---
title: "Switch 组件 — zenit Zig UI"
description: "用于立即生效的开关型布尔设置。明确区分 off、on、disabled，并提供成套键盘与无障碍语义。"
url: https://zenit.z.express/zh/components/switch
language: zh-CN
alternate_en: https://zenit.z.express/components/switch.md
alternate_es: https://zenit.z.express/es/components/switch.md
alternate_ja: https://zenit.z.express/ja/components/switch.md
alternate_ko: https://zenit.z.express/ko/components/switch.md
alternate_fr: https://zenit.z.express/fr/components/switch.md
alternate_de: https://zenit.z.express/de/components/switch.md
project: zenit v0.1.0-alpha (Zig 0.15.2, macOS)
source: https://github.com/version-next/zenit
---

# Switch

`ui.widgets.Switch`

用于立即生效的开关型布尔设置。

[Video](https://zenit.z.express/media/stories/switch.mp4?v=a8b343bbfb)

**BEHAVIOR CONTRACT**

明确区分 off、on、disabled，并提供成套键盘与无障碍语义。

**RECORDED INTERACTION**

Harness 点击 Off 开关，轨道与状态文本一起切换。

`examples/storybook/stories.zig:392`

```zig
pub fn buildSwitch(scope: *ui.Scope, cx: *ui.Cx) anyerror!*ui.Node {
    const a = cx.allocator;
    const c = try col(cx, 12);

    const status = try ui.text(cx, "toggled → (none)", .{ .font_size = 13, .color = light.color.fg_secondary });
    status.meta.ownership.meta.test_id = "story.switch.status";
    try c.appendChild(a, status);
    const story = try cx.bindState(SwitchStory, .{ .status = status });

    const off_switch = try W.Switch(.{
        .label_text = "Off",
        .initial_checked = false,
        .on_change = ui.Cx.boolHandlerFrom(SwitchStory, story, SwitchStory.onChange),
    }).mount(scope, cx);
    off_switch.meta.ownership.meta.test_id = "story.switch.off";
    try c.appendChild(a, off_switch);
    try c.appendChild(a, try W.Switch(.{ .label_text = "On", .initial_checked = true }).mount(scope, cx));
    try c.appendChild(a, try W.Switch(.{ .label_text = "Disabled", .disabled = true }).mount(scope, cx));
    return c;
}
```

[在 GitHub 查看源码examples/storybook/stories.zig:392](https://github.com/version-next/zenit/blob/HEAD/examples/storybook/stories.zig#L392)

这是 Storybook 中该 story 的原样代码（zenit 5f9add5+wip 2026-09-30）。其中 `W` 即 `ui.widgets`，`col` / `row` / `label` 是 Storybook 内的布局小工具。

### SwitchProps

`ui.widgets.Switch`

[src/ui/components/checkbox/mod.zig:679](https://github.com/version-next/zenit/blob/HEAD/src/ui/components/checkbox/mod.zig#L679)

```zig
fn Switch(props: SwitchProps) SwitchBuilder
```

| 字段 | 类型 | 默认值 | 说明 |
| --- | --- | --- | --- |
| `initial_checked` | `bool` | `false` | 初始开关态。\*\*只在 mount 时读取一次\*\*（语义同 CheckboxProps.initial\_checked）。 |
| `label_text` | `?[]const u8` | `null` | — |
| `disabled` | `bool` | `false` | — |
| `on_change` | `?core.HandlerRef` | `null` | — |
| `state_id` | `?u64` | `null` | — |

### \*Node

`ui.widgets.Switch`

mount 直接返回 `*Node`，把它 append 到父节点即可。