Question

我在UITextView上遇到两个问题。我有一个UIViewController，其中有5个UITextField。 UITextField1和UITextField2始终可见，用户无法隐藏。如果用户点击按钮，则会添加（isHidden属性设置为false），最多增加3个UITextFields。

这些UITextFields中的每一个都应将显示左侧字符的自定义.rightView显示为UILabel。除此之外，另外3个UITextFields还应添加.rightView作为UIButton的{{1}}动画，使其应动画化textField.isHidden = true，以使它产生删除的错觉UITextField。

问题

右视图的删除UIButton不起作用（即不隐藏相应的UITextField，我不确定为什么。现在，当您点击删除UIButton时，它会隐藏按钮本身，这很奇怪

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    guard let text = textField.text else { return true }
    let newLength = text.count + string.count - range.length

    let rightView = UIView(frame: CGRect(x: 0, y: 0, width: 55, height: 25))
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
    label.font = UIFont(name: Fonts.OpenSans_Light, size: 14)

    if textField === thirdChoiceTextField || textField === forthChoiceTextField || textField === fifthChoiceTextField {
        let button = UIButton(frame: CGRect(x: rightView.frame.width - 30, y: 0, width: 25, height: 25))
        button.setBackgroundImage(UIImage(named: "icon_cancel_dark"), for: .normal)
        button.addTarget(self, action: #selector(self.hideTextField(textField:)), for: .touchUpInside)
        rightView.addSubview(button)
    }

    rightView.addSubview(label)
    textField.rightView = rightView
    textField.rightViewMode = .whileEditing
    label.textAlignment = .center

    if newLength <= 35 {
        label.text =  String(50 - newLength)
        label.textColor = .lightGray
    }
    else {
        label.text =  String(50 - newLength)
        label.textColor = UIColor.red
    }

    return newLength < 50
}


@objc func hideTextField(textField: UITextField) {
    if !textField.isHidden {
        UIView.animate(withDuration: 0.2) {
            textField.isHidden = true
        }
    }
}

Answer 1

在func hideTextField(textField: UITextField)方法中，参数不应为UITextField，而应为UIButton本身，如下所示，

@objc func hideTextField(_ sender: UIButton) {
    ...
}

和下面一行

button.addTarget(self, action: #selector(self.hideTextField(textField:)), for: .touchUpInside)

将更改为

button.addTarget(self, action: #selector(self.hideTextField(_:)), for: .touchUpInside)

现在您可以按如下所示应用动画

@objc func hideTextField(_ sender: UIButton) {
    if let  field = sender.superview?.superview as? UITextField, !field.isHidden {
        UIView.animate(withDuration: 0.2) {
            field.isHidden = true
        }
    }
 }

UITextField rightView图片和按钮？

1 个答案: