为什么即使删除了引起它们的文件，我的iOS项目中仍然仍然存在mach-o链接器错误？

问题描述

| 这些是错误：

Ld /Users/gearhead2727/Library/Developer/Xcode/DerivedData/TR-bwdsurqqtlxmnhdpvfqmdqftqsun/Build/Intermediates/TR.build/Debug-iphoneos/TR.build/Objects-normal/armv6/TR normal armv6
    cd /Users/gearhead2727/DropBox/TR
    setenv IPHONEOS_DEPLOYMENT_TARGET 4.0.1
    setenv PATH \"/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin\"
    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk -L/Users/gearhead2727/Library/Developer/Xcode/DerivedData/TR-bwdsurqqtlxmnhdpvfqmdqftqsun/Build/Products/Debug-iphoneos \"-L/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.2 (8H7)/Symbols/usr/lib\" -F/Users/gearhead2727/Library/Developer/Xcode/DerivedData/TR-bwdsurqqtlxmnhdpvfqmdqftqsun/Build/Products/Debug-iphoneos -F/Users/gearhead2727/DropBox/TR/../../Downloads -filelist /Users/gearhead2727/Library/Developer/Xcode/DerivedData/TR-bwdsurqqtlxmnhdpvfqmdqftqsun/Build/Intermediates/TR.build/Debug-iphoneos/TR.build/Objects-normal/armv6/TR.LinkFileList -dead_strip -ObjC -miphoneos-version-min=4.0.1 -framework Foundation -framework UIKit -framework CoreGraphics -framework AddressBookUI -lz.1.1.3 -lsqlite3.0 -framework SystemConfiguration -framework Security -framework QuartzCore -framework CFNetwork -framework CoreLocation -framework MapKit -framework AddressBook -framework GameKit -framework AVFoundation -framework MessageUI -lxml2 -framework StoreKit -o /Users/gearhead2727/Library/Developer/Xcode/DerivedData/TR-bwdsurqqtlxmnhdpvfqmdqftqsun/Build/Intermediates/TR.build/Debug-iphoneos/TR.build/Objects-normal/armv6/TR

Undefined symbols for architecture armv6:
  \"_class_addMethod\",referenced from:
      _SHKSwizzle in SHK.o
  \"__objc_empty_vtable\",referenced from:
      _OBJC_MetaCLASS_$_TRAppDelegate in TRAppDelegate.o
      _OBJC_CLASS_$_TRAppDelegate in TRAppDelegate.o
      _OBJC_MetaCLASS_$_TRViewController in TRViewController.o
      _OBJC_CLASS_$_TRViewController in TRViewController.o
      _OBJC_MetaCLASS_$_SBet in SBet.o
      _OBJC_CLASS_$_SBet in SBet.o
      _OBJC_MetaCLASS_$_RaceView in RaceView.o
      ...
  \"_method_getTypeEncoding\",referenced from:
      _SHKSwizzle in SHK.o
  \"___objc_personality_v0\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"_ceil\",referenced from:
      _EstimateBas64EncodedDataSize in Base64Transcoder.o
      -[FBDialog sizetoFitOrientation:] in FBDialog.o
      -[FBDialog drawRect:] in FBDialog.o
  \"_sel_registerName\",referenced from:
      -[NSObject(WeakLinking) findSelectorForProperty:named:forReading:] in NSObject+WeakLinking.o
  \"_class_getInstanceMethod\",referenced from:
      _SHKSwizzle in SHK.o
  \"_floor\",referenced from:
      -[FBDialog sizetoFitOrientation:] in FBDialog.o
      -[FBDialog show] in FBDialog.o
  \"_CC_MD5\",referenced from:
      -[FBRequest md5HexDigest:] in FBRequest.o
  \"_objc_getProperty\",referenced from:
      -[SHKOAuthSharer signatureProvider] in SHKOAuthSharer.o
      -[SHKOAuthSharer accesstoken] in SHKOAuthSharer.o
      -[SHKOAuthSharer requestToken] in SHKOAuthSharer.o
      -[SHKOAuthSharer consumer] in SHKOAuthSharer.o
      -[SHKSharer request] in SHKSharer.o
      -[SHKSharer pendingForm] in SHKSharer.o
      -[SHKSharer item] in SHKSharer.o
      ...
  \"_objc_setProperty\",referenced from:
      -[TRAppDelegate setwindow:] in TRAppDelegate.o
      -[TRAppDelegate setViewController:] in TRAppDelegate.o
      -[TRViewController setGameCenterManager:] in TRViewController.o
      -[TRViewController setCurrentleaderboard:] in TRViewController.o
      -[FacebookAgent setUserInfo:] in FacebookAgent.o
      -[FacebookAgent setPermissionStatus:] in FacebookAgent.o
      -[FacebookAgent setUploadImageAlbum:] in FacebookAgent.o
      ...
  \"_objc_enumerationMutation\",referenced from:
      -[SHK showViewController:] in SHK.o
      +[SHK favoriteSharersForType:] in SHK.o
      +[SHK logoutOfAll] in SHK.o
      +[SHK flushOfflineQueue] in SHK.o
      +[SHKOAuthSharer logout] in SHKOAuthSharer.o
      -[SHKSharer isAuthorized] in SHKSharer.o
      -[SHKSharer authorizationFormSave:] in SHKSharer.o
      ...
  \"_objc_sync_enter\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"_class_replaceMethod\",referenced from:
      _SHKSwizzle in SHK.o
  \"_CCHmac\",referenced from:
      -[OAHMAC_SHA1SignatureProvider signClearText:withSecret:] in OAHMAC_SHA1SignatureProvider.o
  \"_property_getAttributes\",referenced from:
      -[NSObject(WeakLinking) findSelectorForProperty:named:forReading:] in NSObject+WeakLinking.o
  \"__objc_empty_cache\",referenced from:
      _OBJC_MetaCLASS_$_TRAppDelegate in TRAppDelegate.o
      _OBJC_CLASS_$_TRAppDelegate in TRAppDelegate.o
      _OBJC_MetaCLASS_$_TRViewController in TRViewController.o
      _OBJC_CLASS_$_TRViewController in TRViewController.o
      _OBJC_MetaCLASS_$_SBet in SBet.o
      _OBJC_CLASS_$_SBet in SBet.o
      _OBJC_MetaCLASS_$_RaceView in RaceView.o
      ...
  \"_method_getImplementation\",referenced from:
      _SHKSwizzle in SHK.o
  \"_class_getProperty\",referenced from:
      -[NSObject(WeakLinking) findSelectorForPropertyNamed:forReading:] in NSObject+WeakLinking.o
  \"_round\",referenced from:
      +[SHKActivityIndicator currentIndicator] in SHKActivityIndicator.o
      -[SHKActivityIndicator setCenterMessage:] in SHKActivityIndicator.o
      -[SHKActivityIndicator showSpinner] in SHKActivityIndicator.o
      -[SHKFormFieldCell layoutSubviews] in SHKFormFieldCell.o
  \"_objc_sync_exit\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"__Unwind_SjLj_Unregister\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"_objc_msgSend\",referenced from:
      -[TRAppDelegate application:didFinishLaunchingWithOptions:] in TRAppDelegate.o
      -[TRAppDelegate dealloc] in TRAppDelegate.o
      -[TRViewController madeTurtle] in TRViewController.o
      -[TRViewController soundButtonPress:] in TRViewController.o
      -[TRViewController alertView:diddismissWithButtonIndex:] in TRViewController.o
      -[TRViewController launchTurtleMaker:] in TRViewController.o
      -[TRViewController pressRestart:] in TRViewController.o
      ...
  \"_method_exchangeImplementations\",referenced from:
      _SHKSwizzle in SHK.o
  \"_objc_msgSendSuper2\",referenced from:
      -[TRAppDelegate dealloc] in TRAppDelegate.o
      -[TRViewController dealloc] in TRViewController.o
      -[TRViewController didReceiveMemoryWarning] in TRViewController.o
      -[SBet initWithFrame:] in SBet.o
      -[SBet dealloc] in SBet.o
      -[LoadedTurtleView viewDidLoad] in LoadedTurtleView.o
      -[FacebookAgent initWithApiKey:ApiSecret:ApiProxy:] in FacebookAgent.o
      ...
  \"__Unwind_SjLj_Resume\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"__Unwind_SjLj_Register\",referenced from:
      +[FBTranslationsLoader sharedInstance] in FBTranslationsLoader.o
  \"_objc_msgSend_stret\",referenced from:
      -[RaceView useSpeedTurt] in RaceView.o
      -[RaceView beginRace] in RaceView.o
      -[RaceView viewDidLoad] in RaceView.o
      -[RaceView moveTurtles] in RaceView.o
      -[TurtleMakerController addImage:addImage:addImage:addImage:] in TurtleMakerController.o
      -[UserRaceView viewDidLoad] in UserRaceView.o
      -[UserRaceView uMoveButton:] in UserRaceView.o
      ...
ld: symbol(s) not found for architecture armv6
collect2: ld returned 1 exit status

当我添加ASIHTTPREQUEST时得到了它们，并且删除了ASIHTTPREQUEST，错误仍然存​​在。在添加ASITHTTPREQUEST之前，没有错误，因此请帮助我摆脱错误。     

解决方法

        尝试： 退出xcode rm -rf〜/库/开发人员/ Xcode / DerivedData / rm -rf <项目目录> / build 看起来您似乎可能由于错误而缺少基本库之一。在添加asihttprequest之前，尝试将.xcodeproj还原为一个版本吗？