Display Loading dialog in ReactNative

Loading dialog in ReactNative

Using a loading dialog or spinner in a mobile application is essential in situations where your app is performing time-consuming tasks such as:

1. Network Requests:

• When making API calls or fetching data from a server.
• During image or file uploads.
• Retrieving large sets of data.

2. Data Processing:

• Calculating and processing data that takes a significant amount of time.
• Parsing and transforming large datasets

3. Authentication and Authorization :

• Verifying user credentials against a server.
• Checking and validating user permissions.

4. Application Initialization:

• Loading initial app data and resources.
• Setting up the app environment.

5. Resource Loading:

• Loading images, fonts, or other assets.

6. Transitions Between Screens :

• When navigating between screens, especially if there’s a delay in loading the content.

In these scenarios, displaying a loading indicator informs the user that the app is actively working on a task and helps manage user expectations. Users generally appreciate knowing that something is happening in the background, rather than experiencing a seemingly unresponsive app.

Let’s start with an example:

We will use ActivityIndicator for ReactNative.

import React, { useState, useEffect } from 'react';
import { View, Text, ActivityIndicator, StyleSheet } from 'react-native';

const MyLoadingComponent = () => {
  const [loading, setLoading] = useState(true);

  // Simulate a delay to showcase loading state
  useEffect(() => {
    const timeout = setTimeout(() => {
      setLoading(false);
    }, 5000); // Simulating a 3-second delay
    return () => clearTimeout(timeout);
  }, []);

  return (
    <View style={styles.container}>
      {loading ? (
        <View style={styles.loadingContainer}>
          <ActivityIndicator size="large" color="#007AFF" />
          <Text style={styles.loadingText}>Loading...</Text>
        </View>
      ) : (
        <View>
          {/* Your content when loading is complete */}
          <Text>Data Loaded Successfully!</Text>
        </View>
      )}
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  loadingContainer: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  loadingText: {
    marginTop: 10,
    fontSize: 16,
    color: '#333',
  },
});

export default MyLoadingComponent;

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