Xcode：如何为被Metal引用的.h文件设置Metal/C++语法高亮？

If you're stuck with basic syntax highlighting for your .h headers included in .metal files, here are a few straightforward ways to fix this in Xcode 9:

Per-File Permanent Fix #

This is the simplest and most reliable method for individual files:

• Select your .h file in the Project Navigator (left sidebar).
• Open the File Inspector (right sidebar—click the blue document icon if it’s hidden).
• Scroll down to the Identity and Type section.
• Click the dropdown next to Type (it’ll likely show "Header File" by default).
• Search for and pick either Metal Source or C++ Source. Since Metal’s syntax builds on C++, both options will give you proper highlighting. Go with Metal Source if your header uses Metal-specific keywords like device or threadgroup for the most accurate results.

Temporary Session Fix #

If you don’t want to change the file’s type permanently but need better highlighting for your current work:

• Open the .h file in the editor.
• Head to the menu bar: Editor > Syntax Coloring
• Choose Metal or C++ from the list. This applies the highlighting immediately but won’t stick when you close and reopen the file.

Project-Wide Workaround #

For multiple such headers, the per-file method is still the safest bet (modifying Xcode’s default settings can cause issues with updates). But if you want to streamline things, you could:

• Create a custom file template for Metal headers (though this requires a bit more setup in Xcode’s template directories).
• Or, use a script to bulk-update the file types, but be cautious—this could accidentally affect other headers in your project.

Overall, the per-file type change is the best balance of simplicity and reliability for most cases.

内容的提问来源于stack exchange，提问作者Endre