macos - 导出的 UTI 未被 macOS 拾取

Question

我尝试在应用程序中导出 UTI，但 macOS (10.3.2) 未拾取它。我已经在一个较小的项目中复制了我的问题。这是 info.plist 的相关部分:

<key>UTExportedTypeDeclarations</key>
<array>
    <dict>
        <key>UTTypeConformsTo</key>
        <array>
            <string>public.plain-text</string>
        </array>
        <key>UTTypeDescription</key>
        <string>Demo of custom file support</string>
        <key>UTTypeIconFile</key>
        <string>File-512</string>
        <key>UTTypeIdentifier</key>
        <string>am.customfiledemo.demotxt</string>
        <key>UTTypeTagSpecification</key>
        <dict>
            <key>public.filename-extension</key>
            <array>
                <string>demotxt</string>
            </array>
            <array/>
        </dict>
    </dict>
</array>

我尝试重新启动，甚至重建启动服务数据库，但没有效果:

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain ststem -domain user -v

当我检查文件的 UTI 时

mdls -name kMDItemContentType -name kMDItemContentTypeTree file.demotxt

我得到的是动态 (dyn.*) UTI，而不是 am.customfiledemo.demotxt

kMDItemContentType                 = "dyn.ah62d4rv4ge80k3prr74hu7a"
kMDItemContentTypeTree             = (
    "dyn.ah62d4rv4ge80k3prr74hu7a",
    "public.data",
    "public.item"
)

Answer 1

使 UTI 符合 public.data 或 com.apple.package:

Although a custom UTI can conform to any UTI, public.data or com.apple.package must be at the root of the conformance hierarchy for all custom UTIs that are file formats (such as documents); otherwise, the system can’t tell if an item on disk has that UTI.

-Uniform Type Identifiers Overview, Declaring New Uniform Type Identifiers, Recommendations for Declaring new Uniform Type Identifiers