HTTP Request GET JSON and read data - json

Question

i have a problem by a code of me in swift. I do a request to webserver by httpMethod POST. This request is ok. I get a response and data inside the data value. The data looks like JSON
{"pushValues": {"devicePushGlobal":"1","devicePushNewProducts":"1","devicePushNewOffer":"1"}}
Then I will load this response data to set buttons based on the response data. But i fail to write this code. Can someone help me please? :)
Error Code
Cannot invoke 'jsonObject' with an argument list of type '(with: NSString)'
// i tested with other options but i always fail :-(
I comment the error in the code ....
let url = "https://URL.php"
let request = NSMutableURLRequest(url: NSURL(string: url)! as URL)
let bodyData = "token=" + (dts)
request.httpMethod = "POST"
request.httpBody = bodyData.data(using: String.Encoding.utf8);
NSURLConnection.sendAsynchronousRequest(request as URLRequest, queue: OperationQueue.main) {
(response, data, error) in
// here i get the result of
// {"pushValues": {"devicePushGlobal":"1","devicePushNewProducts":"1","devicePushNewOffer":"1"}}
var str = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
var names = [String]()
// here i will get each value of pushValues to add to the array names
do {
if let data = str,
// ... and here is the error code by xcode ::: ==> Cannot invoke 'jsonObject' with an argument list of type '(with: NSString)'
// i tested with other options but i always fail :-(
let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
let blogs = json["pushValues"] as? [[String: Any]] {
for blog in blogs {
if let name = blog["devicePushGlobal"] as? String {
print(name)
names.append(name)
}
}
}
} catch {
print("Error deserializing JSON: \(error)")
}
// names array is empty
print(names)
}
Thank you for your help

Answer 1

You shouldn't decode the JSON response into an NSString using var str = NSString(data: data!, encoding: String.Encoding.utf8.rawValue). JSONSerialization.jsonObject() expects a Data object as an input argument, so just safely unwrap the optional data variable and use that as the input argument:
if let responesData = data, let json = try JSONSerialization.jsonObject(with: responseData) as? [String: Any], let blogs = json["pushValues"] as? [String: Any]
The full code using native Swift types:
...
let request = URLRequest(url: URL(string: url)!)
...
URLSession.shared.dataTask(with: request, completionHandler: {
(response, data, error) in
var names = [String]()
do {
if let responseData = data, let json = try JSONSerialization.jsonObject(with: responseData) as? [String: Any], let blogs = json["pushValues"] as? [String: Any]{
if let name = blog["devicePushGlobal"] as? Int {
print(name)
names.append(name)
}
if let newProducts = blog["devicePushNewProducts"] as? Int{}
if let newOffers = blog["devicePushNewOffers"] as? Int{}
}
} catch {
print("Error deserializing JSON: \(error)")
}
// names array is empty
print(names)
}).resume()