> ## Documentation Index
> Fetch the complete documentation index at: https://algolia.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Loading
> Shows a loading indicator during pending search requests.
```ts Signature theme={"system"}
LoadingConnector(
searcher: SingleIndexSearcher,
interactor: LoadingInteractor,
controller: LoadingController
)
```
Browse the Loading example code on GitHub.
## About this widget
Components that show a loading indicator during pending requests.
## Examples
Instantiate a `LoadingConnector`.
```swift Swift icon=code theme={"system"}
let searcher = HitsSearcher(appID: "YourApplicationID",
apiKey: "YourSearchOnlyAPIKey",
indexName: "YourIndexName")
let activityIndicatorController: ActivityIndicatorController = .init(activityIndicator: UIActivityIndicatorView())
let loadingConnector: LoadingConnector = .init(searcher: searcher,
controller: activityIndicatorController)
// Execute a search which will spin the loading indicator until the results arrive
searcher.search()
```
## Parameters
The [`Searcher`](/doc/api-reference/widgets/instantsearch/ios) that handles your searches.
The business logic that handles showing a loading indicator.
Controller that interfaces with a concrete loading view.
## Low-level API
If you want to fully control the loading indicator components and connect them manually, you can use these components.
The loading indicator consists of the following components:
* `Searcher`. The [`Searcher`](/doc/api-reference/widgets/instantsearch/ios) that handles your searches.
* `LoadingInteractor`. The logic that handles showing a loading indicator
* `LoadingController`. The controller that interfaces with a concrete loading indicator.
```swift Swift icon=code theme={"system"}
let searcher = HitsSearcher(appID: "YourApplicationID",
apiKey: "YourSearchOnlyAPIKey",
indexName: "YourIndexName")
let loadingInteractor: LoadingInteractor = .init()
let activityIndicatorController: ActivityIndicatorController = .init(activityIndicator: UIActivityIndicatorView())
loadingInteractor.connectSearcher(searcher)
loadingInteractor.connectController(activityIndicatorController)
// Execute a search which will spin the loading indicator until the results arrive
searcher.search()
```
## Customizing your view
The default controllers, such as `ActivityIndicatorController`,
work well when you want to use native UIKit with their default behavior like `UIActivityIndicatorView`.
If you want to use another component such as a third-party view,
or want to introduce some custom behavior to the already provided UIKit components,
you can create your own controller conforming to the `LoadingController` protocol.
### Protocol
```swift Swift icon=code theme={"system"}
func setItem(_ item: Bool)`
```
Function called when a new state of the loading indicator is set.
### Example
```swift Swift icon=code theme={"system"}
public class ActivityIndicatorController: LoadingController {
let activityIndicator: UIActivityIndicatorView
public init (activityIndicator: UIActivityIndicatorView) {
self.activityIndicator = activityIndicator
}
public func setItem(_ item: Bool) {
item ? activityIndicator.startAnimating() : activityIndicator.stopAnimating()
}
}
```
### SwiftUI
InstantSearch provides the `LoadingObservableController` data model,
which is an implementation of the `LoadingController` protocol adapted for usage with SwiftUI.
`LoadingObservableController` must be connected to the `LoadingConnector` or `LoadingConnector` like any other `LoadingController` implementation.
The example of the loading view using the `ProgressView` component provided by SwiftUI.
```swift Swift icon=code theme={"system"}
struct ContentView: View {
@ObservedObject var loadingController: LoadingObservableController
var body: some View {
VStack {
Text("Loading")
if loadingController.isLoading {
ProgressView()
}
}
}
}
```
If you prefer to create a custom SwiftUI view that presents the loading indicator,
you can directly use the `LoadingObservableController` as a data model.
It provides the `isLoading` property to streamline the design process of your custom SwiftUI view.