iOS SWIFT - JSON object nil after NSJSONSerialization - ios

Question

hello I am trying to read JSON as an array from the server not the dictionary. If I do this
let json: NSArray?
do {
json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! NSArray
print("json is \(json)")
}
json object comes nil through this code and also I can't access the variable like this json["code"] I have tried this too
NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as! NSArray
But If I don't specify any type and let the variable as AnyObject
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments)
print("json is \(json["code"]!)")
}
It works But 1st problem here is it prints Optional in the debugger but its least of my worries compared to that I can't do something like this
if json["code"] == 200 {
}
If I do this it says
Binary operator '==' cannot by applied to operands of type Anyobject? and Int
what I want is to get the data in NSArray. I don't want the json variable to be set as AnyObject. Inshort I want this code to work
let json: NSArray?
do {
json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! NSArray
print("json is \(json)")
}
if its possible. I don't know what I am doing wrong here
json:
{"code":200,"msg":"login success"}

Answer 1

If printing json["code"] works, then json is doubtless a dictionary.
JSONObjectWithData returns AnyObject that is
"I-have-no-idea-what-it-is-but-it-is-some-kind-of-object-and-not-a-value" (thanks to gnasher729 for the more accurate paraphrase of AnyObject)
Since you know the object is [String:AnyObject] cast the type
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! [String:AnyObject]
Then get the code – which is an Int – with
if json["code"] as! Int == 200 {
}
or with optional binding if the key is optional
if let code = json["code"] as? Int {
if code == 200 {
}
}