Search JSON data in tableView swift4 - ios

Question

I am trying to show jsondata in to the tableView and search country from the searchBar but getting error in to the textDidChange function.
I want the user to enter three words into the searchBar then tableView will open and search data.
struct country : Decodable {
let name : String
let capital : String
let region : String
}
class ViewController: UIViewController,UISearchBarDelegate {
var isSearch : Bool = false
var countries = [country]()
var arrFilter:[String] = []
#IBOutlet weak var tableview: UITableView!
#IBOutlet weak var searchbar: UISearchBar!
override func viewDidLoad() {
super.viewDidLoad()
tableview.dataSource = self
tableview.delegate = self
searchbar.delegate = self
let jsonurl = "https://restcountries.eu/rest/v2/all"
let url = URL(string: jsonurl)
URLSession.shared.dataTask(with: url!) { (data, response, error) in
do{
self.countries = try JSONDecoder().decode([country].self, from: data!)
}
catch{
print("Error")
}
DispatchQueue.main.async {
self.tableview.reloadData()
}
}.resume()
}
shows error into this part.
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
if searchText.characters.count == 0 {
isSearch = false;
self.tableview.reloadData()
} else {
arrFilter = countries.filter({ (text) -> Bool in
let tmp: NSString = text
let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
return range.location != NSNotFound
})
if(arrFilter.count == 0){
isSearch = false;
} else {
isSearch = true;
}
self.tableview.reloadData()
}
}
}
my table view part
extension ViewController : UITableViewDelegate, UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if(isSearch){
return arrFilter.count
}
else{
return countries.coun
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableview.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
if(isSearch){
cell.textLabel?.text = arrFilter[indexPath.row]
}else{
cell.textLabel?.text = countries[indexPath.row].name.capitalized
}
return cell
}
}

Answer 1

First of all do not use NSString in Swift and the Foundation rangeOfString API, use native String and native range(of.
Second of all never check for an empty string and for an empty array with .count == 0. There is isEmpty.
Third of all please name structs and classes with a starting capital letter. struct Country ....
The error occurs because you are filtering Country instances and actually you are looking for its name or its region.
This is a pure Swift version of your code
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
if searchText.isEmpty {
isSearch = false
} else {
arrFilter = countries.filter( $0.name.range(of: searchText, options: .caseInsensitive) != nil }
isSearch = !arrFilter.isEmpty
}
self.tableview.reloadData()
}
If you want to filter for name and region write
arrFilter = countries.filter( $0.name.range(of: searchText, options: .caseInsensitive) != nil
|| $0.region.range(of: searchText, options: .caseInsensitive) != nil }
With this syntax declare arrFilter
var arrFilter = [Country]()
and in cellForRow write
let dataArray = isSearch ? arrFilter : countries
cell.textLabel?.text = dataArray[indexPath.row].name.capitalized

Answer 2

You are getting country object of your array as a string so such an error occured..
Please do as below
var arrFilter:[country] = [country]()
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableview.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
if(isSearch){
cell.textLabel?.text = arrFilter[indexPath.row].name.capitalized
}else{
cell.textLabel?.text = countries[indexPath.row].name.capitalized
}
return cell
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if searchText.characters.count == 0 {
isSearch = false;
self.tableview.reloadData()
} else {
arrFilter = countries.filter({ (country) -> Bool in
let tmp: NSString = NSString.init(string: country.name)
let range = tmp.range(of: searchText, options: NSString.CompareOptions.caseInsensitive)
return range.location != NSNotFound
})
if(arrFilter.count == 0){
isSearch = false;
} else {
isSearch = true;
}
self.tableview.reloadData()
}
}

Answer 3

First you can not assign a value type [Country] to [String].For example when assign a arrFilter at that time country.filter always return country type value not a string type.
use below code to helping you,
var countries = [country]()
var arrFilter:[country] = [country]()
inside the viewdidLoad
override func viewDidLoad() {
self.countries.append(country(name: "India", capital: "New Delhi", region: "Asia"))
self.countries.append(country(name: "Indonesia", capital: "Jakarta", region: "region"))
self.countries.append(country(name: "Australia", capital: "Canberra", region: "Austrialia"))
// Do any additional setup after loading the view.
}
And
self.arrFilter = self.countries.filter({ (country) -> Bool in
let temp : NSString = country.name as NSString //or you can use country.capital or country.region
let range = temp.range(of: "ind", options: .caseInsensitive)
print(range.location)
print(range.length)
print(temp)
return range.location != NSNotFound
})
Thanks