我正在创建一个基本上是联系人列表的简单应用程序。我的MasterViewController有我的所有联系人，DetailViewController有联系人的详细信息，例如：firstname，middlename，lastname等。当我在DetailViewController中输入数据时，它应该保存并点击后退按钮自动保存这些数据。除此之外的一切都很好。我输入数据并点击后退按钮，数据无法保存。如果我能得到任何帮助，我将不胜感激。我知道这是一个简单的错误，但我无法弄清楚它是什么。
DetailViewController
import UIKit
protocol DetailViewControllerDelegate{
func detailViewController(dvc: DetailViewController, didUpdate contact:Person)
}
class DetailViewController: UIViewController {
var delegate: DetailViewControllerDelegate?
var contact: ContactListEntry!
@IBOutlet weak var txtphonenumber: UITextField!
@IBOutlet weak var txtlastname: UITextField!
@IBOutlet weak var address: UITextField!
@IBOutlet weak var yearOfBirth: UITextField!
@IBOutlet weak var middleName: UITextField!
@IBOutlet weak var firstName: UITextField!
@IBAction func okPressed(sender: AnyObject) {
if let lastname = txtlastname.text
{
if let phonenumber = txtphonenumber.text
{
if let firstName = firstName.text
{
if let middleName = middleName.text
{
if let yearOfBirth = yearOfBirth.text
{
contact.lastName = lastname
contact.phoneNumber = phonenumber
contact.firstName = firstName
contact.middleName = middleName
contact.yearOfBirth = yearOfBirth.toInt()
delegate?.detailViewController(self,didUpdate: contact)
}
}
}
}
}
}
override func viewDidAppear(animated: Bool) {
firstName.text = "\(contact.firstName)"
txtlastname.text = "\(contact.lastName)"
txtphonenumber.text = "\(contact.phoneNumber)"
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
MasterViewController
import UIKit
class contactTableViewController: UITableViewController,
DetailViewControllerDelegate{
var contacts: [ContactListEntry] = []
var currentContact: ContactListEntry!
var detailObject: DetailViewController!
override func viewDidLoad() {
super.viewDidLoad()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.leftBarButtonItem = self.editButtonItem()
}
@IBAction func addContact(sender: AnyObject) {
currentContact = ContactListEntry(firstName: "", lastName: "", phoneNumber: "123")
contacts.append(currentContact)
performSegueWithIdentifier("showDetail", sender: self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return contacts.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("contactcell", forIndexPath: indexPath) as! UITableViewCell
let contact = contacts[indexPath.row]
cell.textLabel?.text = "\(contact.firstName) ,\(contact.lastName) ,\(contact.phoneNumber)"
return cell
}
/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the specified item to be editable.
return true
}
*/
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
contacts.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
} else if editingStyle == .Insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
/*
// Override to support rearranging the table view.
override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the item to be re-orderable.
return true
}
*/
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let cell = sender as? UITableViewCell
{
let indexPath = tableView.indexPathForCell(cell)!
currentContact = contacts[indexPath.row]
}
if let dvc = segue.destinationViewController as? DetailViewController
{
dvc.contact = currentContact
dvc.delegate = self
}
}
func detailViewController(dvc: DetailViewController, didUpdate contact: Person)
{
dvc.dismissViewControllerAnimated(true, completion: nil)
navigationController?.popToViewController(self, animated: true)
tableView.reloadData()
}
}
Swift文件
import Foundation
class Person{
var firstName: String
var middleName: String?
var lastName: String
var yearOfBirth: Int?
let currentYear = NSCalendar.currentCalendar().component(NSCalendarUnit.CalendarUnitYear, fromDate: NSDate())
//delegated initialiser
init(firstName: String, lastName: String, yearOfBirth: Int? = nil, middleName: String? = nil)
{
self.firstName = firstName
self.lastName = lastName
self.yearOfBirth = yearOfBirth
self.middleName = middleName
}
//convenience initialiser
convenience init(firstName: String, lastName: String, age: Int, middleName: String? = nil)
{
self.init(firstName: firstName, lastName: lastName, age: age, middleName: middleName)
}
//Age as computed property
//This calculates the age from the current year and year of birth
var age: Int!{
get{
self.age = currentYear - yearOfBirth!
return self.age
}
set{
self.yearOfBirth = currentYear - age
}
}
//Fullname function which returns the fullname of the person when first name and last name is entered
func fullName() -> String
{
if middleName != nil{
return firstName + " " + middleName! + " " + lastName
} else {
return firstName + " " + lastName
}
}
}
// A subclass of person class that accepts address and phone number too
class ContactListEntry: Person{
var address : String?
var phoneNumber : String?
init(firstName: String, lastName: String, yearOfBirth: Int? = nil, middleName: String? = nil, address: String? = nil, phoneNumber: String? = ""){
self.address = address
self.phoneNumber = phoneNumber
super.init(firstName: firstName, lastName: lastName, yearOfBirth: yearOfBirth?, middleName: middleName?)
}
}
// Class to accept the contact list entries
class ContactList{
var entries: [ContactListEntry]=[]
}
答案 0 :(得分：0)
首先，从Swift 1.2开始，你可以绑定多个选项，不需要嵌套的if：
if let lastname = txtlastname.text,
phonenumber = txtphonenumber.text,
firstName = firstName.text,
middleName = middleName.text,
yearOfBirth = yearOfBirth.text {
// ...
}
更新：看起来您点按系统提供的＆＃39;返回＆＃39;按钮，在您执行segue到详细视图后自动出现在导航栏中。如果是这种情况，只需将代码从okPressed()移至viewWillDisappear()方法即可。然后，在detailViewController(dvc: DetailViewController, didUpdate contact:Person)方法中，您只需拥有tableView.reloadData()，即可摆脱其余部分。希望这有效！