arrays - 将 json 数组传递给另一个 View Controller 并使用 segue 在不同的标签中显示它

Question

我想将 json 数组发送到另一个 View Controller ，并在另一个 View Controller 中以不同的标签显示它？？

var sendData = [String: AnyObject]()
sendData = datas
print("Send Data : \(sendData)")
DispatchQueue.main.async {
   self.performSegue(withIdentifier: "checkLoginViewController", sender: sendData)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destinationVC = segue.destination as? signUpViewController {
            if let sendmyArray = sender as? [String]{
                destinationVC.myarray = sendmyArray
            }
}

signUpViewController.swift:

var myarray = [String]()
var myemail = ""
var myname = ""

override func viewDidLoad() {
    super.viewDidLoad()
    MynameLabel.text = myname
    nameTextfield.text = myemail
    myarray = [myemail,myname]
    print(myarray)        
    print(myemail)
    print(myname)
}

我能够获取数组，但我无法将数组发送到另一个 View Controller ，我必须在不同的标签中显示它

Answer 1

你混淆了数组和字典

• sendData 是字典 ([String: AnyObject])
• myarray 是数组 ([String])

当然可选向下转换 sender as? [String] 失败，因为发件人是字典。

因为源是一个包含String 键和值的字典，将代码更改为

var sendData = [String: String]()

...

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if let destinationVC = segue.destination as? signUpViewController,
      let sendmyDictionary = sender as? [String: String] { 
         destinationVC.myDictionary = sendmyDictionary
   }
}

在第二个 Controller 中

var myDictionary = [String: String]()

override func viewDidLoad() {
    super.viewDidLoad()

    MynameLabel.text = myDictionary["name"]
    nameTextfield.text = myDictionary["email"]
}

---

注意:Swift 3+ 中的未指定值类型字典是 [String:Any]，根据命名约定，变量名称应该以小写字母开头。