
Objective-C is an approved language for iOS development but it has been gradually superseded by Swift by the businesses that focus their strategic efforts to deliver the highest quality products.
It is supported and promoted by Apple so there is an increase in popularity since its inception and as Apple is going to continue with it so if someone is looking for an Apple-specific development platform then Swift is going to be a must-know programming language.
Existing C programs can be adapted to make use of the software frameworks without losing any of the work as Objective-c is an extension of standard ANSI C. Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, tvOS, MacOS, etc.
Features that go in favor
Easier usage of private API’s
Difficult to find skilled Objective-C developers