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@dmytro-anokhin
Created September 24, 2021 18:52
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@MainActor
final class AutocompleteObject: ObservableObject {
let delay: TimeInterval = 0.3
@Published var suggestions: [String] = []
init() {
}
private let citiesCache = CitiesCache(source: CitiesFile()!)
private var task: Task<Void, Never>?
func autocomplete(_ text: String) {
guard !text.isEmpty else {
suggestions = []
task?.cancel()
return
}
task?.cancel()
task = Task {
await Task.sleep(UInt64(delay * 1_000_000_000.0))
guard !Task.isCancelled else {
return
}
let newSuggestions = await citiesCache.lookup(prefix: text)
if isSuggestion(in: suggestions, equalTo: text) {
// Do not offer only one suggestion same as the input
suggestions = []
} else {
suggestions = newSuggestions
}
}
}
private func isSuggestion(in suggestions: [String], equalTo text: String) -> Bool {
guard let suggestion = suggestions.first, suggestions.count == 1 else {
return false
}
return suggestion.lowercased() == text.lowercased()
}
}
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