Question

我有2个textFields和1个textView，所有这些字段都有一个内容，来自previousViewController，如果新内容与以下内容不同，我需要根据用户在这些字段中的更改启用或禁用rightBarButtonItem当前内容，来自previousViewController。如何同时检查textFields和textView？现在我有了（条件有时彼此矛盾）

在viewDidLoad中：

loginTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

displayNameTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

然后：

@objc func textFieldDidChange(_ textField: UITextField) {

    if displayNameTextField.text != currentDisplayName || loginTextField.text != currentUsername {
        self.navigationItem.rightBarButtonItem?.isEnabled = true
    } else {
        self.navigationItem.rightBarButtonItem?.isEnabled = false
    }

}

func textViewDidChangeSelection(_ textView: UITextView) {
    if aboutTextView.text == currentAbout {
        self.navigationItem.rightBarButtonItem?.isEnabled = false
    } else {
        self.navigationItem.rightBarButtonItem?.isEnabled = true
    }
}

Answer 1

为什么不将其提取到函数中并像这样检查它：

@objc func textFieldDidChange(_ textField: UITextField) {
    validateFields()
}

func textViewDidChangeSelection(_ textView: UITextView) {
    validateFields()
}

func validateFields() {
    if aboutTextView.text == currentAbout || displayNameTextField.text == currentDisplayName || loginTextField.text == currentUsername {
        self.navigationItem.rightBarButtonItem?.isEnabled = false
    } else {
        self.navigationItem.rightBarButtonItem?.isEnabled = true
    }
}

如何同时检查textField和textView中的相同条件？

1 个答案: