The Google Custom Search Objective-C code sample may support developers to oversee their coding strategies. It works with iOS mobile and Mac OS X desktop applications. This code sample is available for custom search, blogger, books, calendar, google drive, google plus, tasks, URL shortener, and YouTube APIs.
Service discovery is not an easy task in today's Web. Discovering an API requires searching through a large number of services on the Internet and then reading pages of documentation to figure out how to use the ones that may match your application. This is the case in Programmable Web as well. The API directory shows over 5000 APIs which are manually categorized in over 50 service categories.