UITextfield delegate method in mvvm - ios

Question

I need to search the tableview in mvvm .
my viewmodel:-
function for search:-
func search(searchText :String?) {
filteredListArray = datasourceModel.dataListArray?.filter{($0.restaurantname?.range(of: searchText!, options: .caseInsensitive) != nil)}
}
And in the viewcontroller i just given the textfield delegate method.
my viewcontroller:-
class QM_SearchViewController: UIViewController,UITableViewDelegate,UITableViewDataSource, UISearchBarDelegate,UITextFieldDelegate {
#IBOutlet private weak var tableView: UITableView!
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var txt: UITextField!
var isSearching = false
var search:String=""
var filteredSearchArray = NSMutableArray()
private var searchViewModel :QM_SearchViewModel!
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?, withViewModel viewModel:QM_SearchViewModel) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
searchViewModel = viewModel
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "SEARCH"
txt.delegate = self
searchViewModel.loadData { (isSuccess) in
if(isSuccess == true)
{
self.tableView.reloadData()
}
else{
}
}
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
print("While entering the characters this method gets called")
return true;
}
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool { //delegate method
return false
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchViewModel.numberOfRowsInSection(section: section)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let identifier = "searchcell"
var cell: QM_SearchCell! = tableView.dequeueReusableCell(withIdentifier: identifier) as? QM_SearchCell
if cell == nil {
tableView.register(UINib(nibName: "QM_SearchCell", bundle: nil), forCellReuseIdentifier: identifier)
cell = tableView.dequeueReusableCell(withIdentifier: identifier) as? QM_SearchCell
}
cell.setsearchData(search: searchViewModel.datafordisplay(atindex: indexPath))
return cell
}
}
So in the textfield delegate HOW could i search.How could take the search function from viewmodel.How the searching tableview task take place

Answer 1

Just in side your shouldChangeCharactersIn you can call searchViewModel Search Method , if it not trigger update your dataSource Automatically , you will need to trigger your data source after call search Method
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let text = textField.text,
let textRange = Range(range, in: text) {
let updatedText = text.replacingCharacters(in: textRange,
with: string)
if updatedText.count > 2 {
let result = searchViewModel.search(searchText :updatedText)
// result Should update your data Source searchViewModel.numberOfRowsInSection , and reload tableView
}
}
return true;
}