KeyboardAvoidingView in React Native - Mini App: Build & Ship

Build: Login Screen

A simple login screen that moves input fields up when the keyboard appears, so they are not hidden.

Target UI

-------------------------
|       Login Screen     |
|                       |
|  Email: [__________]  |
|  Password: [_______]  |
|                       |
|       [Login Button]   |
-------------------------

Use KeyboardAvoidingView to prevent keyboard from covering inputs

Include two TextInput fields: Email and Password

Add a Login button below inputs

KeyboardAvoidingView should adjust behavior based on platform (padding for iOS, height for Android)

Screen content should be centered vertically

Starter Code

React Native

import React from 'react';
import { View, TextInput, Button, KeyboardAvoidingView, Platform, StyleSheet } from 'react-native';

export default function LoginScreen() {
  return (
    <KeyboardAvoidingView
      style={styles.container}
      behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
    >
      <View style={styles.inner}>
        {/* TODO: Add TextInput fields and Button here */}
      </View>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  inner: {
    flex: 1,
    justifyContent: 'center',
    padding: 24
  }
});

Task 1

Task 2

Task 3

Solution

React Native

import React from 'react';
import { View, TextInput, Button, KeyboardAvoidingView, Platform, StyleSheet } from 'react-native';

export default function LoginScreen() {
  return (
    <KeyboardAvoidingView
      style={styles.container}
      behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
    >
      <View style={styles.inner}>
        <TextInput
          placeholder="Email"
          keyboardType="email-address"
          style={styles.input}
          autoCapitalize="none"
        />
        <TextInput
          placeholder="Password"
          secureTextEntry
          style={styles.input}
        />
        <Button title="Login" onPress={() => {}} />
      </View>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  inner: {
    flex: 1,
    justifyContent: 'center',
    padding: 24
  },
  input: {
    height: 40,
    borderColor: '#ccc',
    borderWidth: 1,
    marginBottom: 12,
    paddingHorizontal: 10,
    borderRadius: 4
  }
});

This login screen uses KeyboardAvoidingView to move the content up when the keyboard appears, so the input fields are not hidden. The behavior prop changes based on the platform: padding for iOS and height for Android, which are the recommended settings.

The inputs have placeholders and appropriate keyboard types. The password input hides the text for privacy. The button is placed below the inputs. The content is centered vertically with padding for nice spacing.

Final Result

Completed Screen

-------------------------
|       Login Screen     |
|                       |
|  Email: [__________]  |
|  Password: [_______]  |
|                       |
|       [Login Button]   |
-------------------------

When user taps an input, keyboard appears and the inputs move up so they remain visible

User can type email and password

Login button is tappable (no action implemented)

Stretch Goal

Add a TouchableWithoutFeedback to dismiss the keyboard when tapping outside inputs

💡 Hint

Wrap KeyboardAvoidingView with TouchableWithoutFeedback and call Keyboard.dismiss() on press

Practice

1. What is the main purpose of KeyboardAvoidingView in React Native?

easy

A. To move UI elements so they are not hidden by the keyboard

B. To change the keyboard layout

C. To disable the keyboard

D. To style the keyboard colors

Solution

1. Step 1: Understand the role of KeyboardAvoidingView

   KeyboardAvoidingView adjusts the screen layout when the keyboard appears so inputs stay visible.

2. Step 2: Identify the correct purpose

   It does not change keyboard layout or disable it, only moves UI elements to avoid overlap.

3. Final Answer:

   To move UI elements so they are not hidden by the keyboard -> Option A

4. Quick Check:

   KeyboardAvoidingView purpose = move UI [OK]

Hint: Remember: It moves views, does not change keyboard itself [OK]

Common Mistakes:

• Thinking it changes keyboard style
• Confusing it with keyboard disabling
• Assuming it controls keyboard input

2. Which of the following is the correct way to set the behavior prop for KeyboardAvoidingView on iOS?

easy

A.

B.

C.

D.

Solution

1. Step 1: Recall iOS recommended behavior

   On iOS, the common behavior is "padding" to add padding when keyboard appears.

2. Step 2: Match behavior prop value

   "padding" is the correct string to use; "height" and "position" are valid but less common on iOS; "scroll" is invalid.

3. Final Answer:

   <KeyboardAvoidingView behavior="padding"> -> Option D

4. Quick Check:

   iOS behavior = padding [OK]

Hint: Use "padding" for iOS KeyboardAvoidingView behavior [OK]

Common Mistakes:

• Using invalid behavior like "scroll"
• Confusing Android and iOS behavior props
• Omitting quotes around behavior value

3. What will happen when this code runs on Android?

import React from 'react';
import { KeyboardAvoidingView, TextInput, Platform } from 'react-native';

export default function App() {
  return (
    <KeyboardAvoidingView behavior={Platform.OS === 'ios' ? 'padding' : 'height'} style={{ flex: 1 }}>
      <TextInput placeholder="Type here" style={{ marginTop: 100, height: 40, borderColor: 'gray', borderWidth: 1 }} />
    </KeyboardAvoidingView>
  );
}

medium

A. The TextInput will be hidden behind the keyboard

B. The TextInput will move up when keyboard appears to stay visible

C. The app will crash due to invalid behavior prop

D. The keyboard will not appear at all

Solution

1. Step 1: Analyze behavior prop for Android

   For Android, behavior is set to "height", which adjusts the view height to avoid keyboard overlap.

2. Step 2: Predict UI behavior

   TextInput will move up as KeyboardAvoidingView adjusts height, keeping input visible.

3. Final Answer:

   The TextInput will move up when keyboard appears to stay visible -> Option B

4. Quick Check:

   Android behavior = height moves input up [OK]

Hint: Check Platform.OS to know behavior effect [OK]

Common Mistakes:

• Assuming behavior prop causes crash
• Thinking keyboard won't appear
• Ignoring platform-specific behavior

4. Identify the error in this code snippet:

import { KeyboardAvoidingView, TextInput } from 'react-native';

export default function App() {
  return (
    <KeyboardAvoidingView behavior="padding" style={{ flex: 1 }}>
      <TextInput placeholder="Enter text" />
    </KeyboardAvoidingView>
  );
}

The keyboard still hides the TextInput on iOS devices.

medium

A. Missing <ScrollView> to enable scrolling when keyboard appears

B. behavior prop should be set to "height" on iOS

C. TextInput needs a fixed height style

D. KeyboardAvoidingView must be wrapped in a View with flex: 0

Solution

1. Step 1: Understand KeyboardAvoidingView limits

   KeyboardAvoidingView alone may not scroll content; without ScrollView, inputs can be hidden if screen is small.

2. Step 2: Identify missing scroll container

   Wrapping content in ScrollView allows scrolling when keyboard appears, preventing hiding.

3. Final Answer:

   Missing <ScrollView> to enable scrolling when keyboard appears -> Option A

4. Quick Check:

   Use ScrollView with KeyboardAvoidingView to avoid hiding [OK]

Hint: Add ScrollView inside KeyboardAvoidingView for scroll [OK]

Common Mistakes:

• Changing behavior prop incorrectly
• Not using flex: 1 on container
• Assuming fixed height fixes keyboard overlap

5. You want to create a form that works well on both iOS and Android. Which is the best way to use KeyboardAvoidingView to handle the keyboard properly?

hard

A. Set behavior to "position" on iOS only and do not use ScrollView

B. Set behavior to "padding" on all platforms and wrap inputs in a ScrollView

C. Set behavior to "height" on Android, "padding" on iOS, and wrap inputs in a ScrollView

D. Do not use KeyboardAvoidingView; rely on default keyboard behavior

Solution

1. Step 1: Choose platform-specific behavior

   Best practice is to use "padding" on iOS and "height" on Android for KeyboardAvoidingView behavior.

2. Step 2: Wrap inputs in ScrollView

   ScrollView allows content to scroll if keyboard covers inputs, improving usability on small screens.

3. Final Answer:

   Set behavior to "height" on Android, "padding" on iOS, and wrap inputs in a ScrollView -> Option C

4. Quick Check:

   Platform behavior + ScrollView = best keyboard handling [OK]

Hint: Use platform check for behavior and add ScrollView [OK]

Common Mistakes:

• Using same behavior for all platforms
• Not wrapping inputs in ScrollView
• Ignoring Android keyboard behavior differences