Question

What is difference between nil and Nil in iOS development?

And similarly what is difference between true and TRUE in iOS development?

Answer 1

I think this will help you understand the difference between nil and Nil.

Please find the below link:

Refer the answer of Damien_The_Unbeliever which states:

Googling “Nil vs nil” found this post http://numbergrinder.com/node/49, which states:

All three of these values represent null, or zero pointer, values. The
difference is that while NULL represents zero for any pointer, nil is
specific to objects (e.g., id) and Nil is specific to class pointers.
It should be considered a best practice of sorts to use the right null
object in the right circumstance for documentation purposes, even
though there is nothing stopping someone from mixing and matching as
they go along.

Link for that answer can be seen here:

What does 'Nil' represent in Obj-C?

EDIT-2:

Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?