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June 20, 2020 11:42
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An UILabel subclass which allows you to show the "copy" MenuController item to copy its content to the pasteboard
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import UIKit | |
class CopyLabel : UILabel { | |
// MARK: Setup | |
override init(frame: CGRect) { | |
super.init(frame: frame) | |
configureMenu() | |
} | |
required init?(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder) | |
configureMenu() | |
} | |
private func configureMenu() { | |
self.isUserInteractionEnabled = true | |
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(showMenu(_:))) | |
self.addGestureRecognizer(gestureRecognizer) | |
NotificationCenter.default.addObserver(self, selector: #selector(onHideMenu(_:)), name: UIMenuController.didHideMenuNotification, object: nil) | |
} | |
// MARK: UIResponder | |
override var canBecomeFirstResponder: Bool { | |
return true | |
} | |
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool { | |
return action == #selector(copy(_:)) | |
} | |
override func copy(_ sender: Any?) { | |
UIPasteboard.general.string = text | |
} | |
// MARK: UIMenuController | |
@objc | |
private func showMenu(_ recognizer: UIGestureRecognizer) { | |
guard let superView = self.superview else { return } | |
self.becomeFirstResponder() | |
self.setSelectionFeedback(selected: true) | |
let menuController = UIMenuController.shared | |
menuController.setTargetRect(self.frame, in: superView) | |
menuController.setMenuVisible(true, animated: true) | |
} | |
@objc | |
private func onHideMenu(_ notification: NSNotification) { | |
self.setSelectionFeedback(selected: false) | |
} | |
private func setSelectionFeedback(selected: Bool) { | |
guard let attrStr = self.attributedText else { return } | |
let mut = NSMutableAttributedString(attributedString: attrStr) | |
let str = attrStr.string | |
let range = NSRange(str.startIndex..<str.endIndex, in: str) | |
if selected { | |
let selectionColor = UIColor(red: 0.7, green: 0.7, blue: 1.0, alpha: 0.8) | |
mut.addAttribute(.backgroundColor, value: selectionColor, range: range) | |
} else { | |
mut.removeAttribute(.backgroundColor, range: range) | |
} | |
self.attributedText = mut | |
} | |
} | |
class DemoViewController: UIViewController { | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
self.view.backgroundColor = .white | |
let frame = CGRect(x: 20, y: 350, width: 335, height: 40) | |
let label = CopyLabel(frame: frame) | |
label.backgroundColor = UIColor(white: 0.9, alpha: 1.0) | |
label.text = "https://alisoftware.github.io/" | |
label.textAlignment = .center | |
self.view.addSubview(label) | |
} | |
} |
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