CODEWITHSUNDEEP
iosjsonswiftswift2alamofire
Matt Hammond
Matt Hammond

Reputation: 785

Alamofire JSON Request not pulling the data from a server

Im using Alamofire to pull a JSON file from a server (http://midlandgates.co.uk/JSON/reliveCacheData.json). To do this I have an Alamofire Request function which should pull the data down and write it to a class called JSONDataClass.

Alamofire Request

Alamofire.request(.GET, "http://midlandgates.co.uk/JSON/reliveCacheData.json")
            .response { request, response, data,  error in

                if let data = data {
                    let json = JSON(data:data)

                    for locationData in json {
                        let locationDataJSON = JSONDataClass(json: locationData.1)
                        self.cacheData.append(locationDataJSON)
                    }

                    for title in self.cacheData {
                        print(title.memoryTitle)
                    }
                }

        }

However my printLn isn't printing the data from the JSON File which indicates there is a problem with either the request or the class. However I'm new to swift and can't seem to work out the problem, all help is appreciated!

Class 

import Foundation
import CoreLocation
import SwiftyJSON

class JSONDataClass {

    //Location MetaData
    var postUser: String!
    var memoryTitle: String!
    var memoryDescription: String!
    var memoryType: String!
    var memoryEmotion: String!
    var taggedFriends: String!

    //Location LocationalData
    var memoryLocation: CLLocationCoordinate2D

    //MultiMedia AddressData
    var media1: String!
    var media2: String!
    var media3: String!
    var media4: String!
    var media5: String!

    //Writing to varibles
    init(json: JSON) {
        postUser = json["user"].stringValue
        memoryTitle = json["title"].stringValue
        memoryDescription = json["description"].stringValue
        memoryType = json["type"].stringValue
        memoryEmotion = json["emotion"].stringValue
        taggedFriends = json["friends"].stringValue

        memoryLocation = CLLocationCoordinate2D(latitude: json["latitude"].doubleValue, longitude: json["longitude"].doubleValue)

        media1 = json["media1"].stringValue
        media2 = json["media2"].stringValue
        media3 = json["media3"].stringValue
        media4 = json["media4"].stringValue
        media5 = json["media5"].stringValue
    }
}

Upvotes: 2

Views: 1093

Answers (3)

Dan Beaulieu
Dan Beaulieu

Reputation: 19964

(Note: the author of the JSON content has fixed his JSON based on my answer - my answer was correct at the time of this post).

The problem is that you've got invalid JSON coming back from the server.

I switched your SwiftyJSON code out and wrapped it in a try-catch which illuminated the problem:

Alamofire.request(.GET, "http://midlandgates.co.uk/JSON/reliveCacheData.json")
            .response { request, response, data,  error in
                //print("status \(response)")

            do {

                let myData = try NSJSONSerialization.JSONObjectWithData(data!,
                    options: .MutableLeaves)

                print(myData)
            } catch let error {
                print(error)
            }
        }

And I get the following error:

2015-12-30 13:47:06.129 {{ignore}}[10185:2174510] Unknown class log in Interface Builder file. Error Domain=NSCocoaErrorDomain Code=3840 "Unescaped control character around character 961." UserInfo={NSDebugDescription=Unescaped control character around character 961.}

This error basically means that you have invalid JSON coming back from the server.

Make sure your json is valid by running it through JSONLint:

http://jsonlint.com

Upvotes: 3

user3441734
user3441734

Reputation: 17572

After I checked the discussion and the data provided by the server from you link, I can say, that your trouble is how to deal with your JSON (class, or struct, or enum??)

Did you follow some tutorial from SwiftyJSON? While your init(json: JSON) in class JSONDataClass seems to accept some JSON object (aka dictionary), in reality your json is an JSON array! Check SwiftyJSON documentation and take in your account, that you received an array.

try this instead: 

for d in json { 
    let locationDataJSON = JSONDataClass(json: d)  
    self.cacheData.append(locationDataJSON) 
}

and see, that locationDataJSON is NOT location data but one json object from the received array. or just remove .1 in locationData.1

For example:

Alamofire.request(.GET, "http://midlandgates.co.uk/JSON/reliveCacheData.json")
    .response { request, response, data,  error in

        if let data = data {
            let json = JSON(data:data)

            for locationData in json {
                let locationDataJSON = JSONDataClass(json: locationData)
                self.cacheData.append(locationDataJSON)
            }

            for title in self.cacheData {
                print(title.memoryTitle)
            }
        }

}

Upvotes: 2

Joshua Nozzi
Joshua Nozzi

Reputation: 61238

Are you new to debuggers and breakpoints?

Set a breakpoint in your response closure (for example, in your if let data = data { line) and step through your code to see if it does what you expect at every stage. Maybe error is set? Maybe the if let data = data { conditional failed (you're not doing anything in an else to log the failure, so how could you know?)...

Upvotes: 2

Related Questions