Search through tableview data and handle row selection in Swift-CodePudding

I have an issue while searching data from tableview. I want to search the data from tableview but stuck up while searching. Below is my code what i have tried. I'm getting issue is cannot assign value of type '[Employee]' to type '[String]' Please help. TIA

var empList: [Employee]!
var searchedText = [String]()

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
        if searching {
            return searchedText.count
        } else {
            return empList?.count  ?? 0
        }
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CustomCell
        if searching {
            cell.lblTitle.text = searchedText[indexPath.row]
        }else {

            let resObjects = empList?[indexPath.row]

            cell.lblTitle.text = resObjects?.emp_name

        }
return cell
}


 func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        
        searchedText = empList.filter{$0.emp_name?.contains(searchText)}
        
// The above line gives me error as, cannot assign value of type '[Employee]' to type '[String]'
        
        searching = true
        tableView.reloadData()
    }
    
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searching = false
        searchBar.text = ""
        tableView.reloadData()
    }

CodePudding user response：

Replace this:

searchedText = empList.filter{$0.emp_name?.contains(searchText)}

with this:

searchedText = empList.filter{$0.emp_name?.contains(searchText)}.map(\.emp_name) ?? []

The solution is mapping the array of Employee to array of String where the value is the emp_name from Employee model.

P.S: I'm using keyPaths >>> map(.emp_name) because it is shorter.

CodePudding user response：

As already mentioned in the comments it's highly recommended that the data source and the filtered array are of the same type.

And declare both as non-optional empty arrays and give them more meaningful names

var employees = [Employee]()
var filteredEmployees = [Employee]()

Then the data source methods become quite simple

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return searching ? filteredEmployees.count : employees.count
}
    
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {           
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CustomCell
    let employee = searching : filteredEmployees[indexPath.row] : employees[indexPath.row]
    cell.lblTitle.text = employee.emp_name
    return cell
}

And in textDidChange you have to consider that the user can delete all characters

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText.isEmpty {
       searching = false
       filteredEmployees.removeAll()
    } else {
       searching = true
       filteredEmployees = employees.filter{$0.emp_name.range(of: searchText, options: .caseInsensitive) != nil}
    }
    tableView.reloadData()
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searchBar.text = ""
}