ios - 自定义单元格中的焦点 UITextfield

Question

我在自定义单元格中有 2 个 UITextfield。现在我想在从其他 View 推送时将焦点放在第一个文本字段上。

这是我在 cellForRowAt 委托(delegate)中的代码，但这不起作用:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
 let userCell = tableView.dequeueReusableCell(withIdentifier: "InputUserInfoForm") as! InputUserInfoForm
        userCell.selectionStyle = .none

        userCell.fistnameTextField.autocorrectionType = .no
        userCell.lastnameTextField.autocorrectionType = .no

        // Firstname textfield
        userCell.fistnameTextField.tag = RegisterForm.Firstname.rawValue
        userCell.firstnameLabel.text = "FirstnameTitle".localized()
        userCell.firstnameLabel.becomeFirstResponder()

        // Lastname textfield
        userCell.lastnameTextField.tag = RegisterForm.Lastname.rawValue
        userCell.lastnameLabel.text = "LastnameTitle".localized()

        return userCell
}

Answer 1

问题是，您有多个单元格，并且每次绘制时都会指示所有单元格 becomeFirstResponder。

如果您只想在显示表格时将焦点设置在第一个单元格上，并且只有在那时，您可以在 indexPath.row == 0 时标记 UITextField在 viewDidAppear 中，您只需获取带有标签的字段并设置 becomeFirstResponder

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
 let userCell = tableView.dequeueReusableCell(withIdentifier: "InputUserInfoForm") as! InputUserInfoForm
    userCell.selectionStyle = .none

    userCell.fistnameTextField.autocorrectionType = .no
    userCell.lastnameTextField.autocorrectionType = .no

    // Firstname textfield
    userCell.fistnameTextField.tag = RegisterForm.Firstname.rawValue
    userCell.firstnameLabel.text = "FirstnameTitle".localized()
    if indexPath.row == 0 {
        userCell.firstnameLabel.tag = 123
    }

    // Lastname textfield
    userCell.lastnameTextField.tag = RegisterForm.Lastname.rawValue
    userCell.lastnameLabel.text = "LastnameTitle".localized()

    return userCell
}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    self.view.viewWithTag(123)
}