segmentChanged category does not work for StoreSearch

 @IBOutlet weak var segmentedControl: UISegmentedControl!    
@IBAction func segmentChanged(_ sender: UISegmentedControl) {

func iTunesURL(searchText: String, category: Int) -> URL {
    let entityName: String
    switch category {
    case 1: entityName = "musicTrack"
    case 2: entityName = "software"
    case 3: entityName = "ebook"
    default: entityName = ""
    let escapedSearchText = searchText.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)!
    let urlString = String(format:"", escapedSearchText, entityName)
    let url = URL(string: urlString)

inside extention

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {

func performSearch() {
    if !searchBar.text!.isEmpty {
        isLoading = true
        hasSearched = true
        searchResults = []
        let url = self.iTunesURL(searchText: searchBar.text!,
                                 category: segmentedControl.selectedSegmentIndex)
        let session = URLSession.shared
        dataTask = session.dataTask(with: url, completionHandler: { data, response, error in
            if let error = error as NSError?, error.code == -999 {
            } else if let httpResponse = response as? HTTPURLResponse,
                httpResponse.statusCode == 200 {
                if let data =  data, let jsonDictonary = self.parse(json: data) {
                    self.searchResults = self.parse(dictionary: jsonDictonary)
                    self.searchResults.sort(by: <)
                    DispatchQueue.main.async {
                        self.isLoading = false
            } else {
                print("Failure! \(response!)")
            DispatchQueue.main.async {
                self.hasSearched = false
                self.isLoading = false

my click my sigment control but its not work :frowning: here is photo

i find what was problem i was missing …
this was wrong = let urlString = String(format:“
after i correct = let urlString = String(format:“
but after my app is working i search love and got result then i click software from navigationBar and my app was crash**( fatal error: unexpectedly found nil while unwrapping an Optional value)** i also find what is reason because there is no software with love name so it crash so my ques is what is best way handle this

i can do this way
if let price = dictionary[“trackPrice”] as? Double {
searchResult.price = price
but is it good i do for all like this ??

here is screen short

but it should be said not found yes ?

thanks i fixed and find where i done wrong thanks and sorry for post