[英]Disable cut, copy, paste on UITextField using IBInspectable
[英]Display cut / copy / paste menu for UITextView / UITextField created programmatically
與來自 Storyboard 相比,以編程方式創建 UITextView 或 UITextField 時,我似乎無法獲得默認行為。
我將視圖控制器中的文本視圖實例化為這樣的屬性:
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
}()
在loadView
我將其添加到視圖並配置自動布局。 它顯示正確,所以這不是問題。
我的問題是,在該文本視圖中選擇文本時,我希望顯示以下菜單(從故事板項目中截取的屏幕截圖):
我所看到的只是菜單欄顯示更正建議,如果選擇了單個單詞,或者在選擇多個單詞時甚至什么都不顯示。 如何在我的程序化方法中獲得相同的行為?
編輯:
下面是我將 textview 添加到視圖的方法(簡化了,我在這里省略了其他視圖):
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)
])
}
當我在文本字段中選擇一個單詞時,我只會得到更正建議:
當我選擇多個單詞時,菜單根本沒有彈出:
試試這個例子:
@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)
}
原來我是通過錯誤地實現scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions)
引入問題的:
實際上我在設置window?.windowScene = windowScene
之前調用了makeKeyAndVisible()
。
似乎標准剪切/復制/粘貼菜單包含在該屬性中...
因此,要澄清一下,這里的willConnectTo
與錯誤...:
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... :-(
...這是工作代碼:
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()
我知道:犯了多么愚蠢的錯誤-我希望我的回答可以幫助遇到此問題的任何其他人...
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