用于抑制可空性警告的 Xcode 编译标志不起作用？
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Xcode Compile Flag to Suppress Nullability Warnings not Working?
提问by electronix384128
For a limited time I want to suppress these kind of warnings the compiler is showing me in Xcode 7.3.1:
在有限的时间内，我想抑制编译器在 Xcode 7.3.1 中向我显示的此类警告：
<File>: Pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified)
<File>: Pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified)
I have added this compiler flag to all classes under My Target/Build Phases/Compile Sources:
-Wnullability-completeness
我已将此编译器标志添加到我的目标/构建阶段/编译源下的所有类：
-Wnullability-completeness
But it's not working - the warnings are still shown. How can I get rid of the warnings?
但它不起作用 - 仍然显示警告。我怎样才能摆脱警告？
回答by Carl Norum
To disablethose warnings, you want: -Wno-nullability-completeness. Note the no-; the flag you're using enablesthose warnings.
要禁用这些警告，你想要的：-Wno-nullability-completeness。注意no-; 您使用的标志启用了这些警告。
回答by RunLoop
Note that in Xcode 11 it is now -Wno-nonnull
请注意，在 Xcode 11 中，它现在是 -Wno-nonnull
It should be set in "Other Warning Flags" in the "Apple Clang - Custom Compiler Flags" section of your target.
它应该在目标的“Apple Clang - 自定义编译器标志”部分的“其他警告标志”中设置。
You could also avoid these warnings and setting the above altogether by removing these flags Xcode automatically adds to new header files in Objective-C:
您还可以通过删除 Xcode 自动添加到 Objective-C 中的新头文件的这些标志来避免这些警告并完全设置上述内容：
NS_ASSUME_NONNULL_BEGIN
NS_ASSUME_NONNULL_END
回答by Steven Kramer
In Xcode 11.3, these started appearing out of nowhere in my pure Swift project on the Github ci. That was because I am importing the AWS Objective-C SDK.
在 Xcode 11.3 中，这些开始出现在我在 Github ci 上的纯 Swift 项目中。那是因为我要导入 AWS Objective-C SDK。
Confoundingly, this would only occur on the first build, probably creating the module map for the framework. Hence it was only a problem on ci because of the clean builds.
令人困惑的是，这只会发生在第一次构建时，可能会为框架创建模块映射。因此，由于干净的构建，这只是 ci 上的一个问题。
Fixed it by adding this to the Swiftcompiler options (search for OTHER_SWIFT_FLAGSin your build settings):
通过将其添加到Swift编译器选项来修复它（OTHER_SWIFT_FLAGS在您的构建设置中搜索）：
-Xcc -Wno-nullability-completeness
回答by Vlad
Settings for Xcode 11.5 when using project with mixed sources, ObjC and Swift:
使用带有混合源、ObjC 和 Swift 的项目时，Xcode 11.5 的设置：
WARNING_CFLAGS = $(inherited) -Wno-nullability-completeness
OTHER_SWIFT_FLAGS = $(inherited) -Xcc -Wno-nullability-completeness
