我有一个很简单的问题。我想在集合视图中显示用户的好友请求列表。我已经实现了该功能，可以帮助我发送好友请求，该请求在Firebase数据库中效果很好，我所需要的只是正确显示列表。这是我用来执行该操作的代码段。
@objc func FriendUnFriendSelf(){
guard let currentLoggedInUser = Auth.auth().currentUser?.uid else {return}
guard let userId = user?.uid else {return}
if addOrSelfButton.titleLabel?.text == "Added"{
//unadd user
Database.database().reference().child("friendship").child(currentLoggedInUser).child(userId).removeValue (completionBlock: {(err, ref) in
if let err = err{
print("Failed to delete user request:", err)
return
}
print("Successfully delete user request:", self.user?.username ?? "")
self.addOrSelfButton.setTitle("Add", for: .normal)
self.addOrSelfButton.setTitleColor(UIColor.rgb(red: 32, green: 234, blue: 255), for: .normal)
})
}else{
let fromID = currentLoggedInUser
let toID = userId
// "0": wait for partner's acceptance
// "1": receive a new request, the user can choose to accept or reject
// "2": establish the friendship
let senderFriendRef = Database.database().reference().child("friendship").child(fromID)
senderFriendRef.updateChildValues([toID : 0])
let receiverFriendRef = Database.database().reference().child("friendship").child(toID)
receiverFriendRef.updateChildValues([fromID: 1])
}
}
但是当我想显示朋友列表时，我得到的任何回报都没有，这是显示列表的代码。
func fetchRequest() {
if let myID = Auth.auth().currentUser?.uid{
let ref = Database.database().reference().child("friendship").child(myID)
ref.observe(.childAdded, with: { (snapshot) in
if (snapshot.value as! Int == 1) {
let requestID = snapshot.key
let userRef = Database.database().reference().child("users").child(requestID)
userRef.observeSingleEvent(of: .value, with: { (snapshot) in
guard let dictionaries = snapshot.value as? [String: Any] else {return}
dictionaries.forEach({ (key, value) in
guard let userDictionary = value as? [String: Any] else {return}
var user = User(uid: key, dictionary: userDictionary)
user.id = requestID
self.friendRequest.append(user)
self.collectionView?.reloadData()
})
},withCancel: nil)}
}, withCancel: nil)
}
}
有关如何执行此操作的任何建议？非常感谢。