The problem is when there is incomplete data NSJSONSerialization.JSONObjectWithData
is crashing the application giving unexpectedly found nil while unwrapping an Optional value
error instead of informing us using NSError variable. So we are unable to prevent crash.
You can find code we are using below
var error:NSError? = nil
let dataToUse = NSJSONSerialization.JSONObjectWithData(receivedData, options: NSJSONReadingOptions.AllowFragments, error:&error) as NSDictionary
if error != nil { println( "There was an error in NSJSONSerialization") }
Till now we are unable to find a work around.
Updated for Swift 3
let jsonData = Data()
do {
let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options:JSONSerialization.ReadingOptions(rawValue: 0))
guard let dictionary = jsonObject as? Dictionary<String, Any> else {
print("Not a Dictionary")
// put in function
return
}
print("JSON Dictionary! \(dictionary)")
}
catch let error as NSError {
print("Found an error - \(error)")
}
Swift 2
let JSONData = NSData()
do {
let JSON = try NSJSONSerialization.JSONObjectWithData(JSONData, options:NSJSONReadingOptions(rawValue: 0))
guard let JSONDictionary: NSDictionary = JSON as? NSDictionary else {
print("Not a Dictionary")
// put in function
return
}
print("JSONDictionary! \(JSONDictionary)")
}
catch let JSONError as NSError {
print("\(JSONError)")
}