Yes, you can do reverse engineering on iOS apps. However, it is more difficult than on Android because iOS apps are typically signed with a certificate that prevents them from being modified. There are a few ways to get around this, such as using a jailbreak or using a tool like XcodeGhost.
Once you have bypassed the signing protection, you can use a tool like Hopper Disassembler to decompile the app's code. This will give you a high-level view of the app's functionality, but you may need to do some additional reverse engineering to understand the code in detail.
Reverse engineering iOS apps can be a useful way to learn about how they work and to find security vulnerabilities. However, it is important to note that reverse engineering is illegal in some countries, so be sure to check the laws in your area before you start.
Here are some additional resources that you may find helpful: