套接字中的异常行为。Swift中的io

按照标题,我在处理socket.io时遇到了一些问题。它在第一个视图控制器中连接得非常好,因此在第二个控制器中会发生奇怪的事情。

下面是代码:

第一个控制器:我声明了一些全局变量,用于两个视图控制器之间的连接。

import UIKit
import SocketIOClientSwift
import SwiftyJSON
import CoreData

//declare some global variable
var patientCoreData = [NSManagedObject]()
var numberOfUsersExisting:Int = 0 //assign to 0 by default
var appUserData: Patient? //for specific user
var pSample: Array<Patient> = [] //for all user

//initiate socket globally
let socket = SocketIOClient(socketURL: "localhost:3000", options: [
    "reconnects": true
])

func reportStatus(){
    socket.on("connect") {data, ack in
        print("Report status: View Controller connected")
        socket.emit("click", "Client app connected")
    }
}

func readDataFromSocket(completion: (data:AnyObject)-> ()){
    socket.on("reply") {data, ack in
        print("database replied")
        completion(data: data)
    }//socket
}//readDataFromSOCKET

func importData(){
    reportStatus()
    socket.connect()
    readDataFromSocket(){ data in
        let json = JSON(data)
        let nou = json[0].count
        if nou > 0 {
            print("Test(1st VC): grabbing data from database")
            for var i=0; i<nou; ++i{
                numberOfUsersExisting = nou
                pSample += [Patient(id: json[0][i]["ID"].intValue, name: json[0][i]["Name"].stringValue, gender: json[0][i]["Gender"].stringValue, mileage: json[0][i]["Mileage"].doubleValue)]
            pSample.sortInPlace({$0.globalPatientMileAge < $1.globalPatientMileAge})
        }
        print("Successfully grabbed data")
    }else{
        print("No user in the database")
        numberOfUsersExisting = 0
    }
}//readDataFromSocket
}

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout{
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()

}

override func viewDidLoad() {
    super.viewDidLoad()

}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    print("First view appeared")
    let prefs = NSUserDefaults.standardUserDefaults()

    //if an user has logged in
    let isLoggedIn = prefs.integerForKey("ISLOGGEDIN") as Int
    if (isLoggedIn != 1){
        print("No user currently, so heading to login screen")
        socket.disconnect()
        self.performSegueWithIdentifier("gotoLogin", sender: self)
    }else{
        print("ViewDidAppear: An user has been logged in")
        let permissionToLoadData = prefs.integerForKey("ISLOGGEDIN")

        if (permissionToLoadData != 1) {
            print("Please grant permission to get data")
        }else{
            print("First view: connecting to database")

            importData()

        }//permission to load data
    }
}//end of viewDidAppear

}

第二控制器:

import UIKit
import SocketIOClientSwift
import SwiftyJSON
import CoreData

var nou:Int?

class LoginViewController: UIViewController {
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let registeredUserID = NSUserDefaults.standardUserDefaults().stringForKey("registerPatientID")
let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

func displayAlertMessage(userMessage:String){
    let alert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert)
    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)
    alert.addAction(okAction)
    self.presentViewController(alert, animated: true, completion: nil)
}

func successMessage(userMessage:String){
    let alert = UIAlertController(title: "Welcome Back", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert)
    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)
    alert.addAction(okAction)
    self.presentViewController(alert, animated: true, completion: nil)
}

@IBOutlet weak var loginPatientID: UITextField!

@IBAction func LoginButton(sender: AnyObject) {

    let logInUserID = loginPatientID.text
    if (logInUserID!.isEmpty){
        displayAlertMessage("Please enter your Patient ID!")
        return
    }else{
        print("Test: requesting login permission from database")

        socket.emit("loginRequest", logInUserID!)
        print("Test: requested")

        socket.on("loginReply") {data, ack in
            let jsonLogin = JSON(data)
            if jsonLogin[0].intValue == 1{
                print("Test: ID Matched, putting up ViewController")

                self.prefs.setObject(logInUserID, forKey: "AppUserID")
                self.prefs.setInteger(1, forKey: "ISLOGGEDIN")
                self.prefs.synchronize()

                let permissionToLoadData = self.prefs.integerForKey("ISLOGGEDIN")

                if (permissionToLoadData != 1) {
                    print("Please grant permission to get data")
                }else{
                    print("First view: connecting to database")

                    importData()
                    print("Did you import?")

                }//permission to load data

                self.loginPatientID.resignFirstResponder()
                self.dismissViewControllerAnimated(true, completion: nil)
            }else if jsonLogin[0].intValue == 0{
                    self.displayAlertMessage("Sorry, you are not assigned to this program")
            }else if jsonLogin[0].intValue == 3{
                print("Test: Query problem")
            }else{
                print("Test: not getting anything from ID database")
            }
        }//socket.on
    }//else
}//login button


override func viewDidLoad() {
    super.viewDidLoad()
    print("Login View Controller loaded")

}

override func viewDidAppear(animated: Bool) {
    socket.connect()
    print("LoginVC: establishing connection")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    self.view.endEditing(true)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

}

你可能已经注意到了 第一视图控制器 ,当 视图显示() 启动时,应用程序将检查用户是否登录。如果有人已经登录,那就没事了。如果没有人登录,它将执行segue(模式segue)以 第二视图控制器 .

登录表单将呈现在第二视图控制器中,并且一旦用户点击登录按钮, 你可能想看看代码 .

让我们假设一切正常,直到importData(),函数根本没有启动,但应用程序只是继续运行,为什么?

这是控制台的屏幕截图,请注意“您导入了吗?”,如果启动该功能,应用程序将从第一视图控制器返回一些附加消息。