Search Function: added comments

Location Tutorial/LocationSearch.swift

@@ -11,6 +11,7 @@ import MapKit
 
 class LocationService: NSObject, ObservableObject {
     
+    // Differnt search states
     enum LocationStatus: Equatable {
         case idle
         case noResults
@@ -19,6 +20,9 @@ class LocationService: NSObject, ObservableObject {
         case result
     }
     
+    // queryFragment used in view gets updated every time the user types something
+    // default status is idle
+    // searchResults contains all the results from the queries
     @Published var queryFragment: String = ""
     @Published private(set) var status: LocationStatus = .idle
     @Published private(set) var searchResults: [MKLocalSearchCompletion] = []
@@ -26,15 +30,21 @@ class LocationService: NSObject, ObservableObject {
     private var queryCancellable: AnyCancellable?
     private let searchCompleter: MKLocalSearchCompleter!
     
+    // initiate the search completer, set the delegate on self
     init(searchCompleter: MKLocalSearchCompleter = MKLocalSearchCompleter()) {
         self.searchCompleter = searchCompleter
         super.init()
         self.searchCompleter.delegate = self
         
+        // receive a stream from the queryFragment in the view
+        // debounce (wait) for 250miliseconds before pushing the event further
+        // sink returns the updated string after waiting the specified amount of time
         queryCancellable = $queryFragment
             .receive(on: DispatchQueue.main)
             .debounce(for: .milliseconds(250), scheduler: RunLoop.main, options: nil)
             .sink(receiveValue: { fragment in
+                
+                // if fragment isn't empty then set the queryFrament to the current updated string
                 self.status = .isSearching
                 if !fragment.isEmpty {
                     self.searchCompleter.queryFragment = fragment
@@ -46,8 +56,12 @@ class LocationService: NSObject, ObservableObject {
     }
 }
 
+// every time the queryFragment gets updated these functions get called
 extension LocationService: MKLocalSearchCompleterDelegate {
     func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
+        // query the current input, filter out the results that have subtitles
+        // results with no subtitles are usually countries and cities
+        // remove filter if you want to get points of interest as well
         self.searchResults = completer.results.filter({ $0.subtitle == "" })
         self.status = completer.results.isEmpty ? .noResults : .result
     }

Location Tutorial/MapSerachView.swift

@@ -23,6 +23,10 @@ struct ContentView: View {
                 Section(header: Text("Search")) {
                     ZStack(alignment: .trailing) {
                         TextField("Search", text: $locationService.queryFragment)
+                        
+                        // while user is typing input it sends the current query to the location service
+                        // which in turns sets its status to searching; when searching status is set on
+                        // searching then a clock symbol will be shown beside the search box
                         if locationService.status == .isSearching {
                             Image(systemName: "clock")
                             .foregroundColor(Color.gray)
@@ -39,7 +43,8 @@ struct ContentView: View {
                                 default: return AnyView(EmptyView())
                                 }
                         }.foregroundColor(Color.gray)
-                                                    
+                                       
+                        // display the results as a list
                         ForEach(locationService.searchResults, id: \.self) {
                             completionResult in Text(completionResult.title)
                         }