ios - Firebase 在 Swift 3 中访问快照值错误

Question

我最近升级到 swift 3，在尝试从快照观察事件值访问某些内容时遇到错误。

我的代码:

ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in

    let username = snapshot.value!["fullName"] as! String
    let homeAddress = snapshot.value!["homeAddress"] as! [Double]
    let email = snapshot.value!["email"] as! String
}

错误与上述三个变量有关，并指出:

类型 'Any' 没有下标成员

任何帮助将不胜感激

Answer 1

我认为您可能需要将 snapshot.value 转换为 NSDictionary。

ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in

    let value = snapshot.value as? NSDictionary

    let username = value?["fullName"] as? String ?? ""
    let homeAddress = value?["homeAddress"] as? [Double] ?? []
    let email = value?["email"] as? String ?? ""

}

您可以查看 firebase 文档:https://firebase.google.com/docs/database/ios/read-and-write