swift - 从子 Collection View 中检索所有值

Question

我正在尝试将一个子项的所有值检索到 CollectionView 中

我不断收到此错误

无法在此行中转换类型“__NSDictionaryM”的值

let follower = snapshotValue!["Followers"] as! String

这是我的代码

followRef.child("users").child((FIRAuth.auth()?.currentUser?.displayName)!).observe(FIRDataEventType.value, with: {
            snapshot in
            let snapshotValue = snapshot.value as? Dictionary<String,AnyObject>
            let follower = snapshotValue!["Followers"] as! String
            self.postsFollow.insert(postFollowStruct(follower: follower) , at: 0)
            self.followersView.reloadData()
            })

Answer 1

据我了解，您的 snapshot.value 中有许多 json 对象？然后你想将它们每个都转换为一个对象并将它们放入一个数组中？

if let dict = snapshot.value as? [String: AnyObject]{
                    let followers = dict
                    for follower in followers {
                        if let restDict = follower.value as? [String:AnyObject] {
                            let followerObj = Follower()
                            followerObj.setValuesForKeys(restDict)
                            //add to array
                        }
                    }
                }