我正在尝试在可可中显示MenuItem的多个组合键。这是最常见的“和弦”。
例如，我想添加一个菜单项，如下所示： “ Action1控件K，F”或“ MenuItem2 K，L”
在Objective-C中通过标准API可以做到吗？我环顾四周，在MacOS上最接近此功能的地方是使用自定义视图。允许使用此功能的方法是否可行？
答案 0 :(得分：1)
标准API不支持处理和弦，因此不允许将和弦设置为等价键，因此也无法将和弦显示为等价键。
如果您需要该功能，则需要完全自己实施。只需创建您自己的NSView对象并将其分配给<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 532.46 217.12">
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<script>
</script>的{{1}}属性即可。如记录所示，您将必须自己绘制所有内容：
带有视图的菜单项不会绘制其标题，状态，字体或其他 标准图纸属性，并完全分配图纸责任 到视图。等效的键盘和类型选择继续使用键 等价和标题正常。
来源：https://developer.apple.com/documentation/appkit/nsmenuitem/1514835-view?language=objc
这是不是普通的view充满子视图，是通过程序创建的还是甚至是从NIB文件加载的子视图，还是这是NSMenuItem的子类，绘制一切本身取决于您，所有这些变体将真正起作用。通常，最简单的方法是使用NIB文件并在界面生成器中使用自动布局来构建菜单外观。
请记住，这违反了Apple人机界面指南。它违反了用户的期望，因为他的所有其他应用都没有提供任何可比的功能，因为在macOS中，菜单项具有一个键等效项或没有键等效项。这也破坏了用户自定义键等效功能的能力，就像他在所有其他应用程序（系统偏好设置>键盘>快捷方式>应用程序快捷方式）中所做的那样。
通常，除非您确实有充分的理由这么做，否则不应该用自己的UI替换系统标准UI，因为这总是会破坏用户的期望，某些系统功能将无法按预期运行（例如，可访问性功能），并且破坏系统的统一外观。如MacOS 10.14（Mojave）所示，它会破坏系统自动运行，其中所有系统标准UI均自动支持暗模式，因此，如果仅使用标准UI，则您的应用无需任何修改即可支持暗模式，但所有自定义UI都需要再次针对黑暗模式进行了自定义。
答案 1 :(得分：0)
是的，您需要使用自定义视图。 NSMenuItem仅显示其keyEquivalent的第一个字符。