Here I have a list of most frequently used other linker flags in iOS mentioned below.
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-ObjC, -all_load, -force_load

1. What is the use of -ObjC linker flag ?
2.What is the use of -all_load ?
3. What is the use of -force_load ?

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You cannot just return something in Objective C  to Unity expect it to appear in Unity / C#. 
It's basically a two way communication.If you look at the asset store you can get several plugins to achieve this functionality.

In order to exchange message between Objective C and Unity,we need to follow the steps below.