To develop native mobile applications with Titanium you need to have the SDKs installed for your target platform. For instance, to develop Android applications you need the Android SDK and toolchain installed, and XCode to develop iOS applications. You can either use Studio's Platform Configuration tool to automate the installation process or install these SDKs manually.
Studio Platform Configuration Tool
Since Studio 3.2.0, Studio provides the Platform Configuration tool to make it easier to install, configure and update native platform SDKs on your system. This tool is automatically launched when Studio first starts after being installed, or when creating a new project with an unconfigured platform. You may also launch the tool through the Studio Dashboard Get Started tab by selecting an SDK to configure.
When the Platform Configuration dialog opens, this dialog indicates which platform SDKs are installed and which are not, and lets you easily install individual SDKs. In the following screenshot, the system has none of the native SDKs installed.
In the dialog, select the SDKs you want to install and optionally click Settings to specify a few basic settings for each (described in more detail the below sections). Click Configure to start the installation process.
Studio begins downloading and installing each SDK you selected, according to the settings you specified. In the case of iOS, Studio launches the App Store application installed on your Mac to the XCode download page.
You specify where to install the SDK and which versions to install. By default, the minimum supported version (currently 2.3.3) and the latest available version (currently 4.4) are selected. To build applications for other versions of Android, select the appropriate Android SDKs from the settings view.
There aren't any special settings for iOS, as you only need to install the Xcode developer toolset.
For advanced platform configurations or setting up the platform SDKs for use with the Titanium CLI, refer to the following installation guides: