ios SRCROOT 和 PROJECT_DIR 有什么区别？
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What the different between SRCROOT and PROJECT_DIR?
提问by childrenOurFuture
In Xcode, we have to configure many paths in the Build Settings, then we will deal with the $(SRCROOT)and $(PROJECT_DIR), But what the difference between them, can you show me an example, thx a lot.
在Xcode中，我们必须在Build Settings中配置很多路径，然后我们将处理$(SRCROOT)和$(PROJECT_DIR)，但是它们之间有什么区别，你能举个例子吗，谢谢。
采纳答案by SwiftArchitect
Exchangeable in practice, while the documentation makes these subtle theoretical distinctions:
在实践中可交换，而文档则做出了这些微妙的理论区别：
SRCROOTDirectory path. Identifies the directory containing the target'ssource files: contains the path to the projectfile that defines the target.
SOURCE_ROOTis an undocumented alias toSRCROOTPROJECT_DIR
Identifies the directory containing the project(.xcodeproj)$(PROJECT_DIR)/buildis used as the create the default value for:- Intermediate Build Files Path
OBJROOT - Build Products Path
SYMROOT
Typically these paths are not set per target, but are set per-project or per-user.
- Intermediate Build Files Path
PROJECT_FILE_PATH
Identifies the project itself.
Equivalent to$(PROJECT_DIR)/$(PROJECT_NAME).xcodeproj
SRCROOT目录路径。标识包含目标源文件的目录：包含定义目标的项目文件的路径。
SOURCE_ROOT是一个未记录的别名SRCROOTPROJECT_DIR
标识包含项目的目录(.xcodeproj)$(PROJECT_DIR)/build用作创建默认值：- 中间构建文件路径
OBJROOT - 构建产品路径
SYMROOT
通常，这些路径不是按目标设置的，而是按项目或按用户设置的。
- 中间构建文件路径
PROJECT_FILE_PATH
标识项目本身。
相当于$(PROJECT_DIR)/$(PROJECT_NAME).xcodeproj
Conceptually different (#1 is about the project which defines the targetwhile #2 is about the project independentlyof any target), they are always pointing to the same location since you are, in essence, always building a target.
在概念上不同（#1 是关于定义目标的项目，而#2 是关于独立于任何目标的项目），它们总是指向同一个位置，因为本质上你总是在构建一个目标。
References
参考
Xcode 8.3 Build Settings reference
Xcode Build System Guide(Retired 2016-09-29)
Xcode 8.3 Build Settings 参考
Xcode Build System Guide(Retired 2016-09-29)
回答by Baig
SRCROOT& PROJECT_DIRare same macros have same effect.PROJECT_DIRmakes more sense when talking about frameworks.
SRCROOT&PROJECT_DIR是相同的宏具有相同的效果。PROJECT_DIR在谈论框架时更有意义。
