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，但是如果协作开发，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。
一、xcode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)
工程根目录（一般为.xcodeproj所在目录）
$(PROJECT_DIR)
.xcodeproj所在目录
$(CURRENT_PROJECT_VERSION)
当前工程版本号
其他：
$() xcode数据目录该工程根目录
$(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、xcode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）