100 lines
3.4 KiB
Swift
100 lines
3.4 KiB
Swift
import UIKit
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// Requirements:
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// • Links should show up properly and be tappable.
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// • Text should * not * be selectable.
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// • The long press interaction that shows the context menu should still work.
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// See https://stackoverflow.com/questions/47983838/how-can-you-change-the-color-of-links-in-a-uilabel
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public protocol TappableLabelDelegate: AnyObject {
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func tapableLabel(_ label: TappableLabel, didTapUrl url: String, atRange range: NSRange)
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}
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public class TappableLabel: UILabel {
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private var links: [String: NSRange] = [:]
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private(set) var layoutManager = NSLayoutManager()
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private(set) var textContainer = NSTextContainer(size: CGSize.zero)
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private(set) var textStorage = NSTextStorage() {
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didSet {
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textStorage.addLayoutManager(layoutManager)
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}
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}
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public weak var delegate: TappableLabelDelegate?
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public override var attributedText: NSAttributedString? {
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didSet {
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if let attributedText = attributedText {
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textStorage = NSTextStorage(attributedString: attributedText)
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findLinksAndRange(attributeString: attributedText)
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} else {
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textStorage = NSTextStorage()
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links = [:]
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}
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}
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}
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public override var lineBreakMode: NSLineBreakMode {
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didSet {
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textContainer.lineBreakMode = lineBreakMode
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}
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}
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public override var numberOfLines: Int {
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didSet {
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textContainer.maximumNumberOfLines = numberOfLines
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}
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}
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public override init(frame: CGRect) {
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super.init(frame: frame)
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setup()
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}
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public required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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setup()
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}
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private func setup() {
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isUserInteractionEnabled = true
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layoutManager.addTextContainer(textContainer)
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textContainer.lineFragmentPadding = 0
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textContainer.lineBreakMode = lineBreakMode
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textContainer.maximumNumberOfLines = numberOfLines
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numberOfLines = 0
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}
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public override func layoutSubviews() {
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super.layoutSubviews()
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textContainer.size = bounds.size
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}
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private func findLinksAndRange(attributeString: NSAttributedString) {
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links = [:]
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let enumerationBlock: (Any?, NSRange, UnsafeMutablePointer<ObjCBool>) -> Void = { [weak self] value, range, isStop in
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guard let strongSelf = self else { return }
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if let value = value {
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let stringValue = "\(value)"
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strongSelf.links[stringValue] = range
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}
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}
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attributeString.enumerateAttribute(.link, in: NSRange(0..<attributeString.length), options: [.longestEffectiveRangeNotRequired], using: enumerationBlock)
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attributeString.enumerateAttribute(.attachment, in: NSRange(0..<attributeString.length), options: [.longestEffectiveRangeNotRequired], using: enumerationBlock)
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}
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public override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
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guard let locationOfTouch = touches.first?.location(in: self) else {
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return
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}
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textContainer.size = bounds.size
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let indexOfCharacter = layoutManager.glyphIndex(for: locationOfTouch, in: textContainer)
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for (urlString, range) in links where NSLocationInRange(indexOfCharacter, range) {
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delegate?.tapableLabel(self, didTapUrl: urlString, atRange: range)
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return
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}
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}
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}
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