“Cannot find interface declaration for NSObject”?

Question

So I\'ve done some research into this issue, but I haven\'t found anything similar just yet...

So I\'m coding a game in Obj-C using Xcode and Sparrow Framework. I\'v

Answer 1

This can be caused by not including UIKit.

Add this to your header:

#include <UIKit/UIKit.h>

Also make sure to add the UIKit Framework to your project. (Targets/Build Phases/Link Binary With Libraries/ -- Select Add --- Add UIKit.Framework)

Answer 2

Try this instead for Cocoa or iOS app, make sure to import "Foundation/Foundation.h" in your class where you are inheriting NSObject class.

Answer 3

Try deleting the derived data for the project. You can do that through the organiser, under projects. You might have a corrupt precompiled header.

Answer 4

I faced a similar error, resolved it when I noticed I had done something remarkably stupid.

In my foo.m file, I had forgotten to #import "foo.h"

The error got fixed when I added the import line.

Answer 5

Make sure that you don't use a Class Name that is already taken. I've had the same problem when i named one of my Classes "Signal", which is already part of Foundation.

Answer 6

Also make sure you're not including an Objective-C file from a .cpp or .c file.

Example: a PhotoManager.mm might include the header file from the Objective-C pair PhotoObject.h/PhotoObject.mm. Then, if MyAwesomeCppFile.cpp includes PhotoManager.h, suddenly PhotoObject.h doesn't know the basic Objective-C classes and keywords.

A solution would be to use #ifdef __OBJC__ if you can get away with it.

Otherwise designate the .cpp file type as Objective-C++ Source in the file's properties panel (Top right window control => "Identity and type")