快速访问嵌套的Firebase数据 [英] accessing nested firebase data in swift

问题描述

我正在使用数据结构，并且正在遍历几个节点，这是我得到的json数据.

I am working wth a data structure, and I am looping through a couple nodes and here is the json data I get.

Snap (20171012) {
"-KwM45HyW4UduQgKTGn6" =     {
    ImageName = "Screen Shot 2017-10-13 at 11.24.51 AM.png";
    fileURL = "";
    thumbFileUrl = "";
    user = "User not defined";
};
"-KwM4limD2aRyHgeKE5P" =     {
    ImageName = "test.png";
    fileURL = "";
    thumbFileUrl = "";
    user = "User not defined";
};

}

之后，我可以使用data.key访问"snap"值以获取"20171012"

After this, I can access the "snap" value using my data.key to get the "20171012"

ref.child(myselected_spot!).observe(DataEventType.value, with: { (snapshot) in
        if snapshot.childrenCount > 0 {
            for mydata in snapshot.children.allObjects as! [DataSnapshot]
            {
                if mydata.key.characters.count == 8 {
                self.formattedDates.append(convertDate(stringDate: mydata.key))
                self.selected_dates.append(mydata.key)

如何获取"ImageName"的值

How would I get the value for "ImageName"

推荐答案

您的 mydata 是另一个 DataSnapshot ，因此您可以访问

Your mydata is another DataSnapshot, so you can access all methods and properties of that class. In this case you're looking for DataSnapshot.childSnapshotForPath::

ref.child(myselected_spot!).observe(DataEventType.value, with: { (snapshot) in        if snapshot.childrenCount > 0 {
    for mydata in snapshot.children.allObjects as! [DataSnapshot]
    {
        if mydata.key.characters.count == 8 {
        self.formattedDates.append(convertDate(stringDate: mydata.key))
        self.selected_dates.append(mydata.key)
        print(mydata.childSnapshot(forPath: "ImageName").value)

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