检测键盘是否有 macOS 上的 Globe 键

Question

最近的 Apple 产品的键盘上有 Globe (\xef\xb8\x8e) 键。在 AppKit 级别，它实际上只是一个 Fn 键，其行为与NSEvent.ModifierFlags.function. 但是有什么方法可以知道用户当前使用的键盘是有 Globe 键还是只有 Fn 键呢？

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似乎系统以某种方式知道它，因为菜单中的快捷键显示根据键盘而变化。仅当键盘实际有 Globe 键时才会显示 Globe 符号。否则，显示“fn”。

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但是，到目前为止，我还没有找到一种在 AppKit/SwiftUI 世界中以编程方式检测它的方法。我想在我自己的视图中实现显示这些菜单命令的键盘快捷键。

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Answer 1

I /O 注册表似乎包含有关 Globe 键是否存在\xe3\x80\x80（"SupportsGlobeKey" = Yes或No）的信息。

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在我的环境（MacBook Pro 2023）中，ioreg -rln AppleHIDKeyboardEventDriverV2给出以下结果。\n（我没有台式机，因此无法验证是否存在 Globe 键）。

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$ ioreg -rln AppleHIDKeyboardEventDriverV2\n+-o AppleHIDKeyboardEventDriverV2  <class AppleHIDKeyboardEventDriverV2, id 0x100000ba5, registered, matched, active, busy 0 (0 ms), retain 10>\n  | {\n  |   "LocationID" = 49\n  |   "IOPersonalityPublisher" = "com.apple.driver.AppleTopCaseDriverV2"\n  |   "Keyboard" = {"Elements"=({"VariableSize"=0,"UnitExponent"=0,"IsRelative"=No,"UsagePage"=7,"Max"=1,"IsArray"=No,"Type"=2,"Size"=1,"Min"=0,"Flags"=134217730,"ReportID"=1,"Usage"=224,"ReportCount"=1,"Unit"=0,"Ha$\n  |   "IOMatchCategory" = "IODefaultMatchCategory"\n  |   "CapsLockLanguageSwitch" = No\n  |   "HIDServiceSupport" = Yes\n*snip*\n  |   "KeyboardEnabled" = Yes\n  |   "PrimaryUsagePage" = 1\n  |   "CFBundleIdentifierKernel" = "com.apple.driver.AppleHIDKeyboard"\n  |   "SupportsGlobeKey" = Yes\n  |   "SensorProperties" = {}\n  |   "ProductID" = 0\n*snip*\n

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要以编程方式获取 I/O 注册表信息，请使用IOKit.

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例如，要获取地球键是否存在，请使用以下代码。

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$ ioreg -rln AppleHIDKeyboardEventDriverV2\n+-o AppleHIDKeyboardEventDriverV2  <class AppleHIDKeyboardEventDriverV2, id 0x100000ba5, registered, matched, active, busy 0 (0 ms), retain 10>\n  | {\n  |   "LocationID" = 49\n  |   "IOPersonalityPublisher" = "com.apple.driver.AppleTopCaseDriverV2"\n  |   "Keyboard" = {"Elements"=({"VariableSize"=0,"UnitExponent"=0,"IsRelative"=No,"UsagePage"=7,"Max"=1,"IsArray"=No,"Type"=2,"Size"=1,"Min"=0,"Flags"=134217730,"ReportID"=1,"Usage"=224,"ReportCount"=1,"Unit"=0,"Ha$\n  |   "IOMatchCategory" = "IODefaultMatchCategory"\n  |   "CapsLockLanguageSwitch" = No\n  |   "HIDServiceSupport" = Yes\n*snip*\n  |   "KeyboardEnabled" = Yes\n  |   "PrimaryUsagePage" = 1\n  |   "CFBundleIdentifierKernel" = "com.apple.driver.AppleHIDKeyboard"\n  |   "SupportsGlobeKey" = Yes\n  |   "SensorProperties" = {}\n  |   "ProductID" = 0\n*snip*\n

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