Swift 3 problems Parsing json response - php

Question

I am new on Swift but I was follwoing some examples like how to make a login app sending username and password fields to a php file and getting the json response back.
When I print my responseString I get:
[{"userid":1,"username":"rodrigo","password":"minhoca","groupname":"couple"}]
But when I try to parse the json I never can set the username variable because never gets into that part of the code, I just get "here"
Thanks for the help
func sendLoginInfo(username: String, password: String) -> String{
if let url = URL(string: "myphpurl"){
let request = NSMutableURLRequest(url:url)
request.httpMethod = "POST";// Compose a query string
let postString = "?username=\(myUsername)&password=\(myPassword)"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with:request as URLRequest){
data, response, error in
if error != nil{
print("1\(error)")
}
else{
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("response string = \(responseString!)")
}
do {
if let convertedJsonIntoDict = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary {
// Print out dictionary
print(convertedJsonIntoDict)
// Get value by key
let firstNameValue = convertedJsonIntoDict["username"] as? String
print("here = \(firstNameValue!)")
}
else{
print("here")
}
} catch let error as NSError {
print(error.localizedDescription)
}
}
task.resume()
}
return ""
}

Answer 1

Change the NSDictionary to NSArray in your code because you are getting an array and trying to convert to dictonary:
if let convertedJson = try JSONSerialization.jsonObject(with: data!, options: []) as? NSArray
get the object at index 0 which will give you dictonary & then you can get username
So the Final code will be:
func sendLoginInfo(username: String, password: String) -> String{
if let url = URL(string: "myphpurl"){
let request = NSMutableURLRequest(url:url)
request.httpMethod = "POST";// Compose a query string
let postString = "?username=\(myUsername)&password=\(myPassword)"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with:request as URLRequest){
data, response, error in
if error != nil{
print("1\(error)")
}
else{
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("response string = \(responseString!)")
}
do {
if let convertedJsonIntoDict = try JSONSerialization.jsonObject(with: data!, options: []) as? NSArray {
// Print out dictionary
print(convertedJsonIntoDict)
// Get value by key
let firstNameValue = (convertedJsonIntoDict[0] as! NSDictionary)["username"] as? String
print("here = \(firstNameValue!)")
}
else{
print("here")
}
} catch let error as NSError {
print(error.localizedDescription)
}
}
task.resume()
}
return ""
}