不再隐藏 UITextField 后禁用 UIButton？

Question

我有一个简单的任务，但我似乎无法弄清楚。我有一个 UIViewController 有 5 UITextFields。其中 2 个 UITextFields 始终可见。当用户点击 UIButton 时会显示其他 3 个。我的目标是禁用 UIButton，这样用户就可以清楚地看到，在所有 UITextFields 都可见之后，他们不能 "add" 更多 UITextFields。我试着这样做：

@IBAction func addTextFieldPressed(_ sender: UIButton) {
    if !thirdChoiceTextField.isHidden, !forthChoiceTextField.isHidden, !fifthChoiceTextField.isHidden {
        addTextFieldButton.isEnabled = false
    }
        if thirdChoiceTextField.isHidden {
            UIView.animate(withDuration: 0.2) {
                self.thirdChoiceTextField.isHidden = false
            }
        }
        else if forthChoiceTextField.isHidden {
            UIView.animate(withDuration: 0.2) {
                self.forthChoiceTextField.isHidden = false
            }
        }
        else {
            UIView.animate(withDuration: 0.2) {
                self.fifthChoiceTextField.isHidden = false

        }
    }
}

但是没用。您可以添加 UITextFields。还有一个 UIButton 允许用户删除添加的 3 个 UITextField。因此，我必须确保如果显示所有文本字段，则负责添加更多 UITextFields 的 UIButton 将被禁用，但如果任何 UITextFields 被删除（.isHidden = true)，该按钮应该再次启用。

更新： 这是在用户点击 "hide" 按钮后运行的代码，它基本上隐藏了第 3、4 或 5 UITextField

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

Answer 1

缺少 else 条件。

@IBAction func addTextFieldPressed(_ sender: UIButton) {
    if !thirdChoiceTextField.isHidden, !forthChoiceTextField.isHidden, !fifthChoiceTextField.isHidden {
        addTextFieldButton.isEnabled = false
    }
    else{
        addTextFieldButton.isEnabled = true
    }
    if thirdChoiceTextField.isHidden {
        UIView.animate(withDuration: 0.2) {
            self.thirdChoiceTextField.isHidden = false
        }
    }
    else if forthChoiceTextField.isHidden {
        UIView.animate(withDuration: 0.2) {
            self.forthChoiceTextField.isHidden = false
        }
    }
    else {
        UIView.animate(withDuration: 0.2) {
            self.fifthChoiceTextField.isHidden = false

    }
  }
}

更新（尝试添加这个以启用按钮）

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

    if !thirdChoiceTextField.isHidden, !forthChoiceTextField.isHidden, !fifthChoiceTextField.isHidden {
        addTextFieldButton.isEnabled = false
    }
    else{
        addTextFieldButton.isEnabled = true
    }

}

不再隐藏 UITextField 后禁用 UIButton？

Disable UIButton after UITextField is no longer hidden?

uibutton

uitextfield

ios

swift