ios - 从 UITableViewCell 中的 UITextField 访问文本

Question

我正在实现一个 UITableViewController，它有 3 个部分，前两个部分分别包含 2 个和 1 个文本字段。我在访问文本字段中的文本输入时遇到问题。我不知道如何在 iOS swift 中解决这个问题，请帮忙。

在 TableView Controller 中

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let gender = Gender(rawValue: indexPath.row)

        switch indexPath.section {
        case 0:
            guard let nameCell = tableView.dequeueReusableCellWithIdentifier("addNameCellID") as? ChildFormViewCell else {
                return UITableViewCell()
            }
            nameCell.firstNameField.text = "" // just in case cells are re-used, this clears the old value
            nameCell.firstNameField.tag = indexPath.row
            return nameCell

        case 1:
            self.tableView.rowHeight = 50
            guard let dateCell = tableView.dequeueReusableCellWithIdentifier("addDateCellID") as? ChildFormViewCell else {
                return UITableViewCell()
            }
            return dateCell

        case 2:
            guard let genderCell = tableView.dequeueReusableCellWithIdentifier("addGenderCellID") as? ChildFormViewCell else {
                return UITableViewCell()
            }
            genderCell.genderLabel.text = gender?.nameString()
            return genderCell

        default:
        return UITableViewCell()
        }
    }

extension AddChildFormTVC: ChildFormViewCellDelegate {
    func getFirstName(text: String?) {
        print(text)
    }
    func getLastName(text: String?) {
        print(text)
    }
    func getDateOfBirth(text: String?) {
        print(text)
    }
    func getGender(text: String?) {
        print(text)
    }

}

<小时/>

class ChildFormViewCell: UITableViewCell {

    @IBOutlet weak var firstNameField: UITextField!
    @IBOutlet var lastNameField: UITextField!
    @IBOutlet var dateField: UITextField!
    @IBOutlet var genderLabel: UILabel!
    var delegate: ChildFormViewCellDelegate!


}

extension ChildFormViewCell: UITextFieldDelegate {
    func textFieldDidEndEditing(textField: UITextField) {
        switch(textField) {
        case self.firstNameField:
            self.delegate.getFirstName(firstNameField.text)

        case self.lastNameField:
            self.delegate.getLastName(lastNameField.text)

        case self.dateField:
            self.delegate.getDateOfBirth(dateField.text)

        case self.genderLabel:
            self.delegate.getGender(genderLabel.text)

        default:
            return
        }
    }
}

protocol ChildFormViewCellDelegate {
    func getFirstName(text: String?)
    func getLastName(text: String?)
    func getDateOfBirth(text: String?)
    func getGender(text: String?)
}

Answer 1

然后尝试:

    //This will call back after focus is lost from the input    
self.textField.addTarget(self, action: #selector(updateFirstName), forControlEvents: .EditingDidEnd)
    //This will call back with every change, i.e. each letter
self.textField.addTarget(self, action: #selector(updateFirstName), forControlEvents: .EditingChanged)

此外，在将 self 添加为目标的情况下，self 表示 UITableViewController。据我所知，一个对象不能是它自己的委托(delegate)。如果可能的话那就毫无意义了。