JSON conversion in swift

Question

I am trying to convert some obj-c code to swift specifically part that handles JSON to swift conversion.

I have a JSON string

[{"ID":"1","Field1":"666666","Field2":"111111","Field3":"1","Field4":"30"},
 {"ID":"59","Field1":"SCJtDKw","Field2":"dwdSQz8v","Field3":"1","Field4":"1"}]

How can i convert this either into Array or dictionary?

I have tried

var ProductList : NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.AllowFragments, error:&jsonerror) as NSDictionary

but this crashes on line:

0x1059ea662:  nopw   %cs:(%rax,%rax)

I have also tried converting it as an array

var ProductList : NSArray = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.AllowFragments, error:&jsonerror) as NSArray

This line gets further but then crashes on the following line (immediately after the above line)

 var ReturnValue : NSMutableArray = ProductList.objectAtIndex(0) as NSMutableArray

Rob · Accepted Answer · 2014-12-15 16:56:30Z

2

Your JSON is an array of dictionaries (the outer square brackets is the array; the curly braces represent the dictionaries). So you want the NSJSONSerialization line to be cast as array. And when you grab the first item, that's a dictionary, so you should cast it as such (not an array).

let productList = NSJSONSerialization.JSONObjectWithData(data, options: nil, error:&jsonerror) as NSArray
let returnValue = productList.objectAtIndex(0) as NSDictionary

If you want, you could use Swift array of dictionaries, too:

if let productList = NSJSONSerialization.JSONObjectWithData(data, options: nil, error:&jsonerror) as? [[String: AnyObject]] {
    let returnValue = productList[0]
    // use returnValue here
} else {
    println("JSONObjectWithData error: \(jsonerror)")
}

This second example also uses the if let optional binding to gracefully handle errors.

edited Dec 15, 2014 at 16:56

answered Dec 15, 2014 at 14:48

Rob

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