如何在Swift 2中解析JSON？

Question

I have a PHP web api that returns json in the following format:

{"users":[
   {"user": {id:"1","name":"ahmad"}},
   ...

]}

In my Swift 2 code, I am able to retrieve the data above store it in an NSArray named users

Now, I need to iterate throw each user to convert it into an object:

for user in users {
    print("found: \(user)")
}

That ouputs something like:

found: {
    user =     {
        id = 1;
        name = ahmad;
    };
}

but when I try to access any element of that object I get an error:

let id  = user["user"]["id"]     //does not work: Xcode wont compile
let id2 = user["user"]!["id"]!   //does not work: Xcode wont compile
let id3 = user!["user"]!["id"]!  //does not work: Xcode wont compile

Then I tried :

if let u=user["user"] {     //does not work: Xcode wont compile
    // do somthing
}

I put a break point at print("\\(user)") to see what is going on, and here is what I found:

When I print the description of each individual user I get:

How can I access the elements of this JSON data in Swift 2?

Answer 1

A NSArray only holds AnyObject so you have to cast it (to Array<Dictionary<String, Dictionary<String, String>>> . Below you see the shorthand):

// this is a forced cast and you probably get runtime errors if users cannot be casted
for user in users as! [[String : [String : String]]] {
    print("found: \(user)")
}