Issue Getting NSData Request To Work In Swift 2.0 - nsdata

Question

I'm hoping someone may be able to help me figure out a snafu I'm having with an app I am trying to write (or learn to write) in Swift 2.0. This previously worked in Swift 1.2, but after the necessary conversions, I am continunally facing the error;
Cannot invoke initializer of type 'NSData' with an argument list of type '(contenOfURL: NSURL, options: NSDataReadingOptions, error:nil)'
Here is my code, slightly truncated, that I am using;
...
class func fetchMinionData() -> [Minion] {
let myURL = "https://myurl/test.json"
let dataURL = NSURL(string: myURL)
let data = NSData(contentsOfURL: dataURL!, options: NSDataReadingOptions.DataReadingMappedIfSafe, error: nil)
//THIS IS THE LINE THAT THROWS THE ERROR
let minionJSON = JSON(data)
var minions = [Minion]()
for (_ , minionDictionary) in minionJSON {
minions.append(Minion(minionDetails: minionDictionary))
}
return minions
}
...
Note that I plan to use the SwiftyJSON library to further parse the data once it is downloaded. I am searching endlessly online, but I just can't seem to figure this out! Thank you!

Answer 1

If you are working with Swift 2, you should not pass the last argument "error". Instead put a try around the NSData initialization. If data needs to be accessed outside take the init result in a var and convert to let Modified code
var optData:NSData? = nil
do {
optData = try NSData(contentsOfURL: dataURL!, options: NSDataReadingOptions.DataReadingMappedIfSafe)
}
catch {
print("Handle \(error) here")
}
if let data = optData {
// Convert data to JSON here
}

Answer 2

Example code for Dictionary :) Swift 2.0
https://github.com/DaRkD0G/LoadExtension/edit/master/LoadExtensionDictionary.swift
enum EHError: ErrorType {
case Nil(String)
case NSData(String)
case JSON(String)
}
extension Dictionary {
/**
Loads a JSON file from the app bundle into a new dictionary
- parameter filename: File name
- throws: PathForResource / NSData / JSON
- returns: Dictionary<String, AnyObject>
*/
static func loadJSONFromBundle(filename: String) throws -> Dictionary<String, AnyObject> {
guard let path = NSBundle.mainBundle().pathForResource(filename, ofType: "json") else {
throw EHError.Nil("[EasyHelper][loadJSONFromBundle][->pathForResource] The file could not be located\nFile : '\(filename).json'")
}
guard let data = try? NSData(contentsOfFile: path, options:NSDataReadingOptions()) else {
throw EHError.NSData("[EasyHelper][loadJSONFromBundle][->NSData] The absolute path of the file not find\nFile : '\(filename)'")
}
guard let jsonDict = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions()) as? Dictionary<String, AnyObject> else {
throw EHError.JSON("[EasyHelper][loadJSONFromBundle][->NSJSONSerialization]Error.InvalidJSON Level file '\(filename)' is not valid JSON")
}
return jsonDict
}
}
If I do not do a mistake, for you is that
/**
Loads a JSON file from the app bundle into a new dictionary
- parameter filename: File name
- throws: EHError : PathForResource / NSData / JSON
- returns: [String : AnyObject]
*/
static func loadJSONFromBundle(filename: String, nameJson:String) throws -> [String : AnyObject] {
guard let path = NSBundle.mainBundle().pathForResource(filename, ofType: "json") else {
throw EHError.Nil("[EasyHelper][loadJSONFromBundle][->pathForResource] The file could not be located\nFile : '\(filename).json'")
}
guard let data = try? NSData(contentsOfFile: path, options:NSDataReadingOptions()) else {
throw EHError.NSData("[EasyHelper][loadJSONFromBundle][->NSData] The absolute path of the file not find\nFile : '\(filename)'")
}
guard let jsonDict = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as? [String : AnyObject] else {
throw EHError.JSON("[EasyHelper][loadJSONFromBundle][->NSJSONSerialization] Invalid JSON\n nameJson '\(nameJson)'\nFile '\(filename)'")
}
return jsonDict
}