快速查看如何隐藏光标并以编程方式禁用UITextfield的剪切/粘贴

编程问答 2022-08-14

问题描述

当我单击TextField时，当创建UITexfield的子类以隐藏复制/粘贴等按钮时，我面临一个问题。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
    }

}

当我从情节提要中将其用于texfield时，代码运行良好，但是当将textField设置为编程方式时，我会收到以下消息：线程1：信号SIGABRT

这是我的View Controller扩展中部分代码中的textField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。

解决方法

将此方法添加到代码中，然后查看更改。您还可以自定义对文本字段的处理方式。如果要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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