Sharing and clipboard in React Native - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the Clipboard API in React Native?

The Clipboard API allows apps to copy text to and paste text from the device's clipboard, enabling easy sharing of text data between apps.

beginner

Which React Native module is used to share content like text or URLs with other apps?

The Share module is used to open the native sharing dialog, letting users share text, URLs, or other content with other apps.

beginner

How do you copy text to the clipboard in React Native?

Use Clipboard.setString('your text') to copy text to the clipboard.

intermediate

What method do you use to read text from the clipboard in React Native?

Use Clipboard.getString() which returns a Promise resolving to the clipboard text.

intermediate

Describe the basic steps to share a URL using React Native's Share API.

1. Import Share from 'react-native'.
2. Call Share.share({ message: 'Check this out: https://example.com' }).
3. The native share dialog opens for the user to choose an app.

Which React Native module lets you open the native share dialog?

A Clipboard

B AsyncStorage

C Linking

D Share

The Share module is designed to open the native sharing dialog for sharing content.

How do you copy text 'Hello' to the clipboard in React Native?

A Clipboard.copy('Hello')

B Clipboard.setString('Hello')

C Share.share('Hello')

D Clipboard.write('Hello')

Clipboard.setString('Hello') copies the text 'Hello' to the clipboard.

What does Clipboard.getString() return?

A An object with clipboard data

B A string immediately

C A Promise resolving to a string

D Nothing

Clipboard.getString() returns a Promise that resolves to the clipboard text.

Which of these is NOT a typical use of the Share API?

A Copying text to clipboard

B Sharing URLs

C Sharing text messages

D Sharing images

Copying text to clipboard is done with Clipboard API, not Share API.

What happens when you call Share.share({ message: 'Hello' })?

A Native share dialog opens with 'Hello' as content

B App crashes

C Text 'Hello' is copied to clipboard

D Nothing happens

Share.share opens the native share dialog with the provided message.

Explain how to copy and paste text using React Native's Clipboard API.

Think about how you put text into the clipboard and how you get it back.

Describe the process of sharing a URL from your app using React Native's Share API.

Focus on the steps from code to user interaction.

Practice

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

easy

A. To copy and paste text between apps

B. To share images on social media

C. To send emails from the app

D. To open external web links

Solution

1. Step 1: Understand Clipboard functionality

   The Clipboard API is designed to handle text copying and pasting between apps.

2. Step 2: Compare with other options

   Sharing images, sending emails, and opening links are not Clipboard's main tasks.

3. Final Answer:

   To copy and paste text between apps -> Option A

4. Quick Check:

   Clipboard = copy-paste text [OK]

Hint: Clipboard is for copy-paste text only [OK]

Common Mistakes:

• Confusing Clipboard with sharing images
• Thinking Clipboard sends emails
• Assuming Clipboard opens web links

2. Which of the following is the correct way to import the Clipboard API in React Native?

easy

A. import { Clipboard } from 'react-native';

B. import Clipboard from '@react-native-clipboard/clipboard';

C. import Clipboard from 'react-native';

D. import Clipboard from 'react-native-clipboard';

Solution

1. Step 1: Identify the official Clipboard package

   React Native moved Clipboard to a separate package '@react-native-clipboard/clipboard'.

2. Step 2: Check import syntax

   The correct import is default import from '@react-native-clipboard/clipboard'.

3. Final Answer:

   import Clipboard from '@react-native-clipboard/clipboard'; -> Option B

4. Quick Check:

   Clipboard import = '@react-native-clipboard/clipboard' [OK]

Hint: Clipboard is from '@react-native-clipboard/clipboard' package [OK]

Common Mistakes:

• Importing Clipboard directly from 'react-native'
• Using named import instead of default
• Using wrong package names

3. What will be the output of this React Native code snippet?

import Clipboard from '@react-native-clipboard/clipboard';

Clipboard.setString('Hello World');
const text = await Clipboard.getString();
console.log(text);

medium

A. undefined

B. Error: Clipboard.getString is not a function

C. 'Hello World'

D. null

Solution

1. Step 1: Understand Clipboard.setString usage

   This sets the clipboard content to 'Hello World'.

2. Step 2: Understand Clipboard.getString usage

   It asynchronously retrieves the clipboard content, which is 'Hello World'.

3. Final Answer:

   'Hello World' -> Option C

4. Quick Check:

   Clipboard content = 'Hello World' [OK]

Hint: Clipboard.getString returns the last set string [OK]

Common Mistakes:

• Forgetting await on Clipboard.getString
• Expecting undefined or null instead of set string
• Confusing Clipboard API methods

4. You wrote this code to share text but it does not work:

import { Share } from 'react-native';

const shareText = async () => {
  Share.share('Hello!');
};

What is the error?

medium

A. You cannot share text in React Native

B. Share must be imported from '@react-native-share/share'

C. Share.share is not async function

D. Share.share requires an object with a message property

Solution

1. Step 1: Check Share.share argument type

   Share.share expects an object like { message: 'text' }, not a string.

2. Step 2: Identify correct usage

   Passing a string directly causes failure; must pass { message: 'Hello!' }.

3. Final Answer:

   Share.share requires an object with a message property -> Option D

4. Quick Check:

   Share.share argument = object with message [OK]

Hint: Share.share needs { message: 'text' } object [OK]

Common Mistakes:

• Passing string directly instead of object
• Importing Share from wrong package
• Ignoring async/await usage

5. You want to create a button that copies user input text to clipboard and then shares it. Which code snippet correctly combines Clipboard and Share APIs?

hard

A. const copyAndShare = async (text) => {
await Clipboard.setString(text);
await Share.share({ message: text });
};

B. const copyAndShare = (text) => {
Clipboard.setString(text);
Share.share(text);
};

C. const copyAndShare = async (text) => {
Clipboard.setString(text);
Share.share({ message: await Clipboard.getString() });
};

D. const copyAndShare = async (text) => {
await Clipboard.getString();
await Share.share({ message: text });
};

Solution

1. Step 1: Use async/await for Clipboard.setString

   Clipboard.setString returns a promise, so await ensures text is copied before sharing.

2. Step 2: Pass correct object to Share.share

   Share.share requires an object with message property containing the text to share.

3. Step 3: Verify combined usage

   const copyAndShare = async (text) => { await Clipboard.setString(text); await Share.share({ message: text }); }; correctly awaits Clipboard.setString and then shares the same text properly.

4. Final Answer:

   const copyAndShare = async (text) => { await Clipboard.setString(text); await Share.share({ message: text }); }; -> Option A

5. Quick Check:

   Await Clipboard.setString + Share.share({ message }) [OK]

Hint: Await Clipboard.setString before Share.share({ message }) [OK]

Common Mistakes:

• Not awaiting Clipboard.setString
• Passing string directly to Share.share
• Calling Clipboard.getString unnecessarily