DEV Community: RezaAbaskhanian

hooks for handling fetch data and use react query

RezaAbaskhanian — Sun, 23 Apr 2023 13:54:32 +0000

In this example, we've imported the useFetchData hook and called it with the API endpoint URL. The useFetchData hook returns the same object that the useQuery hook returns, so we can use the same conditional rendering logic to handle loading and error states.

Using custom hooks like this can make your code more modular and reusable, and it can also make it easier to switch between different data fetching libraries (such as switching from React Query to another library) in the future if necessary.

import { useQuery } from 'react-query';

function useFetchData(url) {
  return useQuery(['data', url], async () => {
    const response = await fetch(url);
    const data = await response.json();
    return data;
  });
}

export default useFetchData;

import React from 'react';
import { View, Text } from 'react-native';
import useFetchData from './useFetchData';

function MyComponent() {
  const { isLoading, isError, data, error } = useFetchData('https://api.example.com/data');

  if (isLoading) {
    return <Text>Loading...</Text>;
  }

  if (isError) {
    return <Text>Error: {error.message}</Text>;
  }

  return (
    <View>
      {data.map(item => (
        <Text key={item.id}>{item.name}</Text>
      ))}
    </View>
  );
}

Handling error with React-Navigation

RezaAbaskhanian — Sun, 23 Apr 2023 12:48:56 +0000

When using react-navigation in your React Native app, you may encounter HTTP status codes like 404 when navigating to a specific screen or route. Fortunately, react-navigation provides an easy way to handle these errors.

You can use the onError prop provided by react-navigation to handle HTTP status codes and other errors. This prop allows you to specify a function to be called when an error occurs during navigation.

Here's an example of how to handle a 404 error:

import { NavigationContainer } from '@react-navigation/native';

function App() {
  const handleNavigationError = (error) => {
    if (error.statusCode === 404) {
      // handle 404 error here
      console.log('404 error occurred');
    }
  };

  return (
    <NavigationContainer onError={handleNavigationError}>
      {/* Your navigation stack goes here */}
    </NavigationContainer>
  );
}

Designing Navigation Flows

RezaAbaskhanian — Sun, 23 Apr 2023 09:23:11 +0000

As mobile app developers, we often face the challenge of designing navigation flows that are intuitive and easy to use. One common solution to this challenge is nested navigation, which allows us to group related screens together and provide users with multiple ways to navigate through the app.

One effective way to implement nested navigation is by using a combination of tab bar, stack navigation, and drawer. Let's take a closer look at how this approach works.

First, the tab bar provides a high-level view of the app's main sections. Each tab represents a different section of the app, such as home, search, profile, and settings. When a user taps on a tab, the app switches to the corresponding section and displays the first screen of the stack.

Next, within each section, we can use stack navigation to allow users to drill down into specific screens. For example, in the home section, users might tap on a news item to read the full article, which would push a new screen onto the stack. They can then use the back button to navigate back to the previous screen.

Finally, we can use a drawer to provide access to secondary screens and actions that aren't part of the main navigation flow. The drawer can be accessed from any screen in the app by swiping from the left edge of the screen or by tapping on a menu icon in the top left corner.

By combining these three navigation patterns, we can create a nested navigation system that provides users with a clear and flexible way to explore the app's content. Users can quickly switch between main sections using the tab bar, navigate within each section using stack navigation, and access additional screens and actions using the drawer.

Overall, nested navigation is a powerful technique for creating intuitive and effective navigation flows in mobile apps. By using tab bar, stack navigation, and drawer, we can design an app that is easy to use and navigate, regardless of the complexity of its content.

import React from 'react';
import { createDrawerNavigator } from '@react-navigation/drawer';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import { createStackNavigator } from '@react-navigation/stack';
import { NavigationContainer } from '@react-navigation/native';

// Define the screens for each section
import HomeScreen from './screens/HomeScreen';
import SearchScreen from './screens/SearchScreen';
import ProfileScreen from './screens/ProfileScreen';
import SettingsScreen from './screens/SettingsScreen';
import ArticleScreen from './screens/ArticleScreen';

const HomeStack = createStackNavigator();
const SearchStack = createStackNavigator();
const ProfileStack = createStackNavigator();
const SettingsStack = createStackNavigator();
const Tab = createBottomTabNavigator();
const Drawer = createDrawerNavigator();

// Define the stack navigation for each section
const HomeStackScreen = () => (
  <HomeStack.Navigator>
    <HomeStack.Screen name="Home" component={HomeScreen} />
    <HomeStack.Screen name="Article" component={ArticleScreen} />
  </HomeStack.Navigator>
);

const SearchStackScreen = () => (
  <SearchStack.Navigator>
    <SearchStack.Screen name="Search" component={SearchScreen} />
    <SearchStack.Screen name="Article" component={ArticleScreen} />
  </SearchStack.Navigator>
);

const ProfileStackScreen = () => (
  <ProfileStack.Navigator>
    <ProfileStack.Screen name="Profile" component={ProfileScreen} />
  </ProfileStack.Navigator>
);

const SettingsStackScreen = () => (
  <SettingsStack.Navigator>
    <SettingsStack.Screen name="Settings" component={SettingsScreen} />
  </SettingsStack.Navigator>
);

// Define the main navigation
const MainNavigator = () => (
  <Tab.Navigator>
    <Tab.Screen name="Home" component={HomeStackScreen} />
    <Tab.Screen name="Search" component={SearchStackScreen} />
    <Tab.Screen name="Profile" component={ProfileStackScreen} />
    <Tab.Screen name="Settings" component={SettingsStackScreen} />
  </Tab.Navigator>
);

// Define the drawer navigation
const DrawerNavigator = () => (
  <Drawer.Navigator>
    <Drawer.Screen name="Main" component={MainNavigator} />
    <Drawer.Screen name="About" component={AboutScreen} />
    <Drawer.Screen name="Feedback" component={FeedbackScreen} />
  </Drawer.Navigator>
);

// Wrap the app in the navigation container
const App = () => (
  <NavigationContainer>
    <DrawerNavigator />
  </NavigationContainer>
);

export default App;

custom input filed

RezaAbaskhanian — Mon, 10 Apr 2023 08:52:06 +0000

I have created a custom input component for verifying a user's phone number using four input fields. This is a useful feature for authentication processes in mobile applications.

In this code, I have used React hooks such as useEffect and useState to manage the component's state and to focus on the first input field automatically when the component mounts.

Additionally, I have used the #useRef hook to create a reference to each input field, which allows you to focus on the next input field when the user enters a value in the current field.

The use of conditional styling with the #isFocused and #inputValues variables is a nice touch, which enhances the user experience by providing visual feedback when the user interacts with the input fields.

What's FPS Appropriate for React-Native?

RezaAbaskhanian — Mon, 06 Feb 2023 08:48:16 +0000

There's no one specific FPS that's considered appropriate for all React Native applications, as the ideal FPS depends on the particular requirements and characteristics of each app. However, as a general guideline, a frame rate of 60 FPS is considered smooth and fluid and a commonly used target for high-performance applications.

In some cases, a lower frame rate is acceptable, for simple or less-intensive applications. In contrast, in others, a higher frame rate may be necessary to achieve a certain level of visual quality or to support certain types of interactions.

Ultimately, the appropriate FPS for a React Native application depends on factors such as the desired user experience, the hardware and software capabilities of the target devices, and the specific performance requirements of the app

Tools for Debugging in React-Native

RezaAbaskhanian — Tue, 31 Jan 2023 10:11:24 +0000

Introducing a few tools for debugging :

1-react-dev-tools

This is a very common debugger in RN, with onPress (ctrl+m win) in the emulator, you will watch the debugger and selected Debug
or Debuggin js remotely , and then app reload and debug is run in browser,for usage react-dev-tools refer to this link
react-dev-tools

2-react-native-debugger

This tool is very efficient and also covers redux

react-native-debugger

3-react-native-crash-tester

This tool is very efficient and runs in vscode and it's very feature

react-native-crash-tester

4-Flipper

Very useful and beautiful and simply , my suggestion is to use this Flipper

What other debuggers do you use?