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iOS Build a Weather App with Swift (Retired) Concurrency Working With JSON

Posted by Matthew Giuliano
Matthew Giuliano
2,749 Points

Coding Challenge

I'm having trouble with this coding challenge could someone help me out?

Thanks

json.swift 
// We've already created a NSData object with some json encoded data for you
import Foundation

let jsonString : NSString = "{\"results\": \"success\"}"
let userCourseDictionary : NSDictionary = NSJSONSerialization.JSONObjectWIthData(dataObject!, option: nil, error: nil)


// Now you just need to decode it

2 Answers

Chris Shaw
Chris Shaw
26,676 Points

Hi Matthew,

You have a couple of problems with the code you've provided, they are:

  1. You're missing the userCourseData constant that was originally there
  2. JSONObjectWIthData isn't correct, you have a capital I in the word With which needs to be lowercase
  3. You're referencing dataObject instead of userCourseData
  4. You don't need to unwrap the NSData object as it's already unwrapped in userCourseData
  5. option should be pural, i.e options
  6. You haven't downcasted userCourseDictionary as anNSDictionary which is required
let jsonString : NSString = "{\"results\": \"success\"}"
let userCourseData : NSData = jsonString.dataUsingEncoding(NSUTF8StringEncoding)!
let userCourseDictionary = NSJSONSerialization.JSONObjectWithData(userCourseData, options: nil, error: nil) as NSDictionary

Happy coding!

Ezekiel Elin
Ezekiel Elin
3,839 Points
Ezekiel Elin
Ezekiel Elin
3,839 Points

I believe you need to cast it as an NSDictionary, then do

if let key = userCourseDictionary["key"] {
    //Some Code
}

Note that in Swift 1.2 Beta, you can put multiple let statements in one if block, to prevent unneeded indenting.