Extracting values from Json Data in Swift iOS9

Question

I have the following JSon Data retrieved from the server and i want to extract the value name and store them in an array or dictionary as a model in my app. The issue is that the value returned its self is in a form of another dictionary. How can i extract values of frequency,description and amount and update them to my tableview. Below is my Json Data format that i get from the server request. I am new to swift and the concept of dictionaries and Arrays is quiet confusing to me

{
"payment" =     (
            {
        amount = 100;
        currency = USD;
        description = "Awesome Videos";
        frequency = Day;
    },
            {
        amount = 500;
        currency = USD;
        description = "Awesome Videos";
        frequency = Week;
    },
            {
        amount = 3000;
        currency = USD;
        description = "Awesome Videos";
        frequency = Months;
    }
);

}

I want to store them locally in a dictionary or an array, and update them to my tableview.

Here also is my code to fetch the data from server

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) -> Void in
        if (data != nil){
            print(data)
            do {

                // let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options:NSJSONReadingOptions.MutableContainers)
                let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)

                print(jsonResult)
                print(jsonResult["payment_plans"])



                if let plan_list = jsonResult as? NSDictionary{
                    print("got dictionary")

                    for (key, value) in plan_list
                    {
                        print(value)
                        print("printing keys")
                        print(key)

                        if let plans = value as? NSDictionary
                        {
                            print("printing values")
                            print(plans)
                            print(plans["currency"])
                        }
                    }
                }

            }   catch{
                print("Json Serialization failed")
            }
        }

    }
    /*
    if (response != nil){
    print(response)
    }
    else{
    print(error)
    }
    }
    */
    task.resume()
}

I am stuck here how to extract the values that i get in the dictionary. Thanks in advance

Sarabjit Singh · Accepted Answer · 2016-11-22 09:16:01Z

2

Hi You can iterrate your result as following:

if((jsonResult) != nil) {
    let swiftyJsonVar = jsonResult!
    do {
       if let dicObj = swiftyJsonVar as? NSDictionary {
           print("Response is dictionary")
           print(dicObj)
           let arrObj = dicObj["payment"] as NSArray
            // Then iterate your arrObj and do as per your need.
            //for eg.
           arrObj[0]["description"]
        }
    }
}

edited Nov 22, 2016 at 9:16

answered Nov 22, 2016 at 9:06

Sarabjit Singh

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5 Comments

Arnold Over a year ago

This returns a fatal error "unexpectedly found nil while unwrapping an Optional value" the 'dicObj["payment"]' returns nil

Sarabjit Singh Over a year ago

you can use like this .. dicObj["payment"] as! NSArray

Arnold Over a year ago

I got it to work....thank you, can you recommend how i can populate the above data in the tableviewcell? It seems not working on my side. Here is my code

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {         let cell = tableView.dequeueReusableCellWithIdentifier("choosePlan", forIndexPath: indexPath) as!UITableViewCell         cell.textLabel?.text = PlanStorage[indexPath.row]         return cell     }

Sarabjit Singh Over a year ago

You can use like this to show values on your cell..... cell.textLabel?.text = PlanStorage[indexPath.row] [description]

Sarabjit Singh Over a year ago

And please check key before assigning to cell because it may be nil. If its nil then it may crash. So please make check for it....

Vadim Kozak · Accepted Answer · 2016-11-22 08:37:57Z

0

Dictionary it's a key-value storage where value in your case have AnyObject type.

To convert data into Dictionary or Array you can use

let jsonResult = try JSONSerialization.jsonObject(with: data, options: .mutableContainers)

then create payments array

if let payments = jsonResult as? Array{ 

     *iterate here all payments 

}

If you want to use for (key, value) in plan_list you need to change it's to for (key, value) in plan_list.enumerate()

answered Nov 22, 2016 at 8:37

Vadim Kozak

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9 Comments

Arnold Over a year ago

I managed to get the Json Data....Any idea how i can populate the data into the tableview? Seems not to work on my side. Thanks

Vadim Kozak Over a year ago

create a property payments in your class

Vadim Kozak Over a year ago

sorry, then put all data to payments property and call reloadData() in table view dataSource methods you can get data using 'if let payment = self.payments as? NSDictionary { cell.label.text = payment["description"] as? String}' don't forget you have a integer also!

Arnold Over a year ago

I tried to call reloadData in every datasource method self.PlanStorage.append(display_price) self.PlanStorage.append(display_name) Here PlanStoage is where am storing the data and is of an array of strings. ` cell.textLabel?.text = PlanStorage[indexPath.row] ` This is the code to populate the data but is not working

Arnold Over a year ago

func numberOfSectionsInTableView(tableView: UITableView) -> Int {         tableView.reloadData()         return 1;     }     func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {         tableView.reloadData()         return PlanStorage.count     }

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