12.4 C
Saturday, October 28, 2023

ios – Alamofire No precise matches in name to class technique ‘jsonObject’

The compiler error is

No precise matches in name to class technique 'jsonObject'

So it means, that JSONSerialization, has a static technique that look alike, however it’s not the identical.

So whenever you encounter this difficulty, it is normally a typo or dangerous kind.
In your case, it is dangerous sorts.

Let’s begin by examine the kind of response.
You would possibly must remark the traces that causes the error first.
Mouse over the response, preserve Choice key tapped (the cursors transforms right into a query mark), after which click on on response.
You may get its kind: AFDataResponse<Information?>.

Now, let’s have a look at JSONSerialization doc, and it has these two strategies (I strongly guess you need the primary one):

class func jsonObject(with: Information, choices: JSONSerialization.ReadingOptions) -> Any

class func jsonObject(with: InputStream, choices: JSONSerialization.ReadingOptions) -> Any

See the difficulty?

Information != AFDataResponse<Information?>

To entry the Information object from response, it is with response.knowledge:

let json = strive JSONSerialization.jsonObject(with: response.knowledge!, choices:.allowFragments) as! Dictionary<String, Dictionary<String, Any>>

Unrelated, however since it is a SO query, we are likely to usually go strictly to the difficulty, however I observed a number of issues although, and I would not need somebody to duplicate them when studying.

Now, you’re utilizing drive unwrap (use of !), if there is a matter: response.knowledge being nil, json not being a Dictionary<String, Dictionary<String, Any>>, it can crash, simply in your info.

catch let error as NSError could be changed with simply catch

choices:.allowFragments just isn’t wanted. To be wanted, the JSON must be only a Bool, a String, or a Quantity. In different phrases, at prime degree it is not an Array nor a Dictionary.

You may also wish to examine the success or not of the response, else the entire response may be completely different, after which, it may not be a Dictionary<String, Dictionary<String, Any>> and can crash. We would think about responding a 500 error with a HTML error code, and also you as! will make it crash.

So, I would write it that method:

AF.request(webservice, headers: headers).authenticate(with: credential).response { response in
    change response.end result {
    case .success(let knowledge):
        do {
            guard let knowledge = knowledge else { print("Success, however empty response"); return }
            let json = strive JSONSerialization.jsonObject(with: knowledge)
            guard let jsonDict = json as? [String: [String: Any]] else {
                print("JSON just isn't a [String: [String: Any]]: (json)")
            //Use jsonDict
        } catch {
            print("Error whereas decoding: (error)")
    case .failure(let error):
        print("Error: (error)")

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