Firebase为我提供了使用FIRDatabase和FIRDataSnapshot的未声明类型

Question

Firebase IO示例Zero to App为我提供了无法定义的错误

// Firebase services
var database: FIRDatabase!

并且

// Create a chat message from a FIRDataSnapshot
func chatMessageFromSnapshot(snapshot: FIRDataSnapshot) -> ChatMessage? {
    let data = snapshot.value as! Dictionary<String, String>
    guard let name = data["name"] as String! else { return nil }
    guard let message = data["message"] as String! else { return nil }
    let chatMessage = ChatMessage(name: name, message: message, image: nil)
    return chatMessage
}

我是Firebase的新手,想要学习,但每次尝试或文档中缺少某些内容时,这些示例都会给我错误...

FIRDatabase和FIRDataSnapshot给出错误:使用未声明类型'FIRDataSnapshot'和使用未声明类型'FIRDatabase'

Answer 1

尝试仅导入所需的框架,而不是通用的firebase.因此,如果您的导入如下所示:

import Firebase
import FirebaseStorage
import FirebaseAnalytics
import FirebaseDatabase

试试吧

import FirebaseStorage
import FirebaseAnalytics
import FirebaseDatabase