Fetch random order of query in Firebase and Swift

Question

What is the best way to randomly sort a list of objects after you have fetched all the data? I've only been able to fetch the data, but don't know how to randomly sort it.

Firebase structure: questions --> id: 1

Function to fetch all objects:

func fetchQuestions(completion: @escaping ([UserModel])->()) {
        
    let postRef = self.databaseRef.child("questions")
        postRef.observeSingleEvent(of: .value, with: { (poster) in
        
            var resultsArray = [UserModel]()
            for post in poster.children {
            
                let post = UserModel(snapshot: post as? DataSnapshot)
               
                resultsArray.append(post)
                    
        }
        
        completion(resultsArray)
        
    }) { (error) in
        print(error.localizedDescription)
    }
    
}

Answer 1

等待大神答复