如何通过 JSON 将数组从 php 解压到 Swift

Question

我正在从 PHP 中将 Array 检索到 Swift 中，其中包含来自几个 SQL 查询的值。

在 Swift 中通过以下代码发送、接收和打印数组：

let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
DispatchQueue.main.async
{

let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]

print (json)
}

该数组包含 userDetails 和 Communities，它在 Xcode 中的输出（通过打印调试）如下所示：

Optional(["userDetails": {
id = 2;
"user_email" = "radowns82@gmail.com";
"user_name" = "<null>";
}, "communities": <__NSArrayI 0x60000002f500>(
{
name = Gallelio;
},
{
name = GallelioPart2;
}
)
])
Optional(["userDetails": {
id = 30;
"user_email" = "sam.bawdry@gmail.com";
"user_name" = "Samuel Bawdry";
}, "communities": <__NSArrayI 0x60800026e180>(
{
name = TesetTester;
},
{
name = Westbrook2;
},
{
name = WinnersOnly;
},
{
name = OneTwoThree;
},
{
name = WhoopdeWhoop;
}
)
])

我现在如何解压缩“社区”的内容，以便可以在 UITableVIew 中显示其内容 - 我已经设置了 UITableView 并使用了“虚拟数据”。

这是完整的 Swift 脚本：

import UIKit

protocol UsernameSentDelegate {
func userLoggedIn(data: String)
}

class LoginViewController: UIViewController {

var delegate: UsernameSentDelegate? = nil

@IBOutlet weak var userEmailTextField: UITextField!
@IBOutlet weak var userPasswordTextField: UITextField!
@IBOutlet weak var displayUserName: UILabel!
var communitiesArray  = [String]()


@IBAction func loginButtonTapped(_ sender: AnyObject)
{

    let userEmail = userEmailTextField.text;
    let userPassword = userPasswordTextField.text;

    if (userPassword!.isEmpty || userEmail!.isEmpty) { return; }

// send user data to server side


    let myUrl = URL(string: "http://www.quasisquest.uk/KeepScore/userLogin.php");

    var request = URLRequest(url:myUrl!);

    request.httpMethod = "POST";

    let postString = "email=\(userEmail!)&password=\(userPassword!)";

    request.httpBody = postString.data(using: String.Encoding.utf8);

    let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
        DispatchQueue.main.async
            {


               if(error != nil)
                {

                    //Display an alert message
                    let myAlert = UIAlertController(title: "Alert", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert);
                    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler:nil)
                    myAlert.addAction(okAction);
                    self.present(myAlert, animated: true, completion: nil)
                    return
                }

                do {

                    let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]

                    if let arr = json?["communities"] as? [String:String] {
                    self.communitiesArray = arr.map { $0["name"] }
                }


                    // retrieve login details and check to see if all ok

                    if let parseJSON = json {

                        let returnValue = parseJSON["status"] as? String

                        if(returnValue != "error")
                        {

                            self.delegate?.userLoggedIn(data: userEmail! )

                            UserDefaults.set(UserDefaults.standard)(true, forKey: "isUserLoggedIn");


                            self.dismiss(animated: true, completion: nil)


                        } else {
                            // display an alert message
                            let userMessage = parseJSON["message"] as? String
                            let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert);
                            let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler:nil)
                            myAlert.addAction(okAction);
                            self.present(myAlert, animated: true, completion: nil)
                        }

                    }
                } catch
                {
                    print(error)
                }


        }



    }

    task.resume()


}

override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{

    if segue.identifier == "loginView" {
        let createViewController: ViewController = segue.destination as! ViewController
        createViewController.communities = communitiesBox
        print (communitiesBox)
    }


}



}

Answer 1

您可以使用两种方法来做到这一点。

声明一个[[String:String]] 类型的Array 并将其与您的TableView 一起使用。

var communitiesArray = [[String:String]]()

let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in

    let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]
    if let arr = json["communities"] as? [[String:String]] {
        self.communitiesArray = arr
    }      
    DispatchQueue.main.async {
        self.tableView.reloadData()
    }

现在在tableView 方法集中使用communitiesArray 像cell.label.text = self.communitiesArray[indexPath.row]["name"]

如果您的communities 仅获得name 值，那么如果您只创建[String] 类型的数组，就像这样。

var communitiesArray = [String]()

let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in

    let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]
    if let arr = json["communities"] as? [[String:String]] {
        self.communitiesArray = arr.flatMap { $0["name"]}
    }      
    DispatchQueue.main.async {
        self.tableView.reloadData()
    }

现在在tableView 方法集中使用communitiesArray 就像cell.label.text = self.communitiesArray[indexPath.row] 一样