在多個視圖控制器之間共享數據而無須隔離（Swift 3）

Question

我正在做一個QR碼掃描儀測驗應用程序，用戶必須從10個問題中獲得10分。 在用戶使用第一個qn之后，分數將加1，並將其返回到qr掃描器頁面，在該頁面中，他們必須掃描QR碼以查找下一個qn。 問題是得分數據的傳遞。 有沒有辦法做到沒有秘密？

這是我的qn1controller

import UIKit

class Quiz1Controller: UIViewController {

    @IBOutlet var question: UILabel!
    @IBOutlet var button1: UIButton!
    @IBOutlet var button2: UIButton!
    @IBOutlet var button3: UIButton!
    @IBOutlet var button4: UIButton!
    @IBOutlet var LabelEnd: UILabel!
    @IBOutlet var scorelabel: UILabel!
    var score = Int()
    var CorrectAnswer = String()

    override func viewDidLoad() {
        super.viewDidLoad()

        RandomQuestions()
    }

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

    func RandomQuestions(){

        var RandomNumber = arc4random() % 1
        RandomNumber += 1

        switch(RandomNumber){
        case 1:
            question.text = "Who is the current Deputy Chairman of People's Association?"
            button1.setTitle("Lee Hsien Loong", for: .normal)
            button2.setTitle("Chan Chun Sing", for: .normal)
            button3.setTitle("Goh Chok Tong", for: .normal)
            button4.setTitle("Goh Khen Swee", for: .normal)
            CorrectAnswer = "2"
            Hide()
            break
        default:
            break
        }
    }

    func Hide(){
        LabelEnd.isHidden = true
    }
    func UnHide(){
        LabelEnd.isHidden = false
    }

    @IBAction func Button1(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "1"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button2(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "2"){
            score = score + 1
            scorelabel.text = "Score:\(score)"
            self.performSegue(withIdentifier: "correct", sender: self)            
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button3(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "3"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button4(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "4"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

}

這是我的Qn2控制器

import UIKit

class Quiz2Controller: UIViewController {

    @IBOutlet var question: UILabel!
    @IBOutlet var button1: UIButton!
    @IBOutlet var button2: UIButton!
    @IBOutlet var button3: UIButton!
    @IBOutlet var button4: UIButton!
    @IBOutlet var LabelEnd: UILabel!
    @IBOutlet var scorelabel: UILabel!
    var score = Int()
    var CorrectAnswer = String()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        RandomQuestions()
    }

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

    func RandomQuestions(){

        var RandomNumber = arc4random() % 1
        RandomNumber += 1

        switch(RandomNumber){
        case 1:
            question.text = "Who is the founder of People's Association?"
            button1.setTitle("Lee Hsien Loong", for: .normal)
            button2.setTitle("Lee Kuan Yew", for: .normal)
            button3.setTitle("Goh Chok Tong", for: .normal)
            button4.setTitle("Goh Khen Swee", for: .normal)
            CorrectAnswer = "1"
            Hide()
            break
        default:
            break
        }
    }

    func Hide(){
        LabelEnd.isHidden = true
    }
    func UnHide(){
        LabelEnd.isHidden = false
    }

    @IBAction func Button1(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "1"){
            score = score + 1
            scorelabel.text = "Score:\(score)"
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button2(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "2"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button3(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "3"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

    @IBAction func Button4(_ sender: Any) {
        UnHide()

        if (CorrectAnswer == "4"){
            self.performSegue(withIdentifier: "correct", sender: self)
        }
        else {
            LabelEnd.text = "Incorrect Answer! Try again"
        }
    }

}

故事板：

Answer 1

刪除Seague並按如下操作。 假設您要共享NSMutableDictionary 。

只需將變量作為要與viewController共享的類型。

對於考試。 您想與ShareViewController共享數據，然后使用類似

var Dict_data = NSMutableDictionary()

現在，您要導航到的地方，就像“假設這是您的ShareViewController”一樣。 記住不要忘記將StoryViewBoard的ShareViewController的標識符。

    let PV = self.storyboard?.instantiateViewController(withIdentifier: "ShareViewController") as! ShareViewController
    PV.data = dict_share_date 
    self.navigationController?.pushViewController(PV, animated: true)

這里dict_share_data是您的NSMutableDictionry 。 您可以采用任何類型，但請記住，兩種類型都必須相同。 或者您可以進行類型轉換。

Answer 2

您可以使用AppDelegate在多個Viewcontroller之間共享數據。 您始終可以保存，更新和檢索在App的AppDelegate中定義的數據。 這是我以前的回答，可以有效地使用它來使用Appdelegate。請告訴我您是否需要Swift版本。

在您的AppDelegate中，將變量定義為

class AppDelegate: UIResponder, UIApplicationDelegate {
  var window: UIWindow?
  var points : String? // Declare your object
  .... other methods
}
//You can access the property to save and retrieve your file. You can save 
let app = UIApplication.shared.delegate as! AppDelegate
app.points = "yourString"

 Yo can read properties from any viewcontroller as per your requirement as 

let app = UIApplication.shared.delegate as! AppDelegate
let points = app.points?

您還可以使用NSNotificationCenter在多個viewcontoller中共享數據。 請讓我知道您是否對查詢進行了改版。

如果您需要在導航時將數據從一個ViewController傳遞到另一個ViewController，您還可以使用使用Storyboard ID的ViewContoller實例化，如@Jeetendra在他的回答中所述。