Cannot convert jsonArray element to integer - ios

Question

do{
let resultJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions())
let arrayJSON = resultJSON as! NSArray
let success:NSInteger = arrayJSON["success"] as! NSInteger
if (success == 1 ) ....
json data is the response from the server, i am trying to convert it to integer but i get the conversation error.

Answer 1

This is a working exmaple (tested on my machine)
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let data = data{
print("data =\(data)")
do{
let resultJSON = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions())
let resultDictionary = resultJSON as? NSDictionary
let success = resultDictionary!["success"]!
let successInteger = success as! Int
print("success = \(success)")
if successInteger == 1 {
print("yes")
}else{
print("no")
}
}catch _{
print("Received not-well-formatted JSON")
}
}
if let response = response {
print("url = \(response.URL!)")
print("response = \(response)")
let httpResponse = response as! NSHTTPURLResponse
print("response code = \(httpResponse.statusCode)")
}
})
task.resume()
where the response is:
{ "error_message" : "No User", "success" : 0}
Note
you said that your server responnes as:
{ "error_message" = "No User"; success = 0; }
and this is not a valid json, you should correct it to match the json that i gave to you

Answer 2

You're casting resultJSON as an NSArray but then you try to use it as a dictionary by subscripting "success".
If the response is a dictionary, then cast the result as a dictionary:
let result = resultJSON as! NSDictionary
let success = result["success"] as! NSInteger
If the response is an array of dictionaries, then first select one of the items before subscripting.
let arrayJSON = resultJSON as! NSArray
let success = arrayJSON[0]["success"] as! NSInteger
Note: when possible, prefer using Swift's typed arrays an dictionaries rather than Foundation's NSArray and NSDictionary. Also you should avoid force casting with !, it's better to unwrap optionals safely with if let ... = ... as? ... or any other mechanism.
Update
Here's an example:
do {
let resultJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions())
var success = 0
if let dictJSON = resultJSON as? [String:AnyObject] {
if let successInteger = dictJSON["success"] as? Int {
success = successInteger
} else {
print("no 'success' key in the dictionary, or 'success' was not compatible with Int")
}
} else {
print("unknown JSON problem")
}
if success == 1 {
// yay!
} else {
// nope
}
In this example I'm using a Swift dictionary [String:AnyObject] instead of an NSDictionary, and I'm using a Swift integer Int instead of Foundation's NSInteger. I'm also typecasting with if let instead of forcing.