SecureField

用于密码输入的 SwiftUI SecureField 组件。

iOS

tvOS

Included in Expo Go

GitHub

npm

更新日志

Recommended version:

~57.0.0

Expo UI SecureField 与官方 SwiftUI SecureField API 保持一致，并提供一个可屏蔽用户输入内容的文本字段，适用于密码和其他敏感文本。

安装

Terminal

- npx expo install @expo/ui

If you are installing this in an existing React Native app, make sure to install expo in your project.

用法

基础安全字段

BasicSecureFieldExample.tsx

import { useState } from 'react';
import { Host, SecureField } from '@expo/ui/swift-ui';

export default function BasicSecureFieldExample() {
  const [password, setPassword] = useState('');

  return (
    <Host matchContents>
      <SecureField placeholder="密码" onTextChange={setPassword} />
    </Host>
  );
}

提交处理

使用 submitLabel 和 onSubmit 修饰器来处理从键盘发起的表单提交。

SecureFieldSubmitExample.tsx

import { useState } from 'react';
import { Host, SecureField } from '@expo/ui/swift-ui';
import { submitLabel, onSubmit } from '@expo/ui/swift-ui/modifiers';

export default function SecureFieldSubmitExample() {
  const [password, setPassword] = useState('');

  return (
    <Host matchContents>
      <SecureField
        placeholder="密码"
        onTextChange={setPassword}
        modifiers={[submitLabel('done'), onSubmit(() => console.log('Login submitted'))]}
      />
    </Host>
  );
}

命令式 ref

使用 ref 以命令式方式设置安全字段的文本、聚焦或失焦。

ImperativeSecureFieldExample.tsx

import { useRef } from 'react';
import { Host, SecureField, SecureFieldRef, Button, HStack, VStack } from '@expo/ui/swift-ui';
import { buttonStyle } from '@expo/ui/swift-ui/modifiers';

export default function ImperativeSecureFieldExample() {
  const ref = useRef<SecureFieldRef>(null);

  return (
    <Host matchContents>
      <VStack>
        <SecureField ref={ref} placeholder="密码" />
        <HStack spacing={12}>
          <Button
            modifiers={[buttonStyle('bordered')]}
            onPress={() => ref.current?.focus()}
            label="聚焦"
          />
          <Button
            modifiers={[buttonStyle('bordered')]}
            onPress={() => ref.current?.blur()}
            label="失焦"
          />
          <Button
            modifiers={[buttonStyle('bordered')]}
            onPress={() => ref.current?.setText('secret123')}
            label="Set text"
          />
        </HStack>
      </VStack>
    </Host>
  );
}

API

import { SecureField } from '@expo/ui/swift-ui';

Component

`SecureField`

Type: React.Element<SecureFieldProps>

Renders a SwiftUI SecureField for password input.

SecureFieldProps

`autoFocus`

Optional • Type: boolean • Default: false

If true, the secure field will be focused automatically when mounted.

`children`

Optional • Type: ReactNode

Slot children - supports <SecureField.Placeholder> with a <Text> child

`maxLength`

Optional • Type: number

Maximum number of characters allowed. Truncates natively as the user types.

`onFocusChange`

Optional • Type: (focused: boolean) => void

A callback triggered when the field gains or loses focus.

`onTextChange`

Optional • Type: (text: string) => void

A callback triggered when the text value changes.

If the callback is marked with the 'worklet' directive, it runs synchronously on the UI thread; otherwise it is delivered asynchronously as a regular JS event.

`placeholder`

Optional • Type: string

A text that is displayed when the field is empty.

`ref`

Optional • Type: Ref<SecureFieldRef>

`text`

Optional • Type: ObservableState<string>

An observable state that holds the current text. Create one with useNativeState('') or useNativeState('initial value'). If omitted, the field manages its own internal state.

Inherited props

CommonViewModifierProps

Types

`SecureFieldRef`

Can be used for imperatively setting text and focus on the SecureField component.

Property	Type	Description
blur	`() => Promise<void>`	-
clear	`() => Promise<void>`	Clear the current text.
focus	`() => Promise<void>`	-
setText	`(newText: string) => Promise<void>`	-