没有从firebase接收数据？

Question

我正在尝试从Firebase加载数据，我过去使用过以下代码但是我添加了一个额外的子代，因此以下代码现在不起作用。我迷路了。任何帮助将不胜感激。

图像是UIImageView

let databaseRef = Database.database().reference()

        databaseRef.queryOrderedByKey().observe(.childAdded, with: {
            snapshot in

            let content2 = (snapshot.value as? NSDictionary)?["imageWebsite"] as? String ?? ""
            let content3 = (snapshot.value as? NSDictionary)?["infoWebsite"] as? String ?? ""

            self.imgURL = content2
            self.infoURL = content3

        })


        print(imgURL)
        image.setImageFromURl(stringImageUrl: imgURL)

Answer 1

通过在数据库查询中放置setImageFromURL func，它会在完成查询之前执行代码，确保加载objects。

let databaseRef = Database.database().reference()

        databaseRef.queryOrderedByKey().observe(.childAdded, with: {
            snapshot in

            let content2 = (snapshot.value as? NSDictionary)?["imageWebsite4"] as? String ?? ""
            let content3 = (snapshot.value as? NSDictionary)?["infoWebsite4"] as? String ?? ""

            self.imgURL = content2
            self.infoURL = content3
            print(content2)

            print(self.imgURL)
            self.image.setImageFromURl(stringImageUrl: self.imgURL)


        })