swift - 如何在一个 UICollectionViewController 中查看我的所有聊天室？

Question

因此，我尝试将所有聊天室放入一个 CollectionViewController 中，但我只能看到一个，并且在该聊天室中我看不到图像和我命名为聊天室的标签。我所看到的只是一张白色图片和原始标签。我的代码:

func CreateNewRoom(user: User, caption: String, data: NSData) {
    let filePath = "\(user.uid)/\(Int(NSDate.timeIntervalSinceReferenceDate))"
    let metaData = StorageMetadata()
    metaData.contentType = "image/jpg"
    storageRef.child(filePath).putData(data as Data, metadata: metaData) { (metadata, error) in
        if let error = error {
            print("Error uploading: \(error as NSError)")
            return
        }
        let chatRef = self.storageRef.child("images/chat.jpg")

        chatRef.downloadURL { url, error in
            if error != nil {

            } else {

            }
        }
        if Auth.auth().currentUser != nil {
            let idRoom = self.BASE_REF.child("rooms").childByAutoId()
            idRoom.setValue(["caption": caption, "thumbnailUrlFromStorage": self.storageRef.child(metadata!.path!).description, "fileUrl": self.fileUrl])
        }
    }
}
func fetchDataFromServer(callback: @escaping (Room) -> ()) {
    DataService.dataService.ROOM_REF.observeSingleEvent(of: .childAdded) { (snapshot) in

        print("FOUND ROOM "+snapshot.key)

        let room = Room(key: snapshot.key, snapshot: snapshot.value as! Dictionary<String, AnyObject>)
        callback(room)
    }
}

Answer 1

您只能看到一个聊天室的原因是您正在调用 observeSingleEventv，它会在第一个子节点之后停止监听。要从 ROOM_REF 获取所有子节点，请使用 observe。

所以:

func fetchDataFromServer(callback: @escaping (Room) -> ()) {
    DataService.dataService.ROOM_REF.observe(.childAdded) { (snapshot) in

        print("FOUND ROOM "+snapshot.key)

        let room = Room(key: snapshot.key, snapshot: snapshot.value as! Dictionary<String, AnyObject>)
        callback(room)
    }
}