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[iOS] Focused TextInput keeps focus and keyboard after switching pages (v9)

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@TaduJR がすでに取り組んでいます。

2026年10月19日 から。

  • #1193 @TaduJR による — オープン

評価

難易度
4/5
見積もり時間
1〜2日
初心者へのやさしさ
69/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
活発
技術スタック
ios, react-native, swift, typescript
領域
frontend, mobile

調査の方向性

Start at the iOS PagerViewProvider path that forwards onPageSelected and inspect how it handles focus when the selected page changes. Compare with the Android fix in #1155, which clears focus outside the selected page and hides the keyboard. Reproduce with the provided two-page TextInput example using setPage and a swipe; done when leaving a page blurs its input and the keyboard follows.

索引モデルが issue の本文から書いたものです。

説明

Environment

  • react-native-pager-view: 9.0.9 (also present in 9.0.8)
  • React Native: 0.88, New Architecture
  • Xcode 27, iOS 27.0 simulator (iPhone 18 Pro)
  • iOS only. The Android half of this was fixed in #1155 and shipped in 9.0.8.

Description

This is the iOS half of #1154, which was fixed for Android only.

A TextInput that's focused on one page stays focused after you switch to another page, whether with setPage or a swipe. The keyboard stays open, nothing on the page you land on is focused, and typing still goes into the input that's now off-screen, so the user edits a field they can't see.

The iOS implementation never touches focus. PagerViewProvider forwards onPageSelected and leaves the first responder alone, and SwiftUI's paged TabView keeps the neighbouring pages in the view hierarchy, so the input that was left behind holds the first responder and the keyboard with it.

keyboardDismissMode doesn't cover this. It defaults to none, and even on-drag only reacts to a drag, so setPage never dismisses. Dismissing the keyboard is also not the same as blurring, which is what leaves keystrokes going into the off-screen field.

Android behaved the same way until #1155, which clears focus held outside the selected page when a page is selected, and hides the keyboard explicitly. The two platforms disagree today: the same code blurs on Android 9.0.8 and keeps focus on iOS.

Expected: leaving a page blurs an input focused on it and the keyboard follows, as it now does on Android.
Actual: the input keeps focus, the keyboard stays open, and keystrokes go to the off-screen page.

Here is the moment it goes wrong, with a status line showing the selected page, the focused input and the keyboard: the pager is on page 0, while page 1's input still holds focus and the keyboard.

Image

Found in Expensify/App#101157, where a pager hosts a form on each tab.

Reproducible Demo

import { useRef } from 'react';
import { Button, StyleSheet, TextInput, View } from 'react-native';
import PagerView from 'react-native-pager-view';

export function Repro() {
  const ref = useRef<PagerView>(null);

  return (
    <PagerView ref={ref} style={StyleSheet.absoluteFill} initialPage={0}>
      {[0, 1].map((page) => (
        <View key={page} style={{ flex: 1, padding: 24, gap: 12 }}>
          <TextInput placeholder={`Input ${page}`} style={{ borderWidth: 1, padding: 12 }} />
          <Button title={`Go to page ${1 - page}`} onPress={() => ref.current?.setPage(1 - page)} />
        </View>
      ))}
    </PagerView>
  );
}
  1. Focus Input 1 on page 1 and wait for the keyboard.
  2. Tap Go to page 0, or swipe back to page 0.
  3. Type.

The keyboard never closes, and the characters land in Input 1 while page 0 is on screen. Swipe back and you'll find the text in the input you couldn't see.

主要言語
TypeScript
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