React-Native has reached the maximum update depth, please check the new state

When I try to add and change the number (setNum(number+1)), I encounter an error message stating: Maximum update depth exceeded. This issue may arise when a component repetitively calls setState inside componentWillUpdate or componentDidUpdate. React enforces limits on nested updates to prevent infinite loops. How can I resolve this problem?

const App = ()=>{
  const [text,setText] = useState('');
  const [todo,setToDo] = useState([]);
  const [number,setNum] = useState(0);
  const renderToDoCard = ({item})=>{
    setNum(number+1)
    return(
    <TouchableHighlight
      onLongPress={() => handleLongPress(item)}>
      <ToDoCard todo={item} number={number}/>
    </TouchableHighlight>
  )
  }
  const handleLongPress = item => {
    setToDo(todo.filter(i => i !== item));
    return Alert.alert('Deleted');
  };
  return(
    <SafeAreaView style={styles.container}>
      <StatusBar backgroundColor='#102027'/>
      <View style={styles.head_container}>
        <Text style={styles.title}>To-Do List</Text>
        <Text style={styles.title}>{todo.length}</Text>
      </View>
      <View style={styles.body_container}>
        <FlatList data={todo} renderItem={renderToDoCard} />
      </View>
      <View style={styles.bottom_container}>
        <ToDoInput todo={todo} setToDo={setToDo} text={text} setText={setText}/>
      </View>
    </SafeAreaView>
  )
}

Answer №1

There appears to be an infinite update loop in your code.

The issue lies in how you are updating the number state within the renderToDoCard function.

const renderToDoCard = ({item}) => {
  setNum(number + 1); // The problem resides here, please remove this line
  return (
    <TouchableHighlight onLongPress={() => handleLongPress(item)}>
      <ToDoCard todo={item} number={number} />
    </TouchableHighlight>
  );
};

Each time renderToDoCard is called, it triggers a state update in the App component, causing a re-render of App, which then renders renderToDoCard again, leading to an endless cycle.

This recursive process continues until it hits the maximum update depth.

To resolve this issue, simply eliminate the line setNum(number + 1);.

Based on your code, it seems like the sole purpose of the number state is to keep track of the current item index for passing it to the ToDoCard component. Instead, you can utilize the index provided by FlatList's renderItem function and pass that as the number prop of ToDoCard.

renderItem({ item, index, separators });

https://reactnative.dev/docs/flatlist#required-renderitem

You could modify your code as follows:

const renderToDoCard = ({item, index}) => {
  return (
    <TouchableHighlight onLongPress={() => handleLongPress(item)}>
      <ToDoCard todo={item} number={index} />
    </TouchableHighlight>
  );
};

Alternatively, you can assign a unique key to each item in todo and use that instead of the index.

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