Using Mac computer we running out the latest version of Xcode. Xcode is Apple's IDE (Integrated Development Environment) for both Mac and iOS apps. ... Xcode includes the iOS SDK, tools, compilers, and frameworks you need specifically to design, develop, write code, and debug an app for iOS. When it comes down to it, there are really just two languages used for iOS development. The primary languages that dominate are Objective-C and Swift. Of course, you can use all kinds of different languages to code iOS apps, just like you can use a butter knife instead of a screwdriver to handle household repairs.