如何獲取UserDefaults中的列表值

Question

我有一個func中的json數據1獲取數據有1個列表值，但我用userdefault出去func調用值我得到1個值。

func getdevices() { 
    var token = UserDefaults.standard.string(forKey: "token") 
    print("token", token) 
    var username = UserDefaults.standard.string(forKey: "username") 
    print("username", username) 
    let url: URL = URL(string: "/public/devices")! 
    let request: NSMutableURLRequest = NSMutableURLRequest(url: url) 

    request.httpMethod = "Get" 
    request.setValue(token , forHTTPHeaderField: "token") 
    request.setValue(username, forHTTPHeaderField: "username") 

    var responseError: NSError? 
    var response: URLResponse? 

    var urlData: Data? 

    do { 

     urlData = try NSURLConnection.sendSynchronousRequest(request as URLRequest, returning:&response) 

    } catch let error as NSError { 
     responseError = error 
     urlData = nil 
    } 
    if (urlData != nil) { 
     let res = response as! HTTPURLResponse!; 

     print("Response code: %ld tra ve" , res?.statusCode); 

     if ((res?.statusCode)! >= 200 && (res?.statusCode)! < 300) 
     { 
      //let responseData:NSString = NSString(data:urlData!, encoding:String.Encoding.utf8.rawValue)! 
      if let json = try? JSONSerialization.jsonObject(with: urlData!, options: []) as? [String : Any], 
       //let dataArray = json?["status"] as? [String : Any], 

       let items = json?["units"] as? [[String : Any]] { 

       for item in items { 

        var lat = item["latitude"] as? String 
        UserDefaults.standard.set(lat, forKey: "latitude") 
        var test = UserDefaults.standard.double(forKey: "latitude") 

        print("test", test) 

        var long = item["longitude"] as? String 
        UserDefaults.standard.set(long, forKey: "longitude") 

        print("long", long) 
        var devid = item["devid"] as? String 
        UserDefaults.standard.set(devid, forKey: "devid") 
        var devname = item["devname"] as? String 
        UserDefaults.standard.set(devname, forKey: "devname") 

        var speed = item["speed"] as? String 
        UserDefaults.standard.set(speed, forKey: "speed") 

        var statustt = item["status"] as? String 
        UserDefaults.standard.set(statustt, forKey: "statusxe") 
        var drivername = item["drivername"] as? String 
        UserDefaults.standard.set(drivername, forKey: "drivername") 
        var address = item["address"] as? String 
        UserDefaults.standard.set(address, forKey: "address") 

        print("address", address) 
       } 
      } 
     } 
    } 
} 

但是，當應用程序存在func它不會得到列表數據，它有一個值。

override func viewDidAppear(_ animated: Bool) { 

    GMSServices.provideAPIKey("AIzaSyB2IJzNc2s5km1qvdwAePDEat1OdPsOFVA") 

    guard let address = UserDefaults.standard.string(forKey: "address") else {return} 
getdevices() 

    var lat = UserDefaults.standard.double(forKey: "latitude") 
    var long = UserDefaults.standard.double(forKey: "longitude") 
    var devname = UserDefaults.standard.string(forKey: "devname") 
    var speed = UserDefaults.standard.string(forKey: "speed") 
    print("lat", lat) 
    print("long", long) 
    print("address***", address) 



    let camera = GMSCameraPosition.camera(withLatitude: lat, longitude: long, zoom: 10) 
    let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera) 
    view = mapView 
    let marKer = GMSMarker() 
    marKer.position = CLLocationCoordinate2D(latitude: lat, longitude: long) 
    marKer.icon = UIImage(named: "vehicle_105") 
    marKer.title = "Biển số \(devname)" 
    //marKer.title = "Speed \(speed)" 
    marKer.map = mapView 

} 

Answer 1

您只能在單個鍵下存儲單個對象/值在UserDefaults。問題是，在循環的每次迭代中，您都覆蓋同一個鍵下的值。你應該做的是在循環之前創建一個數組，在循環內將值添加到該數組中，並在循環完成迭代後將數組存儲在UserDefaults中。

if let items = json?["units"] as? [[String : Any]] { 
    var latitudes = [String]() 
    var longitudes = [String]() 
    var devids = [String]() 
    var devnames = [String]()  
    var speeds = [String]() 
    var statustts = [String]() 
    var drivernames = [String]() 
    var addresses = [String]() 

    for item in items { 
     let lat = item["latitude"] as? String 
     latitudes.append(lat)    

     let long = item["longitude"] as? String 
     longitudes.append(long) 

     let devid = item["devid"] as? String 
     devids.append(devid) 

     var devname = item["devname"] as? String 
     devnames.append(lat) 

     var speed = item["speed"] as? String 
     speeds.append(speed) 

     var statustt = item["status"] as? String 
     statuses.append(statustt) 

     var drivername = item["drivername"] as? String 
     drivernames.append(drivername) 

     var address = item["address"] as? String 
     addresses.append(address) 
    } 

    UserDefaults.standard.set(latitudes, forKey: "latitude") 
    UserDefaults.standard.set(longitudes, forKey: "longitude") 
    UserDefaults.standard.set(devids, forKey: "devid") 
    UserDefaults.standard.set(devnames, forKey: "devname") 
    UserDefaults.standard.set(speeds, forKey: "speed") 
    UserDefaults.standard.set(statustts, forKey: "statusxe") 
    UserDefaults.standard.set(drivername, forKey: "drivername") 
    UserDefaults.standard.set(addresses, forKey: "address") 
}