问题
I'm learning JSON. I have problem with parsing JSON from URL. The error is "Error Domain=NSCocoaErrorDomain Code=3840 "No value." UserInfo={NSDebugDescription=No value.}"
JSON is valid - I've checked. This is structure of JSON:
[{"id":33,"name":"5","sort":2},{"id":34,"name":"6","sort":3},{"id":35,"name":"7","sortOrder":4}]
And this is my code: import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let urlAsString = "http://www.url.address/"
let url = NSURL(string: urlAsString)!
let urlSession = NSURLSession.sharedSession()
let username = "admin"
let password = "admin"
struct Address {
let name: String?
let id: String?
let sortOrder: String?
init(dict: [String: AnyObject]) {
name = dict["name"] as? String
id = dict["id"] as? String
sortOrder = dict["sort"] as? String
}
}
let path = NSBundle.mainBundle().pathForResource("sections", ofType: "json")
let jsonData = NSData()
do {
if let jsonDic = try NSJSONSerialization.JSONObjectWithData(jsonData,
options: .MutableContainers) as? [String: AnyObject] {
let addr = Address(dict: jsonDic)
print("jsonDic")
}
} catch let error as NSError {
print(error)
}
}
func backButton(sender: AnyObject) {
self.dismissViewControllerAnimated(true, completion: {})
}
}
回答1:
You need to actually use the data from the file:
guard let path = NSBundle.mainBundle().pathForResource("sections", ofType: "json"),
let jsonData = NSData(contentsOfFile: path) else {
fatalError("Cannot find or load the sections file in the main bundle")
}
do {
if let sections = try NSJSONSerialization.JSONObjectWithData(jsonData,
options: .MutableContainers) as? [String: AnyObject] {
// work with sections
}
...
来源：https://stackoverflow.com/questions/36462298/error-domain-nscocoaerrordomain-code-3840-no-value-userinfo-nsdebugdescripti