These days, Objective-C has fewer updates, most of which are for compatibility with Swift (e.g. easy import to the Swift code). Swift was created as an interoperable language, so it is completely compatible with Objective-C. This means it is possible to combine these languages in a project.
Programming in Objective-C will not become obsolete any time soon because, thanks to its 20 years of existence, it has a large code base, number of apps maintained, and third-party framework with Objective-C at its core. These solutions and libraries are unlikely to be rebuilt from scratch with a new language. This is the only reason why Objective-C is better than Swift to some extent. Thus, Swift is not going to replace Objective-C, especially at this stage.
Recommendation for When To Use Objective-C
There are two options where it could be still preferable to use Objective-C:
1- If an app has already been written in Objective-C and has a huge code base (100,000+ code lines)
2- If you are developing a framework use Objective-C
3- If C or C++ third-party frameworks are used extensively
Swift Use Cases
LinkedIn, a social network for professionals moved from Objective-C to Swift in their native app development. In 2016, there was a great speech presenting the reasoning behind this decision for the company. The bottom line was that Swift was the better choice for smaller and start-up projects, as was easier to work with.
Another company, Lyft, an on-demand transportation company, uses Swift for its native iOS app development.
Other well-known apps like Yahoo Weather, Clear, Hipmunk, WordPress and Firefox iOS apps are also using Swift.
Objective-C, when compared to Swift, is a more outdated language and lacks modern tools and properties. Swift has many updates and ongoing growth plans, and the language receives great support from Apple. It is an easy-to-learn, secure, modern, and interactive programming language. Swift has simplified coding patterns as well as coding interface vs Objective-C.
Follow this article to find out full information with a detailed Swift vs Objective-C comparison.