Swift is a fairly new language (2014), used to work on Objective-C in the Xcode environment, someone still uses it, but Swift is more convenient. On Swift, creating an application is much easier, it uses standard syntax (familiar to many) and if there is at least a little experience in programming, then master the language without difficulty.
To see what you programmed in real time without compilation, the language contains a special playground (which is very convenient).

Tutorial language programming Swift

Swift tutorial programming
Tutorial language Swift