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iOS: UI will be blocked when show Alert while closing Modal #10471

Description

@nihgwu

When show Alert while closing Modal, the Alert dialog will disappear and the Modal will block the UI entirely even after reload, only on iOS.

'use strict';

import React, { Component } from 'react';

import {
  StyleSheet,
  View,
  Text,
  Modal,
  Alert,
} from 'react-native';

class demo extends Component {
  state = {
    showModal: false,
  }

  onShowModal = () => {
    this.setState({ showModal: true });
  }
  onCloseModal1 = () => {
    this.setState({ showModal: false }, () => {
      Alert.alert('Alert', 'UI will be blocked by the modal');
    });
  }
  onCloseModal2 = () => {
    this.setState({ showModal: false }, () => {
      setTimeout(() => {
        Alert.alert('Alert', 'Alert won\'t show');
      }, 200);
    });
  }
  onCloseModal3 = () => {
    this.setState({ showModal: false }, () => {
      setTimeout(() => {
        Alert.alert('Alert', 'Works fine');
      }, 510);
    });
  }
  render() {
    const { showModal } = this.state;
    return (
      <View style={styles.container}>
        <Text onPress={this.onShowModal}>Show modal</Text>
        <Modal animationType='slide' visible={showModal} onRequestClose={this.onCloseModal3} >
          <View style={styles.container}>
            <Text onPress={this.onCloseModal1}>Close modal immediately</Text>
            <Text onPress={this.onCloseModal2}>Close modal after 200ms</Text>
            <Text onPress={this.onCloseModal3}>Close modal after more then 500ms</Text>
          </View>
        </Modal>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'space-around',
  },
});


export default demo;

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