从视图控制器中的单元访问Firebase数据

我目前有一个图片，三个UILabels和一个单元格中的TextView，并希望在一个单独的视图控制器中使用该数据。 视图控制器目前通过push segue连接到单元格，我该怎么做才能做到这一点？

我有这个，但它不起作用：

let uid = FIRAuth.auth()?.currentUser?.uid FIRDatabase.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in if let dictionary = snapshot.value as? [String: AnyObject] { self.userLabel.text = dictionary["username"] as? String } }) 

Answer 1

将typesDictionary的存储variables添加到源VC和目标VC：var userdata：Dictionary！ 或者你可以初始化一个空字典let userdata = String：Any

然后，将快照转换为字典后，将源VC用户数据设置为字典数据并执行search

 if let dictionary = snapshot.value as? [String: AnyObject] { self.userLabel.text = dictionary["username"] as? String self.userdata = dictionary self.performSegue(withIdentifier: "<segueIDHere>", sender: self) } 

然后在源VC中实现VC准备segue方法来传递数据：

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "<segueIDHere>" { let destinationVC = segue.destination as! <ClassNameofVCHere> destinationVC.userdata = self.userdata } } 

Answer 2

我实际上能够find一种方法来做到这一点。 实际上这很简单

prepareForSegue

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "showDetails" { if let indexPath = self.postsTableView.indexPathForSelectedRow { let post = posts[indexPath.row] as! [String: AnyObject] let postDetails = post["postID"] as? String let controller = segue.destination as! PostDetailsViewController controller.postDetails = postDetails } } } 

PostDetailsViewController

 var postDetails: String? override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. FIRDatabase.database().reference().child("posts").child(postDetails!).observeSingleEvent(of: .value, with: { (snapshot) in if let dictionary = snapshot.value as? [String: AnyObject] { self.idLabel.text = dictionary["postID"] as? String } }) }