一般我们在xcode里面配置包含工程目录下头文件的时候，都要关联着相对路径和绝对路径，如果只是自己用这个项目，用绝对路径的问题不大，但是如果你把工程发给别人，别人就要在改这个绝对路径，这时候绝对路径的缺点立马出现。
 
所以在修改User Header Search Paths这个选项的时候使用
"$(SRCROOT)/当前工程名字/需要包含头文件所在文件夹"
将上面的双引号里面的字符串拷贝之后，你会发现这个“$(SRCROOT)”，会自动变成当前工程所以的目录。
这样就可以了，发给别人，别人也不用在去修改路径了。
 
 
 
 
xcode4的环境变量，Build Settings参数，workspace及联编设置
一、xcode4中的环境变量
 
$(BUILT_PRODUCTS_DIR)
build成功后的，最终产品路径－－可以在Build Settings参数的Per-configuration Build Products Path项里设置
 
$(TARGET_NAME)
目标工程名称
 
$(SRCROOT)
工程文件（比如Nuno.xcodeproj）的路径
 
$(CURRENT_PROJECT_VERSION)
当前工程版本号
 
  
 
其他：
 
当编译静态库，设备选模拟器(iPhone 5.0 Simulator)，未设置任何Build Settings参数时，默认的基础路径：
 
/Users/xxx/Library/Developer/Xcode/DerivedData/xxxWorkspace-caepeadwrerdcrftijaolkkagbjf
 
下面用$()代替上面一长串东东
 
$(SYMROOT) = $()/Build/Products
 
$(BUILD_DIR) = $()/Build/Products
 
$(BUILD_ROOT) =  $()/Build/Products
 
这三个变量中的$()不会随着Build Settings参数的设置而改变
 
相反，以下可以通过设置而改变
 
$(CONFIGURATION_BUILD_DIR) = $()/Build/Products/Debug-iphonesimulator
 
$(BUILT_PRODUCTS_DIR) = $()/Build/Products/Debug-iphonesimulator
 
$(CONFIGURATION_TEMP_DIR) = $()/Build/Intermediates/UtilLib.build/Debug-iphonesimulator
 
$(TARGET_BUILD_DIR) = $()/Build/Products/Debug-iphonesimulator
 
$(SDK_NAME) = iphonesimulator5.0
 
$(PLATFORM_NAME) = iphonesimulator
 
$(CONFIGURATION) = Debug
 
$(TARGET_NAME) = UtilLib
 
$(EXECUTABLE_NAME) = libUtilLib.a 可执行文件名
 
${IPHONEOS_DEPLOYMENT_TARGET} 5.0
 
$(ACTION) = build
 
$(CURRENTCONFIG_SIMULATOR_DIR) 当前模拟器路径
 
$(CURRENTCONFIG_DEVICE_DIR) 当前设备路径
 
  
 
$(BUILD_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME =
 
$()/Build/Products/Debug-iphonesimulator
 
$(PROJECT_TEMP_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME) = $()/Build/Intermediates/UtilLib.build/Debug-iphonesimulator
 
  
 
自定义变量
 
${CONFIGURATION}-iphoneos 表示：Debug-iphoneos
 
${CONFIGURATION}-iphonesimulator 表示：Debug-iphonesimulator
 
$(CURRENTCONFIG_DEVICE_DIR) = ${SYMROOT}/${CONFIGURATION}-iphoneos
 
$(CURRENTCONFIG_SIMULATOR_DIR) = ${SYMROOT}/${CONFIGURATION}-iphonesimulator
 
自定义一个设备无关的路径（用来存放各种架构arm6/arm7/i386输出的产品）
 
$(CREATING_UNIVERSAL_DIR) = ${SYMROOT}/${CONFIGURATION}-universal
 
自定义变量代表的值
 
$(CURRENTCONFIG_DEVICE_DIR) ＝ $()/Build/Products/Debug-iphoneos
 
$(CURRENTCONFIG_SIMULATOR_DIR) = $()/Build/Products/Debug-iphonesimulator
 
$(CREATING_UNIVERSAL_DIR) = $()/Build/Products/Debug-universal
 
  
 
iphoneos5.0下的编译脚本：
 
xcodebuild -project "UtilLib.xcodeproj" -configuration "Debug" -target "UtilLib" -sdk "iphoneos5.0" -arch "armv6 armv7" build RUN_CLANG_STATIC_ANALYZER=NO  $(BUILD_DIR)="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}"
 
  
 
iphonesimulator5.0下的编译脚本：
 
xcodebuild -project "UtilLib.xcodeproj" -configuration "Debug" -target "UtilLib" -sdk "iphonesimulator5.0" -arch "i386" build RUN_CLANG_STATIC_ANALYZER=NO $(BUILD_DIR)="${BUILD_DIR}"  BUILD_ROOT="${BUILD_ROOT}"
 
加上下面一句表示输出到文件：
 
> "${BUILD_ROOT}.build_output"
 
  
 
lipo脚本工具：合并iPhone模拟器和真机的静态类库，生成通用库
 
lipo -create -output "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_DEVICE_DIR}/${EXECUTABLE_NAME}"         "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}"
 
意思是：把"${CURRENTCONFIG_DEVICE_DIR}目录下的.a文件，和${CURRENTCONFIG_SIMULATOR_DIR}目录下的.a文件合并，
 
在${CREATING_UNIVERSAL_DIR}目录下，生成两个设备都通用的静态库,
 
例如：lipo -create -output xy.a x.a y.a
 
  
 
二、xcode4中build Settings常见参数解析
 
1.Installation Directory：安装路径
 
静态库编译时，在Build Settings中Installation Directory设置“$(BUILT_PRODUCTS_DIR)”
 
Skip Install设为YES
 
Installation Directory默认为/usr/local/lib
 
因为Build Location默认时，.a文件会放在很长（比如：/Users/xxx/Library/Developer/Xcode/DerivedData/xxxProgram
 
dalrvzehhtesxdfqhxixzafvddwe/Build/Products/Debug-iPhoneos）的路径下，或是我们target指定的路径
 
Skip Install如果是NO,可能会被安装到默认路径/usr/local/lib
 
2.Public Headers Folder Path：对外公开头文件路径
 
设为“include”（具体的头文件路径为：$(BUILT_PRODUCTS_DIR)/include/xx.h）
 
在最终文件.a同级目录下生成一个include目录
 
默认：/usr/local/include
 
Public Headers Folder Path这个路径就是使用这lib的某工程需要依赖的外部头文件.导入这路径后，#include/import "xx.h"才能看到
 
3.User Header Search Paths：依赖的外部头文件搜索路径
 
设置为“$(BUILT_PRODUCTS_DIR)/include”
 
和2中路径对应
 
4.Per-configuration Build Products Path：最终文件路径
 
比如设为“../app”，就会在工程文件.xcodeproj上一层目录下的app目录里，创建最终文件
 
默认为$(BUILD_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
 
等于$(BUILT_PRODUCTS_DIR)
 
5.Per-configuration Intermediate Build Files Path：临时中间文件路径
 
默认为：$(PROJECT_TEMP_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
 
6.Code Signing Identity：真机调试的证书选择
 
选一个和Bundle identifier相对应的证书
 
Library Search Paths：库搜索路径
 
Architectures：架构，设为 armv6 或 armv7
 
Valid Architectures：应用框架，可以设为 armv6、 armv7 或i386
 
Product Name:工程文件名，默认为$(TARGET_NAME)
 
Info.plist File：info文件路径
 
Build Variants：默认为normal
 
Other Linker Flags：其他链接标签
 
设为“-ObjC”
 
当导入的静态库使用了类别，需要设为-ObjC
 
iOS Deployment Target：ios部署对象
 
比如可以选择设为，ios3到ios5的一种版本
 
Prefix Header：预编头文件（比如：UtilLib/UtilLib-Prefix.pch）
 
Precompile Prefix Header：设为“Yes”，表示允许加入预编译头
 
  
 
三、workspace（工作区）
 
作用：管理多个工程（project），多工程联编
 
  
 
四、workspace多工程联编设置
 
一、
 
1.新建一个静态库工程，比如UtilLib，并生成UtilLib.h和UtilLib.m文件
 
2.选中需要公开的头文件，
 
 
把右侧栏的Target Membership中设置为public
 
 
或则，选中工程目录target的Build Phases标签的copy headers项，在public中添加要公开的头文件
 
 
3.Architectures设为：armv6 armv7
 
4.Valid Architectures设为：armv6 armv7 i386
 
5.Build Products Path设为：$(SRCROOT)/../build
 
6.Per-configuration Build Products Path设为：
 
$(SRCROOT)/../build/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
 
7.Per-configuration Intermediate Build Files Path设为：
 
$(SRCROOT)/../build/$(TARGET_NAME).build/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
 
8.设置安装路径：Installation Directory项
 
 
9.设置对外公开的头文件路径：Public Headers Folder Path项
 
 
 
 
10.为静态库添加依赖的shell脚本
 
选中工程目录target的Build Phases标签，点击由下角的Add Build Phase按钮
 
 
在弹出的菜单里选择Add run script项，然后页面中会多出一个Run Script项
 
 
在黑框里填写"$SRCROOT/mergeArmSymbols.sh"
 
 
建立对此脚本的依赖（编译静态库的后会运行此脚本）
 
如果编译时设备选的是iphone simulator：
 
则此脚本会在对应iphone device的产品目录Debug-iphoneos中，生成对device有用的.a静态库，
 
相反，如果设备选的是iphone device：
 
则此脚本会在对应iphone simulator的产品目录Debug-iphoneos中，生成对simulator有用的.a静态库
 
最后，此脚本调用lipo工具，把本工程生成静态库与此脚本生成的静态库合并，生成simulator和device都通用的.a文件
 
  
 
11.具体bash shell脚本如下：
 
[plain] view plaincopy
mergeArmSymbols.sh 
 # Version 2.0 (updated for Xcode 4, with some fixes) 
    
 # Author: Adam Martin - http://twitter.com/redglassesapps 
 # Based on: original script from Eonil (main changes: Eonil's script WILL NOT WORK in Xcode GUI - it WILL CRASH YOUR COMPUTER) 
 # 
 # More info: see this Stack Overflow question: http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 
    
 #################[ Tests: helps workaround any future bugs in Xcode ]######## 
 # 
 DEBUG_THIS_SCRIPT="true" 
    
 if [ $DEBUG_THIS_SCRIPT = "true" ] 
 then 
 echo "########### TESTS #############" 
 echo "Use the following variables when debugging this script; note that they may change on recursions" 
 echo "BUILD_DIR = $BUILD_DIR" 
 echo "BUILD_ROOT = $BUILD_ROOT" 
 echo "CONFIGURATION_BUILD_DIR = $CONFIGURATION_BUILD_DIR" 
 echo "BUILT_PRODUCTS_DIR = $BUILT_PRODUCTS_DIR" 
 echo "CONFIGURATION_TEMP_DIR = $CONFIGURATION_TEMP_DIR" 
 echo "TARGET_BUILD_DIR = $TARGET_BUILD_DIR" 
 echo "SDK_NAME = $SDK_NAME" 
 echo "PLATFORM_NAME = $PLATFORM_NAME" 
 echo "CONFIGURATION = $CONFIGURATION" 
 echo "TARGET_NAME = $TARGET_NAME" 
 echo "ARCH_TO_BUILD = $ARCH_TO_BUILD" 
 echo "ARCH_TO_BUILD = $ARCH_TO_BUILD" 
 echo "ACTION = $ACTION" 
 echo "SYMROOT = $SYMROOT" 
 echo "EXECUTABLE_NAME = $EXECUTABLE_NAME" 
 echo "CURRENTCONFIG_SIMULATOR_DIR = $CURRENTCONFIG_SIMULATOR_DIR" 
 echo "CURRENTCONFIG_DEVICE_DIR = $CURRENTCONFIG_DEVICE_DIR" 
    
 echo "#############Other###########" 
 echo "BUILD_DIR/CONFIGURATION/EFFECTIVE_PLATFORM_NAME = $BUILD_DIR/$CONFIGURATION$EFFECTIVE_PLATFORM_NAME" 
    
 echo "PROJECT_TEMP_DIR/CONFIGURATION/EFFECTIVE_PLATFORM_NAME = $PROJECT_TEMP_DIR/$CONFIGURATION$EFFECTIVE_PLATFORM_NAME" 
    
 fi 
    
 #####################[ part 1 ]################## 
 # First, work out the BASESDK version number 
 #    (incidental: searching for substrings in sh is a nightmare! Sob) 
    
 SDK_VERSION=$(echo ${SDK_NAME} | grep -o '.\{3\}$') 
    
 # Next, work out if we're in SIM or DEVICE 
    
 if [ ${PLATFORM_NAME} = "iphonesimulator" ] 
 then 
 OTHER_SDK_TO_BUILD=iphoneos${SDK_VERSION} 
 ARCH_TO_BUILD="armv6 armv7" 
 else 
 OTHER_SDK_TO_BUILD=iphonesimulator${SDK_VERSION} 
 ARCH_TO_BUILD="i386" 
 fi 
    
 echo "XCode has selected SDK: ${PLATFORM_NAME} with version: ${SDK_VERSION} (although back-targetting: ${IPHONEOS_DEPLOYMENT_TARGET})" 
 echo "...therefore, OTHER_SDK_TO_BUILD = ${OTHER_SDK_TO_BUILD}" 
 # 
 #####################[ end of part 1 ]################## 
    
 #####################[ part 2 ]################## 
 # 
 # IF this is the original invocation, invoke whatever other builds are required 
 # 
 # Xcode is already building ONE target... build ONLY the missing platforms/configurations. 
    
 if [ "true" == ${ALREADYINVOKED:-false} ] 
 then 
 echo "RECURSION: Not the root invocation, don't recurse" 
 else 
 # Prevent recursion 
 export ALREADYINVOKED="true" 
    
 echo "RECURSION: I am the root... recursing all missing build targets..." 
 echo "RECURSION: ...about to invoke: xcodebuild -configuration \"${CONFIGURATION}\" -target \"${TARGET_NAME}\" -sdk \"${OTHER_SDK_TO_BUILD}\" -arch \"${ARCH_TO_BUILD}\" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO" 
 xcodebuild -project "${TARGET_NAME}.xcodeproj" -configuration "${CONFIGURATION}" -target "${TARGET_NAME}" -sdk "${OTHER_SDK_TO_BUILD}" -arch "${ARCH_TO_BUILD}" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}" > "${BUILD_ROOT}.build_output" 
 ACTION="build" 
    
 # Merge all platform binaries as a fat binary for each configurations. 
    
 # Calculate where the (multiple) built files are coming from: 
 CURRENTCONFIG_DEVICE_DIR=${SRCROOT}/../build/${CONFIGURATION}-iphoneos 
 CURRENTCONFIG_SIMULATOR_DIR=${SRCROOT}/../build/${CONFIGURATION}-iphonesimulator 
    
 echo "Taking device build from: ${CURRENTCONFIG_DEVICE_DIR}" 
 echo "Taking simulator build from: ${CURRENTCONFIG_SIMULATOR_DIR}" 
    
 CREATING_UNIVERSAL_DIR=${SRCROOT}/../build/${CONFIGURATION}-universal 
 echo "...outputing a universal arm6/arm7/i386 build to: ${CREATING_UNIVERSAL_DIR}" 
    
 # ... remove the products of previous runs of this script 
 #      NB: this directory is only created by this script - it should be safe to delete 
    
 rm -rf "${CREATING_UNIVERSAL_DIR}" 
 mkdir "${CREATING_UNIVERSAL_DIR}" 
    
 # 
 echo "lipo: for current configuration (${CONFIGURATION}) creating output file: ${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" 
 lipo -create -output "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_DEVICE_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}" 
    
 #######custom######## 
 #copy universal lib to ../libs 
 libsDir=../libs 
 includeDir=../include 
    
 rm -rf "${libsDir}" 
 mkdir -p "${libsDir}" 
    
 echo "cp -R ${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME} ${libsDir}" 
    
 cp -R "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${libsDir}" 
    
 echo "cp -R ${CURRENTCONFIG_DEVICE_DIR}/include ${includeDir}" 
    
 cp -R "${CURRENTCONFIG_DEVICE_DIR}/include" "${includeDir}" 
    
 fi 
 
 
下载右边的图片，然后把后缀改为.sh（其实就是上面的脚本，因为博客园只能上传图片)
 
静态库编译后的目录结构如下：
 
 
 
  
 
二、
 
1.新建主工程，比如Nuno，添加对静态库的依赖
 
点击工程，在Build Phases标签的Link Binary With Libraries项中点击加号添加UtilLib.a库
 
 
 
 
选中上面的红色项，在右边栏的Location选Relative to Project，把值设为../libs/libUtilLib.a
 
2.设置主工程依赖的外部头文件路径：User Header Search Paths项
 
$(SRCROOT)/../include
 
3.设置Header Search Paths为：$(SRCROOT)/../include
 
4.设置Library Search Paths为：$(SRCROOT)/../libs
 
编译运行即可实现联编
 
  
 
(备注：选择模拟器iphone 5.0 simulator，编译静态库的时，最终文件会在Debug-iphonesimulator，就算成功.a文件还是红色，
 
这是可能是xcode的bug，不会自动切换路径
 
因为$(BUILT_PRODUCTS_DIR)所指的位置，是build/Debug-iphonesos,不是包含最终.a文件的Debug-iphonesimulator；
 
选择ios Device，编译成的最终文件才在build/Debug-iphonesos下，.a文件变成非红色
 
所有得用mergeArmSymbols.sh脚本来解决）
 
 
 
reference:
http://blog.sina.com.cn/s/blog_6de18992010190kk.html
http://www.cnblogs.com/xiaodao/archive/2012/03/28/2422091.html