SwiftUI includes a SearchBar component starting from iOS 15. Start with this code to display a list of vehicles:
struct Vehicle: Identifiable {
var id = UUID()
var name: String
var image: String
}
struct ContentView: View {
var vehicles = [Vehicle(name: "car", image: "car"),
Vehicle(name: "bus", image: "bus"),
Vehicle(name: "tram", image: "tram"),
Vehicle(name: "bicycle", image: "bicycle")]
var body: some View {
ForEach(vehicles) { vehicle in
RowView(vehicle: vehicle)
}
}
}
struct RowView: View {
var vehicle: Vehicle
var body: some View {
HStack {
Image(systemName: vehicle.image)
.resizable()
.frame(width: 60, height: 60)
Text(vehicle.name)
}
}
}
To implement the search we have to do:
- Create a variable to store the search results. (1)
- Create a variable to hold the search text. (2)
- Add a NavigationStack to the view, as the SearchBar will be placed in the navigation bar. (3)
- Add the searchBar to the list (4)
//....
@State private var searchText = "" // 2
var body: some View {
NavigationStack { // 3
List {
ForEach(searchResults) { vehicle in
RowView(vehicle: vehicle)
}.onDelete { (indexSet) in
self.vehicles.remove(atOffsets: indexSet)
}
}.searchable(text: $searchText) // 4
}
}
var searchResults: [Vehicle] { // 1
if searchText.isEmpty {
return vehicles
} else {
return vehicles.filter {$0.name.lowercased().contains(searchText.lowercased())}
}
}
Note that the ForEach now iterates over the searchResult, which contains all the vehicles if the searchText is empty, or the search results based on the vehicle’s name otherwise.
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It is a very useful element!