元素
鍵盤
env(keyboard-inset-height) 是軟體鍵盤在畫面表面上方的高度,鍵盤隱藏時為 0。將它用作 view 的底部 padding 或 margin,可讓內容保持在鍵盤上方:當鍵盤顯示或隱藏時,view 會依鍵盤的高度騰出空間,且這項變化會以原生方式與鍵盤同步動畫。它適用於捲動檢視之外的內容,例如聊天畫面底部的訊息列;位於捲動檢視或 List 內的輸入欄位,則會以原生方式捲動至可見範圍。與它搭配的還有用來隱藏鍵盤的 Keyboard.dismiss(),以及鍵盤高度本身,可用於您自訂的版面配置。
import { mount, Scroll, signal, Text, View } from "nsh";
import { Input } from "nsh/base";
import { Button, Switch } from "nsh/base";
import { Keyboard, keyboardFrame } from "nsh";
import { button, buttonText, desktop, field, tint, ui } from "./palette";
function App() {
const draft = signal("");
const messages = signal(["Type below: the bar stays above the keyboard."]);
const behavior = signal<"padding" | "height">("padding");
const enabled = signal(true);
const send = () => {
if (!draft().trim()) return;
messages.update((list) => [...list, draft().trim()]);
draft.set("");
};
const chip = (on: () => boolean) => button("secondary", { on, size: "sm" });
const chipText = (on: () => boolean) => buttonText("secondary", { on });
const isPadding = () => behavior() === "padding";
const isHeight = () => behavior() === "height";
return (
<View
style={{
flex: 1,
backgroundColor: behavior() === "height" ? tint(ui().info, 0.12) : ui().page,
// Bottom padding (or margin) by the keyboard's height, while enabled.
...(!enabled() ? {} : behavior() === "padding" ? { paddingBottom: "env(keyboard-inset-height)" } : { marginBottom: "env(keyboard-inset-height)" }),
}}
>
<View style={{ padding: 20, paddingTop: 24, paddingBottom: 8, gap: 8 }}>
<Text style={{ fontSize: 22, fontWeight: "700", color: ui().text }}>keyboard inset</Text>
<Text style={{ color: ui().muted }}>
{desktop
? "Desktops type with a hardware keyboard: its height stays 0 and the view keeps its layout. Open this on a phone to see it move."
: "Tap the message field: the bar moves up with the keyboard."}
</Text>
<View style={{ flexDirection: "row", flexWrap: "wrap", gap: 6 }}>
<Button onPress={() => behavior.set("padding")} selected={isPadding()} {...chip(isPadding)}>
<Text style={chipText(isPadding)}>padding</Text>
</Button>
<Button onPress={() => behavior.set("height")} selected={isHeight()} {...chip(isHeight)}>
<Text style={chipText(isHeight)}>height</Text>
</Button>
<Switch
checked={enabled()}
onChange={({ checked }) => enabled.set(checked)}
class="flex-row items-center gap-2 px-1 active:opacity-70"
trackClass="w-9 rounded-full p-0.5 transition-colors motion-reduce:transition-none"
trackStyle={enabled() ? ui().accentFill : ui().inset}
thumbClass="size-4 rounded-full transition-transform motion-reduce:transition-none checked:translate-x-4"
thumbStyle={enabled() ? { backgroundColor: ui().onAccent } : ui().raised}
>
<Text style={{ color: ui().text, fontSize: 13, fontWeight: "600" }}>enabled {String(enabled())}</Text>
</Switch>
</View>
<Text style={{ color: ui().accent, fontSize: 13 }}>
keyboardFrame(): height {Math.round(keyboardFrame().height)} · duration {Math.round(keyboardFrame().duration)} ms
</Text>
</View>
<Scroll style={{ flex: 1 }} keyboardDismissMode="interactive">
<View style={{ padding: 20, paddingTop: 4, gap: 8 }}>
<Each of={messages()}>
{(text) => (
<View style={{ ...ui().row, alignSelf: "flex-start", maxWidth: 320, borderRadius: 14, paddingHorizontal: 12, paddingVertical: 8 }}>
<Text style={{ color: ui().text }}>{text()}</Text>
</View>
)}
</Each>
</View>
</Scroll>
<View style={{ flexDirection: "row", gap: 8, padding: 12, paddingHorizontal: desktop ? 20 : 12, borderTopWidth: 1, borderTopColor: ui().border, backgroundColor: ui().page }}>
<Input
value={draft()}
onChange={({ value }) => draft.set(value)}
onSubmit={send}
testID="message"
returnKeyType="send"
placeholder="Message"
{...field({ style: { flex: 1 } })}
/>
<Button onPress={send} {...button("primary")}>
<Text style={buttonText("primary")}>Send</Text>
</Button>
<Button onPress={() => Keyboard.dismiss()} {...button()}>
<Text style={buttonText()}>Done</Text>
</Button>
</View>
</View>
);
}
mount(App);use nsh_core::prelude::*;
fn chat() -> impl IntoElement {
let draft = signal(String::new());
view()
.flex_1()
.bg(white())
.pb_keyboard()
.child(scroll().flex_1().child(text("Messages…").p_4()))
.child(
view()
.flex_row()
.gap_2()
.p_2()
.border_t_1()
.border_color(rgb(0xe5e5e5))
.child(
input()
.value(draft)
.on_change(move |v: &str| draft.set(v.to_owned()))
.placeholder("Message")
.flex_1()
.p_2(),
),
)
}import { mount, Scroll, signal, Text, View } from "nsh";
import { Input } from "nsh/base";
function App() {
const draft = signal("");
return (
<View style={{ flex: 1, backgroundColor: "#ffffff", paddingBottom: "env(keyboard-inset-height)" }}>
<Scroll style={{ flex: 1 }} keyboardDismissMode="interactive">
<Text style={{ padding: 16, paddingTop: 48 }}>Messages…</Text>
</Scroll>
<View style={{ flexDirection: "row", gap: 8, padding: 8, borderTopWidth: 1, borderTopColor: "#e5e5e5" }}>
<Input
value={draft()}
onChange={({ value }) => draft.set(value)}
placeholder="Message"
style={{ flex: 1, fontSize: 16, padding: 8 }}
/>
</View>
</View>
);
}
mount(App);完整的鍵盤高度適用於延伸至螢幕底部的 view,例如整個畫面的內容。當 view 下方還有其他元素(例如分頁列)時,請以長度值將其扣除:calc(env(keyboard-inset-height) + -49px) 會讓 view 保持在 49 pt 分頁列的上方,而 calc(env(keyboard-inset-height) + 12px) 則會在鍵盤上方加入間距。padding 最小為 0。
#Padding 或 margin
| 樣式 | 騰出空間的方式 |
|---|---|
paddingBottom: "env(keyboard-inset-height)"(Tailwind pb-[env(keyboard-inset-height)],Rust .pb_keyboard()) | 上方的內容會縮小;背景仍會延伸至螢幕底部。 |
marginBottom: "env(keyboard-inset-height)"(Tailwind mb-[env(keyboard-inset-height)],Rust .mb_keyboard()) | 整個 view(包含其背景)會在鍵盤頂端結束。 |
鍵盤的高度只會加到同一個宣告中的長度上,因此 view 若要將它與自身的間距結合,請在 calc() 中處理。在 Rust 中,可使用 .pb_keyboard_plus(px(..)) 與 .mb_keyboard_plus(px(..)) 來加上長度。
use nsh_core::prelude::*;
fn sign_in() -> impl IntoElement {
view()
.mb_keyboard_plus(px(-49.0))
.flex_1()
.p_4()
.gap_3()
.child(input().placeholder("E-mail").keyboard_type(KeyboardType::Email))
}<View class="flex-1 gap-3 p-4 mb-[calc(env(keyboard-inset-height)+-49px)]">
<Input placeholder="E-mail" keyboardType="email-address" class="rounded-lg border border-neutral-300 px-3 py-2" />
</View>在此範例中,view 下方的 49 pt 分頁列已經遮住了一部分的鍵盤高度。若要關閉騰出空間的行為,請不要在樣式中使用該變數,例如依據 signal 設定條件。
#隱藏鍵盤
來自 nsh 的 Keyboard.dismiss() 會讓目前取得焦點的輸入欄位失去焦點,進而隱藏鍵盤。若沒有任何輸入欄位取得焦點,則不會有任何變動。Rust 元件則呼叫 dismiss_keyboard()。
use nsh_base::button;
use nsh_core::prelude::*;
fn done() -> impl IntoElement {
button()
.on_press(|| dismiss_keyboard())
.rounded_lg()
.bg(rgb(0x2563eb))
.px_4()
.py_3()
.child(text("Done").text_color(white()))
}import { Text, Keyboard } from "nsh";
import { Button } from "nsh/base";
function Done() {
return (
<Button onPress={() => Keyboard.dismiss()} class="rounded-lg bg-blue-600 px-4 py-3 active:bg-blue-700">
<Text class="text-center font-semibold text-white">Done</Text>
</Button>
);
}#鍵盤的高度
| TSX | Rust | 傳回值 |
|---|---|---|
keyboardFrame() | keyboard_height()、keyboard_duration() | 軟體鍵盤在 NSH 畫面表面上方的高度(以點為單位,隱藏時為 0),以及其顯示或隱藏動畫的持續時間(以毫秒為單位)。 |
兩者皆為響應式:當鍵盤顯示、隱藏或高度改變時,讀取它們的 effect、JSX 運算式或樣式 closure 都會重新執行。
use nsh_core::prelude::*;
fn message_bar() -> impl IntoElement {
view()
.flex_row()
.p_2()
.pb(move || {
// The home indicator's inset only matters while the keyboard is hidden.
let home = if keyboard_height() > Points::ZERO {
Points::ZERO
} else {
safe_area().bottom
};
px(8.0) + home
})
.child(input().placeholder("Message").flex_1())
}import { View, keyboardFrame, safeArea } from "nsh";
import { Input } from "nsh/base";
function MessageBar() {
const insets = safeArea();
return (
<View
style={{
flexDirection: "row",
padding: 8,
// The home indicator's inset only matters while the keyboard is hidden.
paddingBottom: 8 + (keyboardFrame().height > 0 ? 0 : insets().bottom),
}}
>
<Input placeholder="Message" style={{ flex: 1 }} />
</View>
);
}此高度是指鍵盤與 NSH 畫面表面重疊的部分。當視窗本身因鍵盤而縮小(例如會調整大小的 Android activity),或 NSH 嵌入在終止於鍵盤上方的 view 中時,高度為 0。
#平台說明
- iOS:騰出的空間會以鍵盤本身的持續時間與 ease-in-ease-out 曲線進行動畫。
- Android:當視窗因鍵盤而縮小(會調整大小的 activity)時,內容本來就會在鍵盤上方結束,此變數為 0。當鍵盤覆蓋在 view 上方時,其騰出空間的方式與 iOS 相同。
- 桌面平台與 Mac Catalyst 使用實體鍵盤輸入:此變數為 0,view 會維持原有的版面配置。
- Web:此變數為瀏覽器本身提供的變數(即 VirtualKeyboard API 的變數)。