# Initialization

To initialize the SDK, you need to add `SinchChatSDK.shared.initialize()` to the `application` function definition in the `AppDelegate` file. For example:


```swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

SinchChatSDK.shared.initialize()

return true

}
```

After initializing, you must [set the identity]((/docs/sinch-chat/getting-started/ios/set-identity/).