ios - Swift3 Firebase 检索数据

Question

我正在努力从 Firebase 获取一些数据。结构如下:

这是我检索数据的代码:

var followDatesDict = [String:String]()

databaseRef.child("FollowGroups").child(selectedFollowGroupId as String).observeSingleEvent(of: .value, with: { (snapshot) in
                if snapshot.hasChildren(){

                    let name = snapshot.childSnapshot(forPath: "followgroupTitle").value as! String
                    let sDate = snapshot.childSnapshot(forPath: "startDate").value as! String
                    let eDate = snapshot.childSnapshot(forPath: "endDate").value as! String

                    followDatesDict = snapshot.childSnapshot(forPath: "followDates")......



                }
            })

我可以很好地检索name、sDate 和eDate。但有谁知道我如何填写按日期排序的 followDatesDict ？正如您在 followDates 的结构中看到的，键是一个日期字符串和一个字符串值。

谢谢!

Answer 1

好的，我成功获取数据了。我还将它们添加到结构中。

let enumerator = snapshot.childSnapshot(forPath: "followDates").children
                    while let rest = enumerator.nextObject() as? FIRDataSnapshot {
                        let key_followDate = rest.key
                        let value_UserId = rest.value as! String

                        //add to dictionary
                        self.followDatesDict.insert(followgroupOverview(followDate:key_followDate, followUserId:value_UserId), at: 0)
                    }