Before you begin writing iOS Apps, you need to download and install Xcode from the App Store. Perform the following steps:
- Open the App Store on your Mac (it's in the Apple menu).
- In the search field in the top-right corner, type Xcode and press the Return key.
- You should see Xcode in the search results. Click Get and click Install.
- If you have an Apple ID, type it in the Apple ID text box. If you don't have one, click the Create Apple ID button and follow the step-by-step instructions to create one: