te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>reactjs - Why is my React Native screen re-rendering extra times after resetting Redux state? - Stack Overflow
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reactjs - Why is my React Native screen re-rendering extra times after resetting Redux state? - Stack Overflow

programmeradmin3浏览0评论

I have a Matches screen in my React Native app that re-renders one extra time every time I reset the matches state from another screen (e.g., Preferences).

Problem Behavior:

  • Initially, the screen renders once.

  • If I navigate to Preferences, reset matches, and come back, it renders one extra time (i.e., 2 times).

  • If I repeat this, the renders keep increasing:

    • 1st reset → 2 renders
    • 2nd reset → 3 renders
    • 3rd reset → 4 renders, and so on...

What I Have Tried:

  1. Ensured matches state resets properly in Redux.
  2. Commented second useFocusEffect and checked (rendering is constant only 2 times )
  3. Commenting dispatch(loadMatches()); makes the rendering constant (only 2 times )

Question:

  1. Why does the render count increase every time I reset the state and return to the screen?
  2. How can I prevent this unnecessary extra re-render?

Would love to hear your insights. Thanks in advance!

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