在Xcode 项目执行：Run Script 时，则标识：${SYMROOT} . 更改括号类型。
例如：BUILD 号自增，编译完成后自动copy 某文件至目标文件夹等：
cp -R ${BUILD_DIR}/${CONFIGURATION}-iphoneos/XXXX.bundle ${SRCROOT}/../XXXProject/
具体环境变量如下：
$(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
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