iPhone上的Facebook登录导致“lang：错误：链接器命令失败”

Posted 2023-03-11

【中文标题】iPhone上的Facebook登录导致“lang：错误：链接器命令失败”

【英文标题】：Facebook Login on iPhone causes "lang: error: linker command failed"

【发布时间】：2015-03-03 18:55:33

【问题描述】：

以下是我的 UIViewController 用于请求 Facebook 登录和 publish_actions 权限。当我运行我的项目时，我得到了一个lang: error: linker command failed with exit code 1 (use -v to see invocation)，我也在下面提供了它。感谢您的帮助

UIViewController

#import "FacebookViewController.h"
#import <MobileCoreServices/MobileCoreServices.h>

@interface FacebookViewController ()<FBLoginViewDelegate>

@end

@implementation FacebookViewController

- (void)viewDidLoad 
    [super viewDidLoad];
    FBLoginView *loginview = [[FBLoginView alloc] init];

    loginview.frame = CGRectOffset(loginview.frame, 5, 5);
#ifdef __IPHONE_7_0
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0
    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) 
        loginview.frame = CGRectOffset(loginview.frame, 5, 5);
    
#endif
#endif
#endif
    loginview.delegate = self;

    [self.view addSubview:loginview];

    [loginview sizeToFit];


- (void)didReceiveMemoryWarning 
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.


#pragma mark - FBLoginViewDelegate

- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView 
    // ask for more permission
    if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) 
        // if we don't already have the permission, then we request it now
        [FBSession.activeSession requestNewPublishPermissions:@[@"publish_actions"]
                                              defaultAudience:FBSessionDefaultAudienceFriends
                                            completionHandler:^(FBSession *session, NSError *error) 
                                                if (!error) 
                                                    //No error therefore dismiss this VC
                                                    [self dismissThisViewController];

                                                 else if (error.fberrorCategory != FBErrorCategoryUserCancelled) 
                                                    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Permission denied"
                                                                                                        message:@"Unable to get permission to post"
                                                                                                       delegate:nil
                                                                                              cancelButtonTitle:@"OK"
                                                                                              otherButtonTitles:nil];
                                                    [alertView show];
                                                
                                            ];
    


- (void)loginView:(FBLoginView *)loginView handleError:(NSError *)error 
    // see https://developers.facebook.com/docs/reference/api/errors/ for general guidance on error handling for Facebook API
    // our policy here is to let the login view handle errors, but to log the results
    NSLog(@"FBLoginView encountered an error=%@", error);



-(void)dismissThisViewController

    //TODO


@end

错误

Ld /Users/myname/Library/Developer/Xcode/DerivedData/Appname-
dbqrudioiirqmvckhvljpnmkbhlu/Build/Intermediates/Appname.build/Debug-
iphonesimulator/Appname.build/Objects-normal/x86_64/Appname normal x86_64
    cd /my_git_dir/project_name/Appname_ios
    export IPHONEOS_DEPLOYMENT_TARGET=7.1
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk -
L/Users/myname/Library/Developer/Xcode/DerivedData/Appname-dbqrudioiirqmvckhvljpnmkbhlu/Build/Products/Debug-iphonesimulator -
F/Users/myname/Library/Developer/Xcode/DerivedData/Appname-dbqrudioiirqmvckhvljpnmkbhlu/Build/Products/Debug-iphonesimulator -F/my_git_dir/project_name/Appname_iOS/Appname_iOS -
F/Users/myname/Documents/FacebookSDK -filelist /Users/myname/Library/Developer/Xcode/DerivedData/Appname-
dbqrudioiirqmvckhvljpnmkbhlu/Build/Intermediates/Appname.build/Debug-iphonesimulator/Appname.build/Objects-normal/x86_64/Appname.LinkFileList -
Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -objc_abi_version -Xlinker 2 -ObjC -fobjc-arc -fobjc-link-runtime -Xlinker -
no_implicit_dylibs -mios-simulator-version-min=7.1 -framework AVFoundation -framework StoreKit -framework QuartzCore -framework
 AudioToolbox -lsqlite3 -framework FacebookSDK -lz -framework CoreLocation -framework SystemConfiguration -framework Security -framework 
MobileCoreServices -framework CFNetwork -framework Bolts -framework CoreTelephony -framework Parse -framework CoreGraphics -framework UIKit -
framework Foundation -Xlinker -dependency_info -Xlinker /Users/myname/Library/Developer/Xcode/DerivedData/Appname-
dbqrudioiirqmvckhvljpnmkbhlu/Build/Intermediates/Appname.build/Debug-iphonesimulator/Appname.build/Objects-
normal/x86_64/Appname_dependency_info.dat -o /Users/myname/Library/Developer/Xcode/DerivedData/Appname-
dbqrudioiirqmvckhvljpnmkbhlu/Build/Intermediates/Appname.build/Debug-iphonesimulator/Appname.build/Objects-normal/x86_64/Appname

…

duplicate symbol _OBJC_METACLASS_$_BFMeasurementEvent in:
    /Users/myname/Documents/FacebookSDK/FacebookSDK.framework/FacebookSDK(BFMeasurementEvent.o)
    /my_git_dir/project_name/Appname_iOS/Appname_iOS/Bolts.framework/Bolts(BFMeasurementEvent.o)
ld: 91 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


ld: 91 duplicate symbols for architecture arm64

【参考方案1】：

您在 Bolts 和 Facebook 框架中有重复的方法名称 BFMeasurementElement。先解决这个。螺栓框架

【讨论】：

我不知道螺栓是用来做什么的。我把它拿出来，它现在可以工作了。在我找到需要螺栓的原因之前，这是正确的答案。谢谢！