Is there any difference between bool, Boolean, and BOOL in Objective-C?

Question

I know BOOL is actually a typedef of signed char, but what about Boolean?

What is the difference between bool, Boolean and BOOL?

Answer 1

If your new APIs have no need to interact with old ones, bool is more specific and clear than BOOL.

When building an non-Mac application with Xcode 9, BOOL v = 2; NSLog(@"%d", v); outputs "1", not "2".

Reference to Apple documentation