# Opt-out

When Opt-out is enabled, the SDK stops sending all events.

## Configure at Initialization

{% tabs %}
{% tab title="Swift" %}

```swift
let config = HackleConfigBuilder()
    .optOutTracking(true)
    .build()

Hackle.initialize(sdkKey: YOUR_APP_SDK_KEY, config: config) {
    // SDK ready to use.
}
```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
HackleConfigBuilder *builder = [[HackleConfigBuilder alloc] init];
[builder optOutTracking:YES];
HackleConfig *config = [builder build];

[Hackle initializeWithSdkKey:@"YOUR_APP_SDK_KEY" config:config completion:^{
    // SDK ready to use.
}];
```

{% endtab %}
{% endtabs %}

## Runtime Opt-out Control

{% tabs %}
{% tab title="Swift" %}

```swift
hackleApp.setOptOutTracking(optOut: true)   // activate
hackleApp.setOptOutTracking(optOut: false)  // deactivate
let isOptOut = hackleApp.isOptOutTracking   // query (property, not method)
```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
[hackleApp setOptOutTrackingWithOptOut:YES];
[hackleApp setOptOutTrackingWithOptOut:NO];
BOOL isOptOut = hackleApp.isOptOutTracking;
```

{% endtab %}
{% endtabs %}

## Persistence Management

{% hint style="warning" %}
The Opt-out state changed at runtime is reset to the value configured in the initialization Config on app restart.

To persist the state across app restarts, you must implement your own save and restore logic.
{% endhint %}

{% tabs %}
{% tab title="Swift" %}

```swift
func saveOptOutState(_ optOut: Bool) {
    UserDefaults.standard.set(optOut, forKey: "hackle_opt_out")
    hackleApp.setOptOutTracking(optOut: optOut)
}

func getOptOutConfig() -> HackleConfig {
    let optOut = UserDefaults.standard.bool(forKey: "hackle_opt_out")
    return HackleConfigBuilder()
        .optOutTracking(optOut)
        .build()
}
```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
- (void)saveOptOutState:(BOOL)optOut {
    [[NSUserDefaults standardUserDefaults] setBool:optOut forKey:@"hackle_opt_out"];
    [hackleApp setOptOutTrackingWithOptOut:optOut];
}

- (HackleConfig *)getOptOutConfig {
    BOOL optOut = [[NSUserDefaults standardUserDefaults] boolForKey:@"hackle_opt_out"];
    HackleConfigBuilder *builder = [[HackleConfigBuilder alloc] init];
    [builder optOutTracking:optOut];
    return [builder build];
}
```

{% endtab %}
{% endtabs %}


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