ios - 我无法获取 snapshot.key swift ios

Question

此代码获取值 snap(电子邮件、姓名)。我需要获取 key (RxLV2i1)。怎么改代码？

FIRDatabase.database().reference().child("users").observe(.childAdded, with: { (snapshot) in
            if let dictionary = snapshot.value as? [String: AnyObject]{
                let user = Subject()
                user.setValuesForKeys(dictionary)
                self.subjects.append(user)
                DispatchQueue.main.async(execute: {
                    self.tableView.reloadData()
                })
            }    }, withCancel: nil)

例如:

Snap (RxLV2i1) {
     email = "Test1@gmail.com";
     name = "Test1 test1";
}

当我从 snapshot.value 更改为 snapshot.key - 显示消息:

Cast from 'String?!' to unrelated type '[[String : AnyObject]]' always fails

Answer 1

如果你想获取快照 key ，就这样做

 let key = snapshot.key
 print(snapshot.key)

在您的代码中....

FIRDatabase.database().reference().child("users").observe(.childAdded, with: { (snapshot) in
        if let dictionary = snapshot.value as? [String: AnyObject]{
            let user = Subject()
            user.setValuesForKeys(dictionary)

  // Also if you add another variable called 'id' to your user object, you can set that as well to 'user.id = snapshot.key'
            let key = snapshot.key
            print(snapshot.key)

            self.subjects.append(user)
            DispatchQueue.main.async(execute: {
                self.tableView.reloadData()
            })
      }    }, withCancel: nil)