显示以编程方式创建的 UITextView/UITextField 的剪切/复制/粘贴菜单

Question

I cannot seem to get the default behaviour when creating a UITextView or a UITextField programmatically compared to coming from the Storyboard.

I instantiate the text view in the view controller as a property like this:

lazy var descriptionTextView: UITextView = {
       let tv = UITextView(frame: .zero)
        tv.font = UIFont.systemFont(ofSize: UIFont.systemFontSize)
        tv.clipsToBounds = true
        tv.layer.cornerRadius = 5.0
        tv.layer.borderWidth = 0.25
        tv.translatesAutoresizingMaskIntoConstraints = false
        return tv
    }()

In loadView I add it to the view and configure auto layout. It displays correctly, so that's not the issue.

My problem is, that when selecting text within that text view, I expect the following menu being displayed (screenshot taken from a storyboard project):

What I do see though is just the menu bar showing correction proposals if single words are selected or even nothing at all when several words are selected. How can I obtain the same behaviour in my programmatic approach?

Edit:

Here's how I add the textview to the view (simplified, there are other views that I omitted here):

override func loadView() {
        view = UIView()
        view.backgroundColor = .white

        view.addSubview(descriptionTextView)

        NSLayoutConstraint.activate([            
            descriptionTextView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 12),
            descriptionTextView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 24),
            descriptionTextView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -24),
            descriptionTextView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -12)
        ])
}

When I select a single word within the textfield, I only get correction suggestions:

When I select more than one word, the menu is not popping up at all:

Answer 1

Try this example:

@objc func longPressEventHandler(sender: UILongPressGestureRecognizer) {
    guard sender.state == .began,
        let senderView = sender.view,
        let superView = sender.view?.superview
        else { return }

    // Make responsiveView the window's first responder
    senderView.becomeFirstResponder()

    // Set up the shared UIMenuController
    let cutMenuItem = UIMenuItem(title: "Cut", action: #selector(cutTapped))
    let copyMenuItem = UIMenuItem(title: "Copy", action: #selector(copyTapped))
    UIMenuController.shared.menuItems = [cutMenuItem, copyMenuItem]

    // Tell the menu controller the first responder's frame and its super view
    UIMenuController.shared.setTargetRect(senderView.frame, in: superView)

    // Animate the menu onto view
    UIMenuController.shared.setMenuVisible(true, animated: true)
}

Answer 2

Turns out that I introduced the problem by implementing scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) incorrectly:

actually I called makeKeyAndVisible() before setting window?.windowScene = windowScene .

Seems like the standard cut / copy / paste menu is contained in that property...

So, to clarify, here's willConnectTo with the mistake...:

guard let windowScene = (scene as? UIWindowScene) else { return }

window = UIWindow(frame: UIScreen.main.bounds)

let mainViewController = ProjectTableViewController()

let navigationController = UINavigationController()
navigationController.setViewControllers([mainViewController], animated: false)

window?.rootViewController = navigationController
window?.makeKeyAndVisible()
window?.windowScene = windowScene //that's too late... :-(

...and here's the working code:

guard let windowScene = (scene as? UIWindowScene) else { return }

window = UIWindow(frame: UIScreen.main.bounds)

let mainViewController = ProjectTableViewController()

let navigationController = UINavigationController()
navigationController.setViewControllers([mainViewController], animated: false)

window?.rootViewController = navigationController
window?.windowScene = windowScene //that's better :-)
window?.makeKeyAndVisible()

I know: what a stupid mistake to make – I hope my answer can help anyone else who runs into this...