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loop through json result in Xcode

Posted on 2015-01-13
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Last Modified: 2015-02-12
Hi,
I have some working code the reads two JSON values and displays them:
class ViewController: UIViewController {
  @IBOutlet weak var dateLabel: UILabel!
  @IBOutlet weak var timeLabel: UILabel!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    // 1
    let urlAsString = "http://date.jsontest.com"
    let url = NSURL(string: urlAsString)!
    let urlSession = NSURLSession.sharedSession()
    
    //2
    let jsonQuery = urlSession.dataTaskWithURL(url, completionHandler: { data, response, error -> Void in
      if (error != nil) {
        println(error.localizedDescription)
      }
      var err: NSError?
      
      // 3
      var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
      if (err != nil) {
        println("JSON Error \(err!.localizedDescription)")
      }
      
      // 4
      let jsonDate: String! = jsonResult["date"] as NSString
      let jsonTime: String! = jsonResult["time"] as NSString
      
      dispatch_async(dispatch_get_main_queue(), {
        self.dateLabel.text = jsonDate
        self.timeLabel.text = jsonTime
      })
    })
    // 5
    jsonQuery.resume()
  }

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The JSON it uses is :
{
   "time": "08:05:21 AM",
   "date": "01-13-2015"
}

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I need to modify the code to loop through an array and don't know how, heres the JSON I need to loop through:

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[
{
   "time": "08:05:21 AM",
   "date": "01-13-2015"
},
{
   "time": "07:05:19 AM",
   "date": "01-13-2015"
},
{
   "time": "06:05:00 AM",
   "date": "01-13-2015"
},
]
the sample code only expects a flat JSON response, I need to loop through the array ..
Any help appreciated,
thanks
0
Comment
Question by:jellydeal
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1 Comment
 
LVL 19

Accepted Solution

by:
Shahan Ayyub earned 2000 total points
ID: 40547646
I would like to add some pointers in your code, but unfortunately i do not have swift setup right now. But will try my best to do what is possible:

This part:

    // 4
      let jsonDate: String! = jsonResult["date"] as NSString
      let jsonTime: String! = jsonResult["time"] as NSString
      
      dispatch_async(dispatch_get_main_queue(), {
        self.dateLabel.text = jsonDate
        self.timeLabel.text = jsonTime
      })

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requires modification something like:

// Here `start` should be zero to access first element of json array
// Here `end`  should be (number of elements in array - 1), may be `count` property can help you.
for i in start..<end     
 {
     // 4
     //  let jsonDate: String! = jsonResult["date"] as NSString
     // let jsonTime: String! = jsonResult["time"] as NSString
     // Here access values like
     // jsonResult[i]["date"]       
     // jsonResult[i]["time"]      
     // Save this value in your modal objects or in array, dictionary etc
     // So you may use it to show in controls e.g., UITableView

      // Here once you are done dealing with parsing the datasource transfer control to the main thread
      // So it would be able to display relevant result sets.
      dispatch_async(dispatch_get_main_queue(), {
        //self.dateLabel.text = jsonDate
        //self.timeLabel.text = jsonTime
        // If you have one label for date and time then select the appropriate from the above parsed datasource
        // e.g.,  self.dateLabel.text = yourParsedArray[0]["date"]; // assume you save it like "array of dictionary"
        //e.g.,   yourParsedArray[0] = new dictionary ("date", "13-01-2015", "time", "00:00:00");
      })
 }

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May be this guideline could help you.
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