SwiftUI searchbar - ios

Question

I'm trying to build an App which can display different pdfs via sheet. So far so good, but I want the user to be able to filter the Button which triggers the sheet modifier via a searchbar. This is what doesn't work for me. I tried different solutions from web and Stack Overflow, but none of them worked for me. I think I have to filter the Text from the Buttons which trigger the Boolean for sheet. But how? With a List or a ForEach I can't Buttons with every time different var/Bool.
Below is my Searchbar class, with just a List and filtered it works.
class SearchBar: NSObject, ObservableObject {
let searchController: UISearchController = UISearchController(searchResultsController: nil)
#Binding var text: String
let hide : Bool
let placeholder : String
let cancelButton : Bool
let autocapitalization : UITextAutocapitalizationType
init(text: Binding<String>, hide: Bool, placeholder: String, cancelButton: Bool, autocapitalization: UITextAutocapitalizationType) {
self._text = text
self.hide = hide
self.placeholder = placeholder
self.cancelButton = cancelButton
self.autocapitalization = autocapitalization
super.init()
self.searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchResultsUpdater = self
self.searchController.hidesNavigationBarDuringPresentation = hide
self.searchController.automaticallyShowsCancelButton = cancelButton
self.searchController.searchBar.placeholder = placeholder
self.searchController.searchBar.autocapitalizationType = autocapitalization
}
}
extension SearchBar: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
// Publish search bar text changes.
if let searchBarText = searchController.searchBar.text {
self.text = searchBarText
}
}
}
struct SearchBarModifier: ViewModifier {
let searchBar: SearchBar
func body(content: Content) -> some View {
content
.overlay(
ViewControllerResolver { viewController in
viewController.navigationItem.searchController = self.searchBar.searchController
}
.frame(width: 0, height: 0)
)
}
}
extension View {
func add(_ searchBar: SearchBar) -> some View {
return self.modifier(SearchBarModifier(searchBar: searchBar))
}
}

Answer 1

My suggestion is to replace the Binding with an action which calls a closure and passes the entered text.
Replace the line #Binding var text: String with
var action : ((String) -> Void)?
Replace updateSearchResults with
func updateSearchResults(for searchController: UISearchController) {
if let searchBarText = searchController.searchBar.text {
DispatchQueue.main.async { self.action?(searchBarText) }
}
}
and the ViewModifier and the view extension with
struct SearchBarModifier: ViewModifier {
let searchBar: SearchBar
let action : ((String) -> Void)?
func body(content: Content) -> some View {
content
.overlay(
ViewControllerResolver { viewController in
searchBar.action = action
viewController.navigationItem.searchController = self.searchBar.searchController
}
.frame(width: 0, height: 0)
)
}
}
extension View {
func add(_ searchBar: SearchBar, action : ((String) -> Void)?) -> some View {
return self.modifier(SearchBarModifier(searchBar: searchBar, action: action))
}
}
In the view you can add the search bar with
.add(self.searchBar, action: { query in
// do something with query
})
Any time the user presses a key the closure is being called.
If you want to call the closure once when the user presses the Search/Go key you have to implement searchBarSearchButtonClicked and add another action.