在Swift中对Firebase数据进行“分组”排序

import Firebase

FirebaseApp.configure()

let databaseRef = Database.database().reference()

databaseRef.child("users").queryOrdered(byChild: "age").observeSingleEvent(of: .value, with: { (snapshot) in
    if let users = snapshot.value as? [String: Any] {
        // 对用户进行分组排序
        let sortedUsers = users.sorted { (user1, user2) -> Bool in
            let age1 = (user1.value as! [String: Any])["age"] as! Int
            let age2 = (user2.value as! [String: Any])["age"] as! Int
            return age1 < age2
        }
        
        // 输出排序后的用户信息
        for user in sortedUsers {
            let name = (user.value as! [String: Any])["name"] as! String
            let age = (user.value as! [String: Any])["age"] as! Int
            print("Name: \(name), Age: \(age)")
        }
    }
})