可达性ld:重复符号_OBJC_IVAR_$ _reach . localwifiref。

I include "Reachability/Reachability.m"

我把“可达性/ 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

我得到一个错误。

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-iphonesimulator/.. .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?

如何解决这个问题?它有什么关系呢?

4 个解决方案

#1

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

我遇到了同样的问题，因为我使用的第三方库(libPusher)已经包括了可达性。

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.

由于该库是预编译的，所以我不确定该做什么，但只增加了可达性。h对项目(而不是可达性)起作用。这允许我导入它并使用这个类，但是我没有重复的符号问题。

#2

You only import header files. Do,

您只导入头文件。做的,

#import "Reachability/Reachability.h"

#3

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

您必须确保您的项目文件夹包含一个可达性。h和可达性。m文件，ASIHTTPRequest库中都有这些文件，因此添加可达性库时，会出现重复的符号错误。删除重复的文件后，进行一个干净的构建。

#4

Removing the reference of reachability.m from the project.
消除可达性的参考。从项目。
Add Framework or files you want (which created this issue).
添加您想要的框架或文件(创建这个问题)。
Clean and Build project
清洁和建设项目

It worked for me.

它为我工作。

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

当我尝试在项目中添加框架时，这个重复的问题出现了。

#1