Fetching information from JSON file is unsuccessful

Question

Fetching information from JSON file is unsuccessful

Attempting to retrieve data from a JSON source (). The goal is to extract information about each game including goals, location, and teams. However, the current code implementation seems to be ineffective.

    let url = "http://www.openligadb.de/api/getmatchdata/bl1/2014/15"

    //parsing the URL

    if let JSONData = NSData(contentsOfURL: NSURL(string: url)!) {

        if let json = (try? NSJSONSerialization.JSONObjectWithData(JSONData, options: [])) as? NSDictionary {

             //processing the JSON data

        }
    }

The issue lies in the second if-statement (if let json = (try?...). Assistance would be greatly appreciated.

Code snippet for extracting data from dictionaries:

                    //Team 1 Data
                    if let team1 = object["Team1"] as? NSDictionary {

                            if let name = team1["TeamName"] as? String {
                                print("Name of Team 1: \(name)")
                            }
                            if let logo = team1["TeamIconUrl"] as? String {

                                print("Logo of Team 1: \(logo)")
                            }

                            // Additional processing goes here

                    }

json swift parsing

Answer 1

Answer №1

Understanding the structure of your JSON data is key: it begins with an array, not a dictionary.

This array contains dictionaries, each containing an array of dictionaries.

While it may seem complicated at first, simply follow the JSON structure and decode the values correctly based on their types.

In JSON, arrays start with [ and dictionaries start with { (note that this syntax differs from Swift's arrays and dictionaries).

Your code could look something like this:

do {
    let url = "http://www.openligadb.de/api/getmatchdata/bl1/2014/15"
    if let url = NSURL(string: url),
           JSONData = NSData(contentsOfURL: url),
           jsonArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: []) as? NSArray {
            for object in jsonArray {
                if let goalsArray = object["Goals"] as? NSArray {
                    // Each "goal" is a dictionary
                    for goal in goalsArray {
                        print(goal)
                        if let name = goal["GoalGetterName"] as? String {
                            print("Name: \(name)")
                        }
                        if let ID = goal["GoalID"] as? Int {
                            print("ID: \(ID)")
                        }
                        // And so on...
                    }
                }
            }
    }
} catch {
    print(error)
}

UPDATE: You're getting closer! However, "Team1" should be treated as a dictionary, not an array. :)

Here's the corrected code snippet:

do {
    let url = "http://www.openligadb.de/api/getmatchdata/bl1/2014/15"
    if let url = NSURL(string: url),
        JSONData = NSData(contentsOfURL: url),
        jsonArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: []) as? NSArray {
        for object in jsonArray {
            if let team1 = object["Team1"] as? NSDictionary {
                if let name = team1["TeamName"] as? String {
                    print("Name Team1: \(name)")
                }
                if let logo = team1["TeamIconUrl"] as? String {
                    print("Logo Team1: \(logo)")
                }
            }
        }
    }
} catch {
    print(error)
}

Answer 2

Understanding the structure of your JSON data is key: it begins with an array, not a dictionary.

This array contains dictionaries, each containing an array of dictionaries.

While it may seem complicated at first, simply follow the JSON structure and decode the values correctly based on their types.

In JSON, arrays start with [ and dictionaries start with { (note that this syntax differs from Swift's arrays and dictionaries).

Your code could look something like this:

do {
    let url = "http://www.openligadb.de/api/getmatchdata/bl1/2014/15"
    if let url = NSURL(string: url),
           JSONData = NSData(contentsOfURL: url),
           jsonArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: []) as? NSArray {
            for object in jsonArray {
                if let goalsArray = object["Goals"] as? NSArray {
                    // Each "goal" is a dictionary
                    for goal in goalsArray {
                        print(goal)
                        if let name = goal["GoalGetterName"] as? String {
                            print("Name: \(name)")
                        }
                        if let ID = goal["GoalID"] as? Int {
                            print("ID: \(ID)")
                        }
                        // And so on...
                    }
                }
            }
    }
} catch {
    print(error)
}

UPDATE: You're getting closer! However, "Team1" should be treated as a dictionary, not an array. :)

Here's the corrected code snippet:

do {
    let url = "http://www.openligadb.de/api/getmatchdata/bl1/2014/15"
    if let url = NSURL(string: url),
        JSONData = NSData(contentsOfURL: url),
        jsonArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: []) as? NSArray {
        for object in jsonArray {
            if let team1 = object["Team1"] as? NSDictionary {
                if let name = team1["TeamName"] as? String {
                    print("Name Team1: \(name)")
                }
                if let logo = team1["TeamIconUrl"] as? String {
                    print("Logo Team1: \(logo)")
                }
            }
        }
    }
} catch {
    print(error)
}

Fetching information from JSON file is unsuccessful

Answer №1

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