search function in textfield using mvvm method in the swift3 - ios

Question

how to do search function in textfield using mvvm method in the swift3.
i have listed the data in the tableview from the api.But i need to implement searching the tableview on textfield action .so how to do viewmodel and viewcontroller.
my viewmodel:-
class ViewModel: NSObject {
var datasourceModel:DataSourceModel
init(withdatasource newDatasourceModel: DataSourceModel) {
datasourceModel = newDatasourceModel
}
func datafordisplay(atindex indexPath: IndexPath) -> Model{
return datasourceModel.dataListArray![indexPath.row]
}
func numberOfRowsInSection(section:Int) -> Int {
return (datasourceModel.dataListArray?.count)!
}
func search(completion :#escaping (_ isSearching:Bool) -> ()) {
loadFromWebserviceData { (newDataSourceModel) in
if(newDataSourceModel != nil)
{
self.datasourceModel = newDataSourceModel!
completion(true)
}
else{
completion(false)
}
}
}
func loadData(completion :#escaping (_ isSucess:Bool) -> ()){
loadFromWebserviceData { (newDataSourceModel) in
if(newDataSourceModel != nil)
{
self.datasourceModel = newDataSourceModel!
completion(true)
}
else{
completion(false)
}
}
}
//}
func loadFromWebserviceData(completion :#escaping (DataSourceModel?) -> ()){
//with using Alamofire ..............
Alamofire.request("http://www.example").validate(statusCode: 200..<300).validate(contentType: ["application/json"]).responseJSON{ response in
switch response.result{
case .success(let data):
print("success",data)
let result = response.result
if let wholedata = result.value as? [String:Any]{
if let data = wholedata["data"] as? Array<[String:Any]>{
// print(data["name"] as! String)
print(data)
print(response)
let newDataSource:DataSourceModel = DataSourceModel(array: data)
completion(newDataSource)
// }
}
}
// case .failure(let data):
// print("fail",data)
case .failure(let encodingError ):
print(encodingError)
// if response.response?.statusCode == 404{
print(encodingError.localizedDescription)
completion(nil)
// }
}
}}
}
my viewcontroller:-
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource, UISearchBarDelegate,UITextFieldDelegate {
#IBOutlet private weak var tableView: UITableView!
#IBOutlet weak var txt: UITextField!
private var searchViewModel :ViewModel!
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?, withViewModel viewModel:ViewModel) {
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.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControlEvents.editingChanged)
searchViewModel.loadData { (isSuccess) in
if(isSuccess == true)
{
self.tableView.reloadData()
}
else{
}
}
}
#objc private func textFieldDidChange(textField: UITextField) {
if textField.text == "" {
self .viewDidLoad()
}
else{
filterContentForSearchText(searchText: textField.text!)
}
}
func filterContentForSearchText(searchText: String) {
tableView.reloadData()
}
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: SearchCell! = tableView.dequeueReusableCell(withIdentifier: identifier) as? QM_SearchCell
if cell == nil {
tableView.register(UINib(nibName: "SearchCell", bundle: nil), forCellReuseIdentifier: identifier)
cell = tableView.dequeueReusableCell(withIdentifier: identifier) as? SearchCell
}
cell.setsearchData(search: searchViewModel.datafordisplay(atindex: indexPath))
return cell
}
and my datasource:-
var dataListArray:Array<Model>? = []
init(array :Array<[String:Any]>?) {
super.init()
var newArray:Array<[String:Any]> = []
if array == nil{
// newArray = self.getJsonDataStored44()
}
else{
newArray = array!
}
var datalist:Array<Model> = []
for dict in newArray{
let model = Model(dictionary: dict)
datalist.append(model)
}
self.dataListArray = datalist
}
}
this is my code ..so what is the changes needed in the viewmodel ,no of section in tableview,cell for row at tableview and the function while clicking the textfeild.