Add support for the fn shortcut key

[Poiol000]

If we can use the fn shortcut key(🌏 the earth icon in keyboard) to switch input methods on a mac, it won't take up the space of other shortcut keys and we can press it more quickly

[runjuu]

Isn't it already able to switch input sources using the fn shortcut? 🤔

[jiake0312]

虽说mac系统设置有通过fn按键切换输入法，但多语言输入者通常会安装【两个以上】的输入法（比如英中日），而大部分场景下只会用到两个(中日)，所以希望可以做到【关闭自带的fn切换→使用贵软件设置fn按键切换】

[Xicrosoft]

Hi @jiake0312, thank you for your feedback!

You’re absolutely right — macOS's default "Press Key to Change Input Source" feature isn't ideal for multilingual users, especially when only two are frequently used.

To better suit this use case, I recommend enabling another built-in feature called "Use the Caps Lock key to switch to and from last used Latin input source".

Here’s how to enable it:

1. Go to System Settings → Keyboard → Text Input → Input Sources → Edit → All Input Sources
   Alternatively, just search for "Use Caps Lock to switch input sources" directly in System Settings.
2. Then enable "Use the Caps Lock key to switch to and from last used Latin input source"¹ option.
3. If you still want to type in uppercase, simply press and hold the Caps Lock key until the green indicator light (if available) turns on.

While this doesn’t give you full control over the key, it’s a helpful native workaround for simplifying your input method switching.

Feel free to share more ideas with us anytime!

---

此回复的中文翻译

Hi @jiake0312，感谢您的反馈！

确实，macOS 自带的 “按下 时更改输入法”功能对于多语言用户来说并不理想，尤其是在你只需要频繁使用两种输入法的情况下。

针对这种使用场景，我建议你启用另一个内建功能：“使用大写锁定键切换上次所用的拉丁输入法”。
启用方法如下：

1. 打开系统设置 → 键盘 → 文本输入 → 输入法 → 编辑 → 所有输入法
   或者，直接在系统设置中搜索 “使用大写锁定键切换输入法”。
2. 然后启用 “使用大写锁定键切换上次所用的拉丁输入法”² 选项。
3. 如果你仍希望使用大写功能，只需按住 Caps Lock 键，直到绿色指示灯（如设备配有）亮起即可。

虽然这无法完全自定义 键的行为，但它是 macOS 提供的一个实用的原生替代方案，有助于简化输入法切换过程。

欢迎随时继续向我们分享你的想法！

Footnotes

1. The option’s description may vary depending on your keyboard layout. ↩

2. 选项的描述可能因您的键盘布局而异。 ↩

[Xicrosoft]

Hi @jiake0312,

Sorry for the confusion — it seems I misunderstood your request earlier in #11 (reply in thread).

The “Use the Caps Lock key to switch to and from last used Latin input source” feature is unfortunately only designed to switch between Latin and non-Latin input sources. It doesn't support switching between two non-Latin input sources, such as Chinese and Japanese.

At the moment, our app does not support that feature. However, I understand this could be a helpful feature, and we may consider supporting it in the future.

If possible, I’d appreciate it if you could open a new issue and reference this discussion. That way, we can better track the request.

Thank you again for your understanding and valuable feedback!

---

此回复的中文翻译

Hi @jiake0312，

抱歉造成混淆——看来我之前在 #11 (reply in thread) 中误解了你的请求。

“使用大写锁定键切换上次所用的拉丁输入法” 功能仅支持用于在拉丁和非拉丁输入源之间切换。它不支持在两个非拉丁输入源（如中文和日文）之间切换。

目前，我们的应用程序不支持此功能。然而，我理解这可能是一个有用的功能，我们可能会在未来考虑支持它。

如果可能的话，我希望您能打开一个新 issue 并引用此讨论。这样，我们可以更好地跟踪此请求。

再次感谢您的理解和宝贵建议！