I need step by step instruction on how to setup and write first test for iOS app. This can be done using eclipse or Intellij and Appium studio plugin.
Here is the step by step method to setup Eclipse and intelij respectively
Eclipse - https://docs.experitest.com/display/TC/Appium+Studio+for+Eclipse
InteliJ - https://docs.experitest.com/display/TC/Appium+Studio+for+IntelliJ