Xcode is an integrated development environment for the Mac operating system and it contains a suite of software development tools using which mobile applications can be created for the iOS app store. Xcode 5 comes with a cleaner user interface and more space for your content.
Objective C has many advantages over Swift when it comes to app development for iOS. One of the biggest advantages being when you have lot of audio or video task to accomplish iOS libraries render better in Objective C. In fact, learning Objective will also help you a lot with Swift as much of programming in iOS is to learn the frameworks.
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