Xcode 配置常用变量（SRCROOT, PROJECT_DI

：环境变量宏（Build Setting Macros）引用格式：${MACRO}，同Build Phases Run Script中的语法。

PROJECT = HelloWorld

PROJECT_DIR=~/Projects/Learn Objective-C/HelloWorld

PROJECT_FILE_PATH =${PROJECT_DIR}/HelloWorld.xcodeproj

PROJECT_NAME = HelloWorld

SOURCE_ROOT =${PROJECT_DIR}

SRCROOT =${PROJECT_DIR}

SDKROOT = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk

SDK_DIR = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk

SDK_NAME = macosx10.9

Xcode $(SRCROOT)和$(PROJECT_DIR)区别