I was trying to make a simple Mac Objective-C application with Xcode to keep score of two players playing a simple game with up to 36 scores per player. It isn’t a very practical application because of its limited features, and it’s mostly for practice. I was trying to expand the application a bit with a Preferences window, which would pop up when a menu item was clicked.
I created a file to control the men item, then a nib to pop up when it’s clicked. All of this worked fine, and a new window would pop up. I put sliders, text fields, etc. on the nib, and connected them to actions. All of that worked fine.
The problem came when I tried to import the files into my root controller so that I could use the user’s choices in the application.
I got the following compiler error:
Command /Developer/usr/bin/clang failed with exit code 1
Along with all of this:
Ld
“/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper
Mac.app/Contents/MacOS/SimpleScoreKeeper Mac” normal x86_64
cd “/Users/myusername/Dropbox/iphone
app/SimpleScoreKeeper Mac”
setenv MACOSX_DEPLOYMENT_TARGET 10.6
/Developer/usr/bin/clang -arch x86_64 -isysroot
/Developer/SDKs/MacOSX10.6.sdk
-L/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug
-F/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug
-filelist
“/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper
Mac.build/Debug/SimpleScoreKeeper
Mac.build/Objects-normal/x86_64/SimpleScoreKeeper Mac.LinkFileList”
-mmacosx-version-min=10.6 -framework Cocoa -o
“/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper
Mac.app/Contents/MacOS/SimpleScoreKeeper Mac”ld: duplicate symbol _addScores in
/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper
Mac.build/Debug/SimpleScoreKeeper
Mac.build/Objects-normal/x86_64/Prefrences.o and
/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper
Mac.build/Debug/SimpleScoreKeeper
Mac.build/Objects-normal/x86_64/RootController.o for architecture
x86_64 clang: error: linker command failed with exit code 1 (use -v to
see invocation) Command /Developer/usr/bin/clang failed with exit code
1
The (possibly) related files in my project follow.
RootController.h - All the interface declarations for stuff in the MainMenu.xib window
RootController.m - Where I need to import the files to
MainMenu.xib - The nib owned by the RootController class
Preferences.h - A file I'd want to import, but it won't work.
Preferences.m - A file I'd (maybe) want to import, but it won't work.
Preferences.xib - The nib owned by the Preferences class.
PreferencesMenuController.h - Where I declare the clickPreferences action. (Liked to MainMenu.xib)
PreferencesMenuController.m - Where I say that clickPreferences opens up Preferences nib. (Linked to MainMenu.xib)
Is there a reason why I’d be getting this error? Is there something I need to do in the class I’m importing? Please be pretty detailed, I’m new to the language somight not know how to do certain things. And if there’s anything I need to clarify, let me know.
EDIT:
Here’s the code to the file I can’t import.
#import "Preferences.h"
@implementation Preferences
int addScores;
- (IBAction)addScoresToggled
{
NSLog(@"addScores was toggled.");
}
- (id)initWithWindow:(NSWindow *)window
{
self = [super initWithWindow:window];
if (self) {
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
- (void)windowDidLoad
{
[super windowDidLoad];
}
@end
You can also get this error of you accidentally include the implementation file rather than the header file. e.g. #import “MyClass.m” instead of #import “MyClass.h”