Filter Toggle
FilterToggleConnector<Filter: FilterType>( filterState: FilterState, filter: Filter, isSelected: Bool, refinementOperator: RefinementOperator, groupName: String?, controller: FilterSwitchController<FilterType> )
About this widget
Filter Toggle is a filtering component that displays any kind of filter, and lets the user refine the search results by toggling it on or off.
Examples
Instantiate a FilterToggleConnector and launch an initial search on its Searcher.
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let searcher = HitsSearcher(appID: "YourApplicationID",
apiKey: "YourSearchOnlyAPIKey",
indexName: "YourIndexName")
let filterState: FilterState = .init()
let filterToggleSwitchController: FilterSwitchController<Filter.Tag> = .init(switch: UISwitch())
let filterToggleConnector = FilterToggleConnector(filterState: filterState,
filter: "on sale" as Filter.Tag,
controller: filterToggleSwitchController)
searcher.connectFilterState(filterState)
searcher.search()
Parameters
filterState
|
type: FilterState
Required
The |
filter
|
type: Filter
Required
The Filter to toggle. |
interactor
|
type: SelectableInteractor<Filter>
default: .init()
Required
The logic applied to Filter Toggle. |
isSelected
|
type: Bool
default: false
Required
Whether the filter is initially selected. |
refinementOperator
|
type: RefinementOperator
default: .and
Optional
Whether the filter is added to a conjuncitve( |
groupName
|
type: String
default: nil
Optional
Defines the group name in which filter will be placed in |
controller
|
type: CurrentFiltersController
default: nil
Optional
The Controller interfacing with a concrete toggle filter view. |
Low-level API
If you want to fully control the Filter Toggle components and connect them manually, use the following components:
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let searcher = HitsSearcher(appID: "YourApplicationID",
apiKey: "YourSearchOnlyAPIKey",
indexName: "YourIndexName")
let filterState: FilterState = .init()
let filter: Filter.Tag = "on sale"
let filterToggleSwitchController: FilterSwitchController<Filter.Tag> = .init(switch: UISwitch())
let onSaleFilterInteractor: SelectableInteractor<Filter.Tag> = .init(item: filter)
searcher.connectFilterState(filterState)
onSaleFilterInteractor.connectFilterState(filterState)
onSaleFilterInteractor.connectController(filterToggleSwitchController)
searcher.search()
Customizing your view
The default controllers, e.g., FilterSwitchController, work well when you want to use native UIKit with their default behavior.
If you want to use another component such as a UIButton, a third-party input view, or you want to introduce some custom behavior to the already provided UIKit component, you can create your own controller conforming to the SelectableController protocol.
Protocol
var onClick: ((Bool) -> Void)?:
Closure to call when a filter is toggled.
func setSelected(_ isSelected: Bool)
Function called when a selection state of filter is updated. This is the UI State of the toggle. Make sure to update your view here when you get the new selection state.
Example
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public class FilterSwitchController<F: FilterType>: SelectableController {
public typealias Item = F
public let `switch`: UISwitch
public var onClick: ((Bool) -> Void)?
public init(`switch`: UISwitch) {
self.switch = `switch`
`switch`.addTarget(self, action: #selector(didToggleSwitch), for: .valueChanged)
}
@objc func didToggleSwitch(_ switch: UISwitch) {
onClick?(`switch`.isOn)
}
public func setSelected(_ isSelected: Bool) {
self.switch.isOn = isSelected
}
public func setItem(_ item: F) {
}
}
SwiftUI
InstantSearch provides the FilterToggleObservableController data model, which is an implementation of the SelectableController protocol adapted for usage with SwiftUI.
FilterToggleObservableController must be connected to the FilterToggleConnector or SelectableInteractor<Filter> like any other SelectableController implementation.
The example of the toggle filter view using the Toggle component provided by SwiftUI.
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struct ContentView: View {
@ObservedObject var toggleController: FilterToggleObservableController<Filter.Tag>
var body: some View {
Toggle(toggleController.filter?.description ?? "No filter",
isOn: $toggleController.isSelected).padding()
}
}
If you prefer to create a custom filter toggle SwiftUI view, you can directly use the FilterToggleObservableController as a data model.
It provides filter and isSelected properties to streamline the design process of your custom SwiftUI view.
Check out the example to see this widget in action.
