CMAKE_OSX_DEPLOYMENT_TARGET在iOS环境下不生效的问题求助

参考相关内容后，我在CMake中按如下方式指定CMAKE_OSX_DEPLOYMENT_TARGET：

cmake_minimum_required(VERSION 3.21.3)

if (APPLE)
    #The variable CMAKE_OSX_DEPLOYMENT_TARGET must initialized as a cache variable prior to the first project() command
    if(IOS)
        set(CMAKE_OSX_DEPLOYMENT_TARGET "14.0" CACHE STRING "Minimum iOS deployment version")
    else()
        set(CMAKE_OSX_DEPLOYMENT_TARGET "11.0" CACHE STRING "Minimum MacOS deployment version")
    endif()
endif()

project(MyApp LANGUAGES CXX)

使用Xcode生成器运行CMake时，MacOS环境下Xcode项目中生成的MACOSX_DEPLOYMENT_TARGET值正确，但iOS环境下该设置无效果，生成的IPHONEOS_DEPLOYMENT_TARGET = 11.0。根据CMake官方文档，CMAKE_OSX_DEPLOYMENT_TARGET变量应同样适用于iOS平台。

环境信息：CMake版本3.29.2，Xcode版本15.3。

编辑1 #

尝试将CMAKE_XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET设置为缓存变量和非缓存变量：

set(CMAKE_XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET "14.0" CACHE STRING "Workaround for minimum iOS deployment version")
set(CMAKE_XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET "14.0")

但以上两种设置均无效，唯一有效的解决办法是直接针对目标设置属性：

set_target_properties(${PROJECT_NAME} PROPERTIES
    XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET "14.0")

编辑2 #

尝试了答案中的代码：

if (APPLE)
    # The variable CMAKE_OSX_DEPLOYMENT_TARGET must initialized as a cache variable prior to the first project() command
    # Your code won't work the variable IOS cannot be used before the project call. It will always be false.
    # You must use the CMAKE_SYSTEM_NAME instead
    message("CMAKE_SYSTEM_NAME: ${CMAKE_SYSTEM_NAME}")
    if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
        #Does not take an effect, the workaround is setting XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET.
        set(CMAKE_OSX_DEPLOYMENT_TARGET "14.0" CACHE STRING "Minimum iOS deployment version")
    else()
        set(CMAKE_OSX_DEPLOYMENT_TARGET "11.0" CACHE STRING "Minimum MacOS deployment version")
    endif()
    message("CMAKE_OSX_DEPLOYMENT_TARGET has been set to ${CMAKE_OSX_DEPLOYMENT_TARGET}")
endif()

但得到如下输出：

重启QT Creator后运行CMake，得到正确的结果：

但删除构建文件并重新运行干净的CMake后，问题再次出现：

QT Creator中指定了以下OSX属性：

但未指定CMAKE_SYSTEM_NAME变量。

内容的提问来源于stack exchange，提问作者Alexey Starinsky