从Firebase（iOS）读取数据

Question

I have a small dataset in Firebase database, but unfortunately, I can't get read value from list correctly. Here is the structure of the database.

I just need to get the value of day and reference it to var. Thanks in advance.

Answer 1

var collnum = "" 
ref = Database.database().reference() 
let collid = ref.child("collid").child("day") 


collid.observeSingleEvent(of : .value, with : {(Snapshot) in

        print(Snapshot)

        if let snapDate = Snapshot.value as? String{
                    collnum = snapDate
                   print(snapDate)
            }
    })

Answer 2

   let database = FIRDatabase.database().reference()
   database.child("collid").queryOrderedByKey().observe(.value, with: 
   { 
       if let value = snapshot.value as? [String: AnyObject] 
       {
          let ui = value["day"] as! String
          print(ui)
       }  
   }

You can do something like this to read the data. This will read the data from the database and put into an array, allowing you to read the data.