如何使用 UserDefaults.standard 在 Swift 3.0 中保持会话?
How Keep session in Swift 3.0 using UserDefaults.standard?
我有两 (2) 个 swift 3.0 文件。
已编辑:
我的目标是在登录成功后保留 ViewController active/appear。
我想在点击注销按钮时保持 LoginVC 处于活动状态。
一切正常,例如发布和读取 json 数据。
已编辑:
ViewController 登录时成功激活,但是当我点击注销按钮时,停止并重新构建它,ViewController 仍然没有关闭。它应该重定向到 LoginVC。
我认为我的 UserDefaults.standard 代码可能有问题。
我的代码如下
ViewController.swift
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() { super.viewDidLoad() }
override func viewDidAppear(_ animated: Bool) {
let isUserLoggedIn = UserDefaults.standard.bool(forKey: "isUserLoggedIn")
if(!isUserLoggedIn){
self.performSegue(withIdentifier: "loginview", sender: self)
}
}
@IBAction func logoutData(_ sender: Any) {
UserDefaults.standard.set(true, forKey: "isUserLoggedIn");
UserDefaults.standard.synchronize();
self.performSegue(withIdentifier: "loginview", sender: self)
}
}
LoginVC.swift
import UIKit
class LoginVC: UIViewController {
@IBOutlet var _login: UITextField!
@IBOutlet var _pass: UITextField!
var login: String!
var pass: String!
override func viewDidLoad() { super.viewDidLoad() }
@IBAction func loginData(_ sender: Any) {
login = _login.text
pass = _pass.text
if(login == "" || pass == "") {
return
}
else {
let url = URL(string: "http://localhost/login.php")
let session = URLSession.shared
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
let paramToLogin = "login=\(login!)&pass=\(pass!)"
request.httpBody = paramToLogin.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(data, response, error) in
if error != nil {
return
}
else {
do {
if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String]
{
DispatchQueue.main.async {
let success = Int(json["message"]!)
if(success == 1){
UserDefaults.standard.set(true, forKey: "isUserLoggedIn")
UserDefaults.standard.synchronize();
self.dismiss(animated: true, completion: nil)
return
}
}
}
}
catch { }
}
})
task.resume()
}
}
}
在注销期间的代码中,值 "true" 也存储在 UserDefaults 中。我认为这可能是问题所在。
let loginStroyBoard = UIStoryboard(name:"Login", bundle: nil)
let businessLoginViewController = loginStroyBoard.instantiateViewController(withIdentifier: "BusinessLoginViewController") as! BusinessLoginViewController
let refreshAlert = UIAlertController(title: "Log Out", message: "Are You Sure to Log Out ? ", preferredStyle: UIAlertControllerStyle.alert)
refreshAlert.addAction(UIAlertAction(title: "Confirm", style: .default, handler: { (action: UIAlertAction!) in
self.present(businessLoginViewController, animated: true, completion: nil)
DispatchQueue.main.async {
UserDefaults.standard.removeObject(forKey: "isFirstTime")
UserDefaults.standard.removeObject(forKey: "isLogIn")
UserDefaults.standard.removeObject(forKey: "uid")
UserDefaults.standard.removeObject(forKey: "hash")
UserDefaults.standard.removeObject(forKey: "storeadminid")
UserDefaults.standard.removeObject(forKey: "adminhash")
UserDefaults.standard.removeObject(forKey: "store_id")
UserDefaults.standard.removeObject(forKey: "isLogIn")
UserDefaults.standard.removeObject(forKey: "login_id")
UserDefaults.standard.removeObject(forKey: "password")
UserDefaults.standard.setValue(false, forKey: "islogout")
}
//self.tabBarController?.tabBar.resignFirstResponder()
}))
refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action: UIAlertAction!) in
refreshAlert .dismiss(animated: true, completion: nil)
}))
present(refreshAlert, animated: true, completion: nil)
}
我也将使用它来注销..
你可以试试这个,我会用我的手机注销按钮来做。
我有两 (2) 个 swift 3.0 文件。
已编辑:
我的目标是在登录成功后保留 ViewController active/appear。 我想在点击注销按钮时保持 LoginVC 处于活动状态。
一切正常,例如发布和读取 json 数据。
已编辑:
ViewController 登录时成功激活,但是当我点击注销按钮时,停止并重新构建它,ViewController 仍然没有关闭。它应该重定向到 LoginVC。
我认为我的 UserDefaults.standard 代码可能有问题。
我的代码如下
ViewController.swift
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() { super.viewDidLoad() }
override func viewDidAppear(_ animated: Bool) {
let isUserLoggedIn = UserDefaults.standard.bool(forKey: "isUserLoggedIn")
if(!isUserLoggedIn){
self.performSegue(withIdentifier: "loginview", sender: self)
}
}
@IBAction func logoutData(_ sender: Any) {
UserDefaults.standard.set(true, forKey: "isUserLoggedIn");
UserDefaults.standard.synchronize();
self.performSegue(withIdentifier: "loginview", sender: self)
}
}
LoginVC.swift
import UIKit
class LoginVC: UIViewController {
@IBOutlet var _login: UITextField!
@IBOutlet var _pass: UITextField!
var login: String!
var pass: String!
override func viewDidLoad() { super.viewDidLoad() }
@IBAction func loginData(_ sender: Any) {
login = _login.text
pass = _pass.text
if(login == "" || pass == "") {
return
}
else {
let url = URL(string: "http://localhost/login.php")
let session = URLSession.shared
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
let paramToLogin = "login=\(login!)&pass=\(pass!)"
request.httpBody = paramToLogin.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(data, response, error) in
if error != nil {
return
}
else {
do {
if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String]
{
DispatchQueue.main.async {
let success = Int(json["message"]!)
if(success == 1){
UserDefaults.standard.set(true, forKey: "isUserLoggedIn")
UserDefaults.standard.synchronize();
self.dismiss(animated: true, completion: nil)
return
}
}
}
}
catch { }
}
})
task.resume()
}
}
}
在注销期间的代码中,值 "true" 也存储在 UserDefaults 中。我认为这可能是问题所在。
let loginStroyBoard = UIStoryboard(name:"Login", bundle: nil)
let businessLoginViewController = loginStroyBoard.instantiateViewController(withIdentifier: "BusinessLoginViewController") as! BusinessLoginViewController
let refreshAlert = UIAlertController(title: "Log Out", message: "Are You Sure to Log Out ? ", preferredStyle: UIAlertControllerStyle.alert)
refreshAlert.addAction(UIAlertAction(title: "Confirm", style: .default, handler: { (action: UIAlertAction!) in
self.present(businessLoginViewController, animated: true, completion: nil)
DispatchQueue.main.async {
UserDefaults.standard.removeObject(forKey: "isFirstTime")
UserDefaults.standard.removeObject(forKey: "isLogIn")
UserDefaults.standard.removeObject(forKey: "uid")
UserDefaults.standard.removeObject(forKey: "hash")
UserDefaults.standard.removeObject(forKey: "storeadminid")
UserDefaults.standard.removeObject(forKey: "adminhash")
UserDefaults.standard.removeObject(forKey: "store_id")
UserDefaults.standard.removeObject(forKey: "isLogIn")
UserDefaults.standard.removeObject(forKey: "login_id")
UserDefaults.standard.removeObject(forKey: "password")
UserDefaults.standard.setValue(false, forKey: "islogout")
}
//self.tabBarController?.tabBar.resignFirstResponder()
}))
refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action: UIAlertAction!) in
refreshAlert .dismiss(animated: true, completion: nil)
}))
present(refreshAlert, animated: true, completion: nil)
}
我也将使用它来注销..
你可以试试这个,我会用我的手机注销按钮来做。