How to check if JSON is null in swift?

Question

I am currently working on an app which brings back json, in the following format

"location_subtype" = "somevalue"; "location_type" = Force; month = "2015-01"; "outcome_status" = { category = "somevalue"; date = "somevalue"; };

if the "outcome_status" has value it shows category and date however if the "outcome_value" does not have any value(which is in most of the cases) it is shown as below

"location_subtype" = "somevalue"; "location_type" = Force; month = "2015-01"; "outcome_status" = ""; "persistent_id" = "";

The question is how can i check if the value for outcome_status is not "null"?

i have tried the following to store the category and date into label but it runs into error, the first if statement should check if the value is not null and if it is not go to next if statement. However it continues to next if statement and i get the following error

Thread 1: EXC_BAD_ACCESS(code=2, address=0x102089600)

if (dict["outcome_status"] != nil)
        {
            if ((dict["outcome_status"]as NSDictionary)["category"] != nil)
            {
                outcomeStatusLabel.text = ((dict["outcome_status"]as NSDictionary)["category"] as NSString)
                outcomeStatusLabel.font = UIFont.systemFontOfSize(14.0);
                outcomeStatusLabel.numberOfLines = 0
            }

            if ((dict["outcome_status"]as NSDictionary)["date"] != nil)
            {
                outcomeDateLabel.text = ((dict["outcome_status"]as NSDictionary)["date"] as NSString)
                outcomeDateLabel.font = UIFont.systemFontOfSize(14.0);
                outcomeDateLabel.numberOfLines = 0
            }
        }

If i remove the 1st if statement it only crashes when "outcome_status" = "null" and works perfectly fine if there some value in "outcome_status"

What do i need to do so it stops at 1st if statement if the value is = null?

Thank you in advance.

Answer 1

in case you are using Alamofire and JSONSubscriptType use this:

if !(parsedJSON["someKey"] == JSON.null) {
//do your stuff 
}

Answer 2

if ((nullObject as? NSNull) == nil)  {
        ...
       }