当我单击 TextField 时,当我创建 UIExfield 的子类以隐藏复制/过去等按钮时,我遇到了问题。这是该类的代码:
class UITextFieldCustom: UITextField {
var enableLongPressActions = false
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!}
override init(frame: CGRect) {
super.init(frame: frame)}
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
return enableLongPressActions
}
}
当我将它用于故事板中的 texfield 时,代码运行良好,但是当以编程方式制作 textField 时,我收到消息:线程 1:信号 SIGABRT
这是我的文本字段在我的视图控制器扩展中的一部分代码上的声明:
extension MenuViewController {
func tabBarCentre(nameTextField: UITextFieldCustom) {
let titleLeftbutton = UIButton(type: .system)
titleLeftbutton.tintColor = #colorLiteral(red: 0.370555222, green: 0.3705646992, blue: 0.3705595732, alpha: 1)
let leftButtonConfig = UIImage.SymbolConfiguration(
pointSize: 20,
weight: .bold,
scale: .small)
let leftButtonImage = UIImage(
systemName: "chevron.left",
withConfiguration: leftButtonConfig)
titleLeftbutton.setImage(leftButtonImage, for: .normal)
titleLeftbutton.addTarget(self, action: #selector(dateMoinsUn), for: .touchUpInside)
// Création du text central qui recevra le DatePicker
nameTextField.frame = CGRect(x: 0, y: 0, width: 70, height: 25)
nameTextField.backgroundColor = #colorLiteral(red: 0.9685223699, green: 0.9686879516, blue: 0.9685119987, alpha: 1)
nameTextField.placeholder = "Ajouter date"
nameTextField.font = nameTextField.font?.withSize(15)
nameTextField.font = UIFont.preferredFont(forTextStyle: .headline)
nameTextField.textAlignment = .center
错误消息在我的 viewController 中:
class MenuViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tabBarCentre(nameTextField: titleNavBarTextField) // THE ERROR IS HERE !!!!
self.titleNavBarTextField.setInputViewDatePicker(target: self, textField: titleNavBarTextField, selector1: #selector(tapped), selector2: #selector(todayPressed))
titleNavBarTextField.text = displayToday()
}
}
谢谢。
将此方法添加到您的代码中并查看更改。您还可以自定义您可以对文本字段执行的操作。如果您希望禁用所有文本字段操作,则只需在 func canPerformAction 方法中“返回 false”即可。
override func caretRect(for position: UITextPosition) -> CGRect {
return CGRect.zero
}
override func selectionRects(for range: UITextRange) -> [UITextSelectionRect] {
return []
}
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == #selector(UIResponderStandardEditActions.cut(_:)) || action == #selector(UIResponderStandardEditActions.selectAll(_:)) || action == #selector(UIResponderStandardEditActions.paste(_:)) {
return false
}
// Default
return super.canPerformAction(action, withSender: sender)**
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我来说两句