从视图控制器中的单元访问Firebase数据

问题描述

我现在有一个图片，三个UILabels和一个单元格中的TextView，并希望在单独的视图控制器中使用这些数据。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 （users）。child（uid！）。observeSingleEvent（of：.value，with：{（snapshot）in 
如果让dictionary = snapshot.value as？[String：AnyObject] {
 self .userLabel.text = dictionary [username] as？String 
} 
}）
  

解决方案

我实际上能够找到一种方法来做到这一点。实际上很简单

prepareForSegue

$ b

  override func prepare（for segue ：UIStoryboardSegue，发件人：任何？）{
如果segue.identifier ==showDetails{
如果let indexPath = self.postsTableView.indexPathForSelectedRow {
 let post = posts [indexPath.row]如！ [String：AnyObject] 
 let postDetails = post [postID] as？字符串
让controller = segue.destination as！ PostDetailsViewController 
 controller.postDetails = postDetails 
} 
} 
} 
  

PostDetailsViewController

  var postDetails：String？ 
 
覆盖func viewDidLoad（）{
 super.viewDidLoad（）
 //在加载视图之后执行其他任何设置。 
 
 FIRDatabase.database（）。reference（）。child（posts）。child（postDetails！）。observeSingleEvent（.value，其中：{（snapshot）in 
 if让dictionary = snapshot.value as？[String：AnyObject] {
 self.idLabel.text = dictionary [postID] as？String 
} 
}）
} 
  

I currently have a picture, three UILabels, and a TextView in a cell and would like to use that data in a separate view controller. The view controller is currently connected via a push segue to the cell, what should I do make this happen?

I have this but it doesn't work:

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
        }
    })

解决方案

I was actually able to find a way to do this. It's quite simple actually

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
        }
    })
}

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