { shouldFallthrough ? nil : super.selectedTextRange }
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set {
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if !shouldFallthrough {
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super.selectedTextRange = newValue
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}
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}
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}
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override var intrinsicContentSize: CGSize {
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return text == "" ? .zero : super.intrinsicContentSize
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}
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func urlAndRect(at point: CGPoint) -> (URL, CGRect)? {
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guard
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let pos = closestPosition(to: point),
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let range = tokenizer.rangeEnclosingPosition(
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pos, with: .character,
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inDirection: UITextDirection.layout(.left))
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else { return nil }
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let urlAtPointIndex = offset(from: beginningOfDocument, to: range.start)
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guard let url = attributedText.attribute(
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.link, at: offset(from: beginningOfDocument, to: range.start),
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effectiveRange: nil) as? URL
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else { return nil }
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let maxLength = attributedText.length
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var min = urlAtPointIndex
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var max = urlAtPointIndex
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attributedText.enumerateAttribute(
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.link,
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in: NSRange(location: 0, length: urlAtPointIndex),
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options: .reverse) { attribute, range, stop in
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if let attributeURL = attribute as? URL, attributeURL == url, min > 0 {
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min = range.location
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} else {
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stop.pointee = true
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}
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}
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attributedText.enumerateAttribute(
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.link,
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in: NSRange(location: urlAtPointIndex, length: maxLength - urlAtPointIndex),
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options: []) { attribute, range, stop in
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if let attributeURL = attribute as? URL, attributeURL == url, max < maxLength {
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max = range.location + range.length
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} else {
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stop.pointee = true
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}
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}
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var urlRect = CGRect.zero
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layoutManager.enumerateEnclosingRects(
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forGlyphRange: NSRange(location: min, length: max - min),
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withinSelectedGlyphRange: NSRange(location: NSNotFound, length: 0),
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in: textContainer) { rect, _ in
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if urlRect.origin == .zero {
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urlRect.origin = rect.origin
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}
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urlRect = urlRect.union(rect)
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}
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return (url, urlRect)
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}
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}
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private extension TouchFallthroughTextView {
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private func initializationActions() {
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textDragInteraction?.isEnabled = false
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textContainerInset = .zero
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textContainer.lineFragmentPadding = 0
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linkTextAttributes = [.foregroundColor: tintColor as Any, .underlineColor: UIColor.clear]
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}
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}
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