c++,ios,objective-c,uiviewcontroller , (iOS) How can I get the UIViewController from a C++ Application?


(iOS) How can I get the UIViewController from a C++ Application?

Question:

Tag: c++,ios,objective-c,uiviewcontroller

I need to use a library in my C++ project that needs to call an extern function:

SetGameViewController(UIViewController* gameViewController)

I have zero knowledge of Objective C and iOS yet. I need to get UIViewController and pass it to that function.

So this code should get the UIViewController:

UIWindow *window = [UIApplication sharedApplication].keyWindow;
UIViewController *rootViewController = window.rootViewController;

I also added this import:

#if defined(OS_IPHONE)
     #import <UIKit/UIKit.h>
#endif

I get compiler errors like:

Expected unqualified-id
Unknown type name 'NSString'

I've started learning Objective C and read a few articles but couldn't get much further than that yet. So basically my question is how do I basically import and use Objective C code in C++ code so that I can get and use the UIViewController?


Answer:

Easiest way will be to rename your source file with the extension ".mm" - it will then be compiled as objective-c++, which means you get all the wonders of c++ while still being able to interact with objective-c objects (counted pointers to things 'derived' from NSObject).


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