ios - 我想念在 firebase 中解析 JSON 的任何内容吗

Question

我花了很多时间想不通。为什么为什么不解析。

func fetchUser(_ uid: String) {
    FIRDatabase.database().reference().child("users").child("g373gSvDcFhXNAGh5V6vg7sU5C02").observe(.childAdded, with: {
        (snapshot) in
        //TODO...

        print(snapshot) //Snap (email) test1@gmail.com
        let user = snapshot.value as ? [String: Any]

        print(user) //nil

        if let _nameLabel = self.nameLabel,
            let name = user ? ["name"] as ? String {
                _nameLabel.text = "{-} \(name)"
            }

    }, withCancel: nil)

}

Answer 1

问题:

您使用事件类型 .childAdded 进行观察

case childAdded is fired when a new child node is added to a location

解决方案:

您应该将事件类型从 .childAdded 更改为 .value，如下所示:

FIRDatabase.database().reference().child("users").child("g373gSvDcFhXNAGh5V6vg7sU5C02").observe(.value, with: { (snapshot) in

  // other code

})