Making a JSON object in Swift

Question

I'm trying to send JSON data to a server from my iOS app. I found a tutorial on this link.
How should the "obj: AnyObject" look like so that this method can be called:

NSJSONSerialization.dataWithJSONObject(obj: AnyObject, options: NSJSONWritingOptions, error: NSErrorPointer)

It doesn't accept Dictionary (even though it is somehow used in the example on the link above) or Array.

fpg1503 · Accepted Answer · 2018-08-07 17:08:01Z

4

Let's assume you have a dictionary like

let dictionary = ["key1": "value1", "key2": "value2"]

To generate your JSON Data using the method you provided you just call it:

var jsonGenerationError: NSError?
let jsonData = NSJSONSerialization.dataWithJSONObject(dictionary, options: .PrettyPrinted, error: &jsonGenerationError)

You can verify it worked by parsing the generated data:

var jsonParsingError: NSError?
let parsedObject: AnyObject? = NSJSONSerialization.JSONObjectWithData(jsonData!, options: .AllowFragments, error:&jsonParsingError)

Swift 4

let dictionary = ["key1": "value1", "key2": "value2"]
let jsonData = try? JSONSerialization.data(withJSONObject: dictionary, options: .prettyPrinted)
// Verifying it worked:
let parsedObject = try! JSONSerialization.jsonObject(with: jsonData!, options: .allowFragments)

edited Aug 7, 2018 at 17:08

answered Feb 1, 2015 at 14:46

fpg1503

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1 Comment

Amer Hukic Over a year ago

Thank you. The problem was that I didn't finish writing the method and the error appeared, even though it was a valid object (in this case dictionary) that I was passing as the first argument.

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