Reachability ld: duplicate symbol _OBJC_IVAR_$_Reachability.localWiFiRef

I include "Reachability/Reachability.m"

AppDelegate.h

#import <UIKit/UIKit.h>
#import "Reachability/Reachability.m"

@class ...;

@interface ... : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    ... *viewController;
    Reachability *hostReach;
    NetworkStatus netStatus;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (nonatomic) NetworkStatus netStatus;
-(void)updateInterfaceWithReachability: (Reachability*) curReach;

@end


AppDelegate.m


#import "AppDelegate.h"
#import "ViewController.h"

@implementation ...

@synthesize window=_window;
@synthesize navigationController=_navigationController;
@synthesize netStatus;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    // Override point for customization after application launch.
    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];
    hostReach = [[Reachability reachabilityWithHostName:@"www.apple.com"]retain];
    [hostReach startNotifier];
    [self updateInterfaceWithReachability:hostReach];


    // Set the view controller as the window's root view controller and display.
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];

    return YES;
}

and I get an error

ld: duplicate symbol _OBJC_IVAR_$_Reachability.localWiFiRef in /Users/../Documents/../build/.. .build/Debug-iphonesimulator/.. .build/Objects-normal/i386/..ViewController.o and /Users/../Documents/../build/.. .build/Debug-iphonesimul开发者_StackOverflow中文版ator/.. .build/Objects-normal/i386/..AppDelegate.o

Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

how to solve this problem? and what it might be related?

---

I was having the same problem because one third-party library (libPusher) I'm using was including Reachability already.

Since that library was pre-compiled, I wasn't sure what to do, but adding only Reachability.h to the project (and not Reachability.m) worked. That allowed me to import it and use the class but I didn't have the duplicate symbol issue.

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You only import header files. Do,

#import "Reachability/Reachability.h"

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you have to make sure your project folder contains one Reachability.h and one Reachability.m files , ASIHTTPRequest library has both these files in it hence the duplicate symbol error when adding the Reachability library. after removing the duplicate files do a clean build

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1. Removing the reference of reachability.m from the project.
2. Add Framework or files you want (which created this issue).
3. Clean and Build project

It worked for me.

when i tried adding framework in project, and this duplicate issue appeared.