Question

好的，我希望这是有道理的：

所以我想要做的就是将用户名过滤到我从firebase获得的collectionView中。我完成了所有设置，它获取用户名并在单击搜索栏时将其显示在集合视图中。当我开始在搜索栏上输入时，它会过滤用户名但不在UI上。

原因是，因为点击过滤用户名时显示的搜索栏和collectionViews 位于不同的类中。

还不知道我想说什么？这就是我的意思：

click here for the searchBar & CollectionViewController together picture

click here to for the searchBar & collection View

UserSearchController及相关代码：

var users = [User]()
func fetchUsers() {
    let ref = FIRDatabase.database().reference().child("users")
    ref.observe(.value, with: { (snapshot) in
        guard let dictionaries = snapshot.value as? [String: Any] else { return }

        //For each iterates through every object in the dictioary
        dictionaries.forEach({ (key, value) in

            guard let userDictionary = value as? [String: Any] else { return}
            let user = User(uid: key, dictionary: userDictionary)
            self.users.append(user)
            print(user.uid, user.username)
        })
        self.collectionView?.reloadData()

    }) { (error) in
        print("failed to fetch users:", error)
    }
}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

    self.users = self.users.filter { (user) -> Bool in
        print(",here:",user)
        return user.username.contains(searchText)
    }
    self.collectionView?.reloadData()
}

UserSearchCV及相关代码：

var users = [User]()
func fetchUsers() {

    let ref = FIRDatabase.database().reference().child("users")
    ref.observe(.value, with: { (snapshot) in
        guard let dictionaries = snapshot.value as? [String: Any] else { return }

        //For each iterates through every object in the dictioary
        dictionaries.forEach({ (key, value) in

            guard let userDictionary = value as? [String: Any] else { return}
            let user = User(uid: key, dictionary: userDictionary)
            self.users.append(user)
            print(user.uid, user.username)
        })
        self.collectionView?.reloadData()

    }) { (error) in
        print("failed to fetch users:", error)
    }
}


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

//let numberOfUsers = UserSearchController.searchBar(users.count) did you mean to use a value of this type instead?
    return users.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! UserSearchCVCell
    //        let filteredUsers = UserSearchController.searchBar(users.count)
    //        cell.user = filteredUsers[indexPath.item]
    cell.user = users[indexPath.item]
    return cell
}

已经注释掉的代码会很好但是它不会让我编译错误＆＃39;实例成员＆＃39; searchBar不能用于类型＆＃39; UserSearchController＆＃39 ;。

var users =用户示例数据：

struct User {
let uid: String
let username: String
let profileImageUrl: String
let videos: String
init(uid: String, dictionary: [String: Any]) {
    self.uid = uid
    self.username = dictionary["username"] as? String ?? ""
    self.profileImageUrl = dictionary["profileImageUrl"] as? String ?? ""
    self.videos = dictionary["Videos"] as? String ?? ""
}

}

如果您对解决问题有任何疑问，请与我们联系。谢谢！

Answer 1

与OP讨论后，我们找到了解决方案

请遵循这些

首先按如下方式更新您的searchBar方法

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { 


self.users = self.users.filter { (user) -> Bool in 
print(",here:",user) 
delegate?.passFilterArray(self.users) 
return user.username.contains(searchText) 

} 
searchUsersCV.isHidden = true 
searchUsersCV.updateUsersView(self.users) 

self.collectionView?.reloadData() 
}

然后在UserSearchCV中添加此

func updateUsersView(_ users: [User]) { 

self.users = users 
print(self.users) 
self.collectionView.reloadData() 
}

searchBar无法过滤swift 3

1 个答案: