Objective-C programming is a lot of fun. Even if you are planning to use Swift to develop apps, you still need to know your Objective C. There are plenty of sites that can teach you how to get started with Objective-C programming. These 5 apps can also help you try Objective-C coding on your iOS device:
Objective-C Programming Language: you can compile and run programs with this app. You will need an internet connection to use it. Compilations are not free.
Objective C Reference: serves as a reference for Objective C. No internet connection is required to access the materials. It covers classes, constants, and other relevant topics.
Xcode Tutorials Pro: this app has 18 tutorials to help you get started with Xcode. Does not make you a genius app developer but shows you how to get started.
Code Viewer Pro: shows source code files and supports over 50 programming languages, including C, C++, JS, and Objective C.
Have you found better iOS apps for Objective C coding? Please include them here.