Ios 在Swift 3.0中，如何在控制器之间传递JSON数据？

我有这些JSON数据：

{"login":"ET001","email":"email@try.com"}

在Swift 3.0中，我创建了两个文件，即LoginVC和ViewController

只有在LoginVC验证凭据后才能访问ViewController。到目前为止，我设法让登录名基于数据库中的“成功”JSON数据访问ViewController页面

但我的下一个目标是将JSON数据“[login]”从LoginVC传递到ViewController

在ViewController中，我创建了UILabel“loginLbl”以显示来自LoginVC的JSON值

如何更新我的代码

斯威夫特酒店 ViewController.swift

---

如何将其传递到UILabel loginLbl？

一旦您确定登录数据在响应中是正确的，您需要在导航控制器中推送viewController，并在viewController中获取一个字典，并将json分配给该字典

if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String] {
                        DispatchQueue.main.async {
                            let success  = Int(json["success"]!)
                            let loginvaluefromdb = json["login"]
                            if(success == 1){
                                let viewController = self.storyboard?.instantiateViewController(withIdentifier: "yourViwController") as! yourViwController
                    viewController.dictJson = json
                    self.navigationController?.pushViewController(viewController, animated: true)
                            }

您需要在prepare for segue方法中传递数据： 这是editec代码

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "goToViewController" {
        if let destination = segue.destination as? ViewController {
            // Here you will copy tha data you want to pass
            destination.passedData = sender as? String
            print("Sender Value: \(sender)")
        }
    }
}

---

是的，我知道这个问题可能是重复的。但是我仍然对如何传递数据感到困惑@AlotJai您的代码中没有导航代码。您的意思是从LoginVC到ViewController的导航？@AlotJai是的，我正在进行导航。谢谢您的回复。让我先试试。谢谢：D“dictJson”来自何处？在您使用IBMoutlet for LoginBL的viewcontroller中，放置此dictJson属性。设dictJson=Dictionary（）

if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String] {
                        DispatchQueue.main.async {
                            let success  = Int(json["success"]!)
                            let loginvaluefromdb = json["login"]
                            if(success == 1){
                                let viewController = self.storyboard?.instantiateViewController(withIdentifier: "yourViwController") as! yourViwController
                    viewController.dictJson = json
                    self.navigationController?.pushViewController(viewController, animated: true)
                            }

 if(success == 1){
           self.outputLbl.text = loginvaluefromdb;
           // Here you trigger the segue
           self.performSegue(withIdentifier: "goToViewController", sender: loginvaluefromdb)
           return
         }

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "goToViewController" {
        if let destination = segue.destination as? ViewController {
            // Here you will copy tha data you want to pass
            destination.passedData = sender as? String
            print("Sender Value: \(sender)")
        }
    }
}