swift - Firebase swift 4 : iterate through observe results

Question

我有这个数据

我需要检索节点类别的数据。我尝试了这段代码

database?.child("restaurants/erbil/Today/category").observe(.childAdded, with: { (snapshot) in
        for child in snapshot.children.allObjects as! [DataSnapshot] {
               print(" output            \(String(describing: child.value))")
        }
    })

但我只会返回 Burgers 节点的数据这是输出

Answer 1

您当前的代码循环遍历类别，为您提供 DataSnapshot object对于每个类别。然后，您需要从每个子快照中获取单独的 key 和属性，例如:

database?.child("restaurants/erbil/Today/category").observe(.childAdded, with: { (snapshot) in
    for child in snapshot.children.allObjects as! [DataSnapshot] {
       print(" key  \(child.key)")
       print(" name \(child.childSnapshot(forPath: "catName").value)")
    }
})