Question

I am using a tableView to display data of users, I want to enable multiple user selection and for now it malfunctions in such that when I deselect a selected user, the user details still remains in the array which I am storing it inside. how can I fix this. below is my code currently

struct ChatUser {
   var id: String
var name: String
}

var selectedUser: [ChatUser] = []

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if self.selectedUser.contains(self.users[indexPath.row]) {
            let myIndex = self.selectedUser.index(of: self.users[indexPath.row])
            self.selectedUser.remove(at: myIndex!)
        } else {
            self.selectedUser.append(self.users[indexPath.row])
        }

        selectedUser.forEach { (user) in
            print("SELECTD \(user.id)")
        }
    }

Answer 1

One thing to ensure here is that the struct is equatable

extension ChatUser: Equatable {

    static func == (lhs: ChatUser, rhs: ChatUser) -> Bool {
        return lhs.id == rhs.id
    }
}

This is why your .contains and .indexOf are not working properly

Answer 2

For removing your selected data for multi selection you can use didDeselectRowAt method of tableview delegate.

 struct ChatUser {
       var id: String
    var name: String
    }

    var selectedUser: [ChatUser] = []

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

            self.selectedUser.append(self.users[indexPath.row])

            selectedUser.forEach { (user) in
                print("SELECTD \(user.id)")
            }
    }

    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {   
           if self.selectedUser.contains(self.users[indexPath.row]) {
                let myIndex = self.selectedUser.index(of: self.users[indexPath.row])
                self.selectedUser.remove(at: myIndex!)
            }
    }

Multiple selection of row swift

2 个答案: