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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // | ||
| // CountryListViewModel.swift | ||
| // Columbus-iOS | ||
| // | ||
| // Created by Stefan Herold on 01.08.19. | ||
| // Copyright © 2019 CodingCobra. All rights reserved. | ||
| // | ||
|
|
||
| import SwiftUI | ||
| import Combine | ||
|
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| /// Advances in Networking 1: https://developer.apple.com/videos/play/wwdc2019/712/?time=705 | ||
| /// https://www.reddit.com/r/SwiftUI/comments/c5wi5w/throttledebounce_binding/ | ||
| /// https://github.com/Dimillian/MovieSwiftUI/blob/7ed177d18f83406c80ca7367a2e2fb3f73b9f156/MovieSwift/MovieSwift/binding/SearchTextBinding.swift | ||
| public final class CountryListViewModel: ObservableObject { | ||
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| private var store: CountryStore | ||
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| @Published var filteredCountries: [Country] = [] | ||
| @Published var selectedCountry: Country? = nil | ||
| var query: String = "" { | ||
| willSet { | ||
| DispatchQueue.main.async { | ||
| self.searchSubject.send(newValue) | ||
| } | ||
| } | ||
| didSet { | ||
| DispatchQueue.main.async { | ||
| self.onUpdateText(text: self.query) | ||
| } | ||
| } | ||
| } | ||
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| private let searchSubject = PassthroughSubject<String, Never>() | ||
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| private var searchCancellable: Cancellable? { | ||
| didSet { | ||
| oldValue?.cancel() | ||
| } | ||
| } | ||
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| deinit { | ||
| searchCancellable?.cancel() | ||
| } | ||
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| public init(store: CountryStore) { | ||
| self.store = store | ||
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| searchCancellable = searchSubject | ||
| .eraseToAnyPublisher().map { $0 } | ||
| .debounce(for: .milliseconds(300), scheduler: DispatchQueue.main) | ||
| // .throttle(for: 0.3, scheduler: RunLoop.main, latest: true) | ||
| .removeDuplicates() | ||
| // .filter { !$0.isEmpty } | ||
| .sink(receiveValue: { (searchText) in | ||
| self.filteredCountries = self.store.filtered(by: searchText) | ||
| self.onUpdateTextDebounced(text: searchText) | ||
| }) | ||
| } | ||
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| /// Overwrite by your subclass to get instant text update. | ||
| func onUpdateText(text: String) { | ||
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| } | ||
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| /// Overwrite by your subclass to get debounced text update. | ||
| func onUpdateTextDebounced(text: String) { | ||
| } | ||
| } |
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