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YESInstallation 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/xxxProgramdalrvzehhtesxdfqhxixzafvddwe/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/lib2.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：$(BUILT_PRODUCTS_DIR)/include/xx.h）在最终文件.a同级目录下生成一个include目录默认：/usr/local/includePublic Headers Folder Path这个路径就是使用这lib的某工程需要依赖的外部头文件.导入这路径后，#include/import "xx.h"才能看到3.User Header Search Paths：依赖的外部头文件搜索路径设置为“$(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)$(EFFECTIVE_PLATFORM_NAME)6.Code Signing Identity：真机调试的证书选择选一个和Bundle identifier相对应的证书Library Search Paths：库搜索路径Architectures：架构，设为 armv6 或 armv7Valid Architectures：应用框架，可以设为 armv6、 armv7 或i386Product Name:工程文件名，默认为$(TARGET_NAME)Info.plist File：info文件路径Build Variants：默认为normalOther 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-ObjCiOS 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 armv74.Valid Architectures设为：armv6 armv7 i3865.Build Products Path设为：$(SRCROOT)/../build6.Per-configuration Build Products Path设为：$(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 plaincopymergeArmSymbols.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" "${includeDir}" fi 下载右边的图片，然后把后缀改为.sh（其实就是上面的脚本，因为博客园只能上传图片)静态库编译后的目录结构如下： 二、 1.新建主工程，比如Nuno，添加对静态库的依赖点击工程，在Build Phases标签的Link Binary With Libraries项中点击加号添加UtilLib.a库选中上面的红色项，在右边栏的Location选Relative to Project，把值设为../libs/libUtilLib.a2.设置主工程依赖的外部头文件路径：User Header Search Paths项$(SRCROOT)/../include3.设置Header Search Paths为：$(SRCROOT)/../include4.设置Library Search Paths为：$(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.htmlhttp://www.cnblogs.com/xiaodao/archive/2012/03/28/2422091.html