# New Features in iOS (Swift) SDK


This section highlights the new and improved features in the iOS (Swift) SDK compared to the iOS (Obj-C) SDK.

## New features

The iOS (Swift) SDK introduces several features not available in the iOS (Obj-C) SDK.

### Modern Swift concurrency

The iOS (Swift) SDK is built with `async-await` and structured concurrency. It uses reactive state management for better performance and reliability, and non-blocking operations for improved app responsiveness.

### Enhanced platform support

The SDK adds native support for macOS 12.0+ and provides a unified API across all Apple platforms. It leverages the latest iOS 15.0+, macOS 12.0+, tvOS 15.0+, and watchOS 8.0+ features.

### Custom plugins

Custom plugins let you intercept and transform events at any point in the analytics pipeline. With this feature, you can:

- Enrich events with device context
- Filter out sensitive data or drop specific information (for example, `Application Opened` and `Application Backgrounded` events) before it leaves the device.

The new plugin system lets you add, remove, or modify custom plugins at runtime.

```swift
// Create custom plugins
import RudderStackAnalytics

final class CustomEventFilter: Plugin {
    var pluginType: PluginType = .onProcess
    var analytics: Analytics?
    
    func setup(analytics: Analytics) {
        self.analytics = analytics
    }
    
    func intercept(event: any Event) -> (any Event)? {
        // Custom filtering logic
        return event
    }
}

analytics.add(plugin: CustomEventFilter())
```

See the [Custom plugins]({{< ref "sources/event-streams/sdks/client-side-features/plugin-architecture/_index.md#custom-plugins" >}}) guide for more information.

### Multiple analytics instances

You can create and manage multiple analytics instances with different configurations. 

Each instance maintains its own independent state, storage, and configuration — this is particularly useful for multi-tenant applications or tracking different data streams.

See the [Multiple Instance Support]({{< ref "sources/event-streams/sdks/client-side-features/multiple-instance-support.md" >}}) guide for more information.

### Custom logger

Use a centralized custom logger abstraction with pluggable implementations and global log-level configuration.

See the [Logging APIs in Mobile SDKs]({{< ref "sources/event-streams/sdks/mobile-sdk-apis/logging-apis.md" >}}) guide for more information.

### Custom plugins in integrations

You can add custom plugins to any [supported integration]({{< ref "sources/event-streams/sdks/swift-sdk/device-mode-integrations.md" >}}) to enhance event handling and processing.

See [Add custom plugins to integrations]({{< ref "sources/event-streams/sdks/device-mode-integrations/usage.md#add-custom-plugins-to-integrations" >}}) for more information.

### Shutdown API

You can explicitly shut down the `analytics` instance to terminate all ongoing operations. The SDK automatically removes all registered plugins and releases allocated resources. All events recorded before shutdown are persisted and processed on the next startup.

```swift
analytics.shutdown()
```

See the [Shutdown API]({{< ref "sources/event-streams/sdks/mobile-sdk-apis/shutdown.md" >}}) guide for more information.

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