(callback, delay)
| 2 | import { Text } from 'react-native' |
| 3 | |
| 4 | function useInterval(callback, delay) { |
| 5 | const savedCallback = useRef() |
| 6 | |
| 7 | // Remember the latest callback. |
| 8 | useEffect(() => { |
| 9 | savedCallback.current = callback |
| 10 | }, [callback]) |
| 11 | |
| 12 | // Set up the interval. |
| 13 | useEffect(() => { |
| 14 | if (delay !== null) { |
| 15 | let id = setInterval(() => { |
| 16 | savedCallback.current() |
| 17 | }, delay) |
| 18 | return () => clearInterval(id) |
| 19 | } |
| 20 | }, [delay]) |
| 21 | } |
| 22 | |
| 23 | export default function App() { |
| 24 | const [count, setCount] = useState(0) |