In iOS do we have something like Gradle Build Flavors on Android.
Basically I want to integrate Applause SDK with my app but I dont want that code to be part of the rel
You can make use of Schemes and Build configurations in Xcode. Here's the official documentation: https://developer.apple.com/library/ios/recipes/xcode_help-project_editor/Articles/BasingBuildConfigurationsonConfigurationFiles.html
After you create a build configuration, you should edit your scheme to use that build configuration. For that click on your scheme and select Edit Scheme.
In short, the process is:
#ifdef APP_STORE
//do something
#endif