如何检索Firebase中的子快照?
问题描述:
我试着使用for child in snapShot.children
我知道当时我曾经是能够使它发挥作用创造一个火力点childSnapshot
,林不知道这是否是在新的更新如何检索Firebase中的子快照?
是用来工作
-old方式的变革for child in snapshot.children {
let firUserId = child.childSnapshot(forPath: "userId").value! as! String
let receivePostSnapshot = child.childSnapshot(forPath: "receivePost")
}
我当前的代码不工作
func displayAvailaibleHelprOnMap(){
let refUrl = "frontEnd/users"
let childRef = Ref.childRef(refUrl: refUrl)//.child("users")
childRef.observe(.value, with: {snapshot in
let dict = snapshot.value as? NSDictionary
for child in snapshot.children{
// I want to use child snapshot here
//let childDict = child.childSnapshot(forPath: "receivePost")
}
}
答
尝试:
var ref: FIRDatabaseReference!
ref = FIRDatabase.database().reference()
ref.child("users").observeSingleEvent(of: .value, with: { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot] {
for snap in snapshots
{
let firUserId = child.childSnapshot(forPath: "userId").value! as! String
let receivePostSnapshot = child.childSnapshot(forPath: "receivePost")
}
}
})
答
试试这个
let mRef = mRestCallObj.getReferenceFirebase()
mRef!.child("users").queryOrderedByChild("receivePost").observeEventType(.ChildAdded, withBlock: { snapshot in
let userName = snapshot.value!["receivePost"] as? String
}
答
尝试这个 -
let ref = FIRDatabase.database().reference().child("Users + infomation").child(userid).child("cats")`
ref.observeSingleEventOfType(.Value, withBlock : {(snapShot) in
if let val = snapShot.value as? Int {print(snapShot)}
如果*我当前的代码不工作*,到底是你的问题或错误? – Dravidian
@Dravidian它应该说不行 – pprevalon