Error "_OBJC_CLASS _ $ _ AppDelegate" referenced by: "and error: linker command with exit code 1 worked (use -v to call the call)"

Question

I am new to development and I got this error, I am not shire if I have something missing in my AppDelegate files, so I will show you the files.

h file

#import <UIKit/UIKit.h> @interface AppDelegate: UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @end 

m file

 #import "AppDelegate.h" 

The fact is that I think that I deleted something from the te m file, but I can’t remember what it was.

here is the complete error message:

Undefined characters for x86_64 architecture: "_OBJC_CLASS _ $ _ AppDelegate" referenced: objc-class-ref in main.o ld: character (s) not found for x86_64 architecture clang: error: linker command failed with exit code 1 (use -v to call the call)

Answer 1

You need to make sure that your AppDelegate.m added to the "Compilation Sources" in your target settings.

To do this, click on the project (top left in the Xcode window) → Go to the Phase Assembly tab → Compile Sources , and then check AppDelegate.m actually added to the list. If not, click + → Type AppDelegate.m → Select, and then Add . It has to be done.