> For the complete documentation index, see [llms.txt](https://docs.luciq.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.luciq.ai/references/sdk-event-handlers/set-pre-invocation-handler.md).

# Set Pre-Invocation Handler

API reference for Luciq's pre-invocation handler. Register a callback that fires before the Luciq UI is shown, allowing you to set additional context.

Use this handler to run any code prior to Luciq being invoked.

This block is executed on the UI thread and could be used for performing any UI changes before the SDK's UI is shown.

{% tabs fullWidth="true" %}
{% tab title="iOS - Swift" %}

```swift
BugReporting.willInvokeHandler = {
    someObject.setSomeState()
}
```

{% endtab %}

{% tab title="iOS - ObjC" %}

```objectivec
LCQBugReporting.willInvokeHandler = ^{
    [someObject setSomeState];
};
```

{% endtab %}

{% tab title="And - Java" %}

```java
BugReporting.setOnInvokeCallback(new OnInvokeCallback() {
            @Override
            public void onInvoke() {
               //do something
            }
});
```

{% endtab %}

{% tab title="And - Kotlin" %}

```kotlin
BugReporting.setOnInvokeCallback {
                     //do something
        }
```

{% endtab %}

{% tab title="RN" %}

```javascript
BugReporting.onInvokeHandler(function () {
    // Perform any UI changes before the SDK's UI is shown.
});
```

{% endtab %}

{% tab title="Flutter" %}

```dart
BugReporting.setOnInvokeCallback(Function function);
```

{% endtab %}
{% endtabs %}


---

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