# Generate the iOS SDK of an API in API Gateway
<a name="generate-ios-sdk-of-an-api"></a>

The following procedure shows how to generate the iOS SDK of an API in API Gateway.

**To generate the iOS SDK of an API in API Gateway**

1. Sign in to the API Gateway console at [https://console.aws.amazon.com/apigateway](https://console.aws.amazon.com/apigateway).

1. Choose a REST API.

1. Choose **Stages**. 

1. In the **Stages** pane, select the name of the stage.

1. Open the **Stage actions** menu, and then choose **Generate SDK**.

1. For **Platform**, choose the **iOS (Objective-C) or iOS (Swift)** platform and do the following: 

   1. Type a unique prefix in the **Prefix** box.

     The effect of prefix is as follows: if you assign, for example, **SIMPLE\$1CALC** as the prefix for the SDK of the [SimpleCalc](simple-calc-lambda-api.md) API with `input`, `output`, and `result` models, the generated SDK will contain the `SIMPLE_CALCSimpleCalcClient` class that encapsulates the API, including the method requests/responses. In addition, the generated SDK will contain the `SIMPLE_CALCinput`, `SIMPLE_CALCoutput`, and `SIMPLE_CALCresult` classes to represent the input, output, and results, respectively, to represent the request input and response output. For more information, see [Use iOS SDK generated by API Gateway for a REST API in Objective-C or Swift](how-to-generate-sdk-ios.md). 

1. Choose **Generate SDK**, and then follow the on-screen directions to download the SDK generated by API Gateway.

Follow the instructions in [Use iOS SDK generated by API Gateway for a REST API in Objective-C or Swift](how-to-generate-sdk-ios.md) to use the generated SDK.

 Every time you update an API, you must redeploy the API and regenerate the SDK to have the updates included.