swift - 使用 UI 保存按钮更新文本字段(快速)

Question

我正在尝试更新文本字段中的信息，因此当按下保存按钮时，它会更新字典中的信息并反射(reflect)在之前的 UITable 上。这是学生信息快速页面的代码。我似乎无法让它更新它保持不变的信息。

protocol saveProtocol
{
func updateStudentInfo(firstName: String?)
}


class StudentInfoViewController: UIViewController {

var studentRecord = Dictionary<String, String>()
var delegate: saveProtocol?

@IBOutlet weak var firstName: UITextField!
@IBOutlet weak var lastName: UITextField!
@IBOutlet weak var emailAddress: UITextField!
@IBOutlet weak var studentMajor: UITextField!

@IBOutlet weak var numberOfCredits: UITextField!


override func viewDidLoad() {
    super.viewDidLoad()
    self.title = studentRecord["firstName"]! + " " + studentRecord["lastName"]!
    // Do any additional setup after loading the view.
    firstName.text = studentRecord["firstName"]
    lastName.text = studentRecord["lastName"]
    emailAddress.text = studentRecord["email"]
    studentMajor.text = studentRecord["major"]
    numberOfCredits.text = studentRecord["numberOfCredits"]
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func updateStudentInfo(sender: UIBarButtonItem) {


    delegate?.updateStudentInfo(studentRecord["firstName"])
    self.navigationController?.popViewControllerAnimated(true)

}

}

Answer 1

您应该在 updateStudentInfo(sender:) 方法中更新 studentRecords 字典。由于 Swift.String 是值类型，而不是引用类型，因此更改 firstName.text 不会更改 studentRecords 中的内容

@IBAction func updateStudentInfo(sender: UIBarButtonItem) {
    self.studentRecord["firstName"] = firstName.text
    self.studentRecord["lastName"] = lastName.text
    // + all the other ones


    delegate?.updateStudentInfo(studentRecord["firstName"])
    self.navigationController?.popViewControllerAnimated(true)

}