Multidimensional array/dictionary loop in Swift - ios

Question

I'm trying to loop through a multidimensional array/dictionary in Swift which I got from a JSON string. Originally I come from PHP so I'm probably a bit off with my approach.
My issue is that I can't seem to get into a sub-array/dict.
My code so far:
func getJSON(){
let url = NSURL(string: url)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary {
print(jsonObj!)
let array = jsonObj!.allKeys
for keys in array {
print(keys)
}
OperationQueue.main.addOperation({
//Nothing to do right now
})
}
}).resume()
}
My JSON:
{
"ArrayName1": {
"info": "This is my first array!",
"more": "Even more info!"
},
"ArrayName2": {
"info": "This is my second array!",
"more": "Even more info about the second array!"
}
}
The function prints the key (e.g. ArrayName1) which is good, but how do I get deeper into the array? To print the "info"?

Answer 1

If you are sure it's dictionary in this form [String: [String: Any]], you may want to try this.
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: [String: Any]] {
let array = jsonObj!.allKeys
for key in array {
print(key)
let info = jsonObj[key]["info"] as! String
}
}

Answer 2

First of all don't use NSURL in Swift 3. There is a native struct URL.
Second of all .allowFragments is useless as the JSON is clearly a collection type.
Third of all don't use NSDictionary in Swift, use native type Dictionary.
Fourth of all do the error handling at least the possible error passed by the data task.
All collection types are dictionaries. Use Fast Enumeration to parse keys and values. All keys and values are strings.
func getJSON(){
let url = URL(string: url)!
URLSession.shared.dataTask(with: url, completionHandler: {(data, response, error) -> Void in
if error != nil {
print(error!)
return
}
do {
if let jsonObj = try JSONSerialization.jsonObject(with: data!) as? [String:[String:String]] {
for (key, innerDictionary) in jsonObj {
print(key)
if let info = innerDictionary["info"] {
print("info", info)
}
}
DispatchQueue.main.async {
//Nothing to do right now
}
} else { print("The JSON object is not [String:[String:String]]") }
} catch {
print(error)
}
}).resume()
}