https://www.bignerdranch.com/blog/ios-developers-need-to-know-objective-c/
The Swift language lets the compiler do more work for the programmer.This is great—less typing for the programmer, right?—but it means thatwhen you look at a line of code, it won't mean much without a deepunderstanding of the context in which that line lives. Explicitlanguages are easier for beginners to understand.
So far, I've found Swift to be a tricky language to grasp from reading code samples alone. However, writing Swift code against frameworks I'm already familiar with through Objective-C, has proven much easier.
Aaron Hillegass literally wrote the book on Objective-C, so he should know.