react native achieves similar scrolling selection effect

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To achieve a similar scrolling selection effect in React Native, you can use third-party libraries or custom components to achieve it. Here's a basic explanation and example:

Detailed explanation of the principle:

1. First, a scrollable container component is needed to display the list of options. In React Native, this can be achieved using components such as ScrollView or FlatList.

2. Next, you need a scrollbar component to control the scroll position. Scroll bars can be implemented using components such as Slider and Picker, or custom components.

3. Establish an association between the scroll bar and the scroll container. When the value of the scroll bar changes, you can listen to the scroll bar event and pass the corresponding value to the scroll container to achieve the scroll selection effect.

4. The selected value is calculated based on the scroll position. Based on the position and layout of the scroll container, the selected value corresponding to the current scroll position can be calculated and returned to the application for processing.

Usage scenario explanation:
The scroll selection effect is widely used in mobile applications. Here are some examples of usage scenarios:

1. Time picker: In date selection or reservation systems, you can use scrolling selection effects to allow users to conveniently select dates and times.

2. Selector/drop-down menu: In a form, you can use the scroll selection effect to display and select options, such as selecting a country, city, currency, etc.

3. Value selector: In some applications that require precise selection of values, such as adjusting volume, setting timers, etc., you can use the scroll selection effect to provide precise value selection.

4. Image scroll selector: In a photo gallery or photo album app, you can use the scroll selection effect to display a large number of images and allow users to scroll to select specific images.

To achieve a similar scrolling selection effect, you can use react-native-picker-selectthis third-party component. This component supports functions such as multiple selection, single selection, and number selection, and can also customize styles.

You can install this component with the following command:

npm install react-native-picker-select --save

Next, you need to introduce components into the pages you want to use and configure them according to your needs. For example, if you want to create a scroll picker that supports single selection, you can configure it as follows:

import React, { useState } from 'react';
import RNPickerSelect from 'react-native-picker-select';

const options = [
  { label: 'Option 1', value: 'option1' },
  { label: 'Option 2', value: 'option2' },
  { label: 'Option 3', value: 'option3' }
];

const App = () => {
  const [selectedOption, setSelectedOption] = useState('');

  return (
    <RNPickerSelect
      onValueChange={(value) => setSelectedOption(value)}
      items={options}
      placeholder={
   
   { label: 'Select an option', value: '' }}
      value={selectedOption}
    />
  );
};

export default App;

In the above code, we first define an optionsarray to store the options available for selection. Then, we created a Appcomponent and initialized a state in the component selectedOptionto save the currently selected option. Finally, we RNPickerSelectrender the component onto the page and configure itemsthe property to be optionsan array, placeholderthe property to be a default placeholder, and valuethe property to be the currently selected option.

When the user selects an option, onValueChangethe callback function will be triggered. We can update the status in this callback function selectedOptionto change the option.

Literature material links:
The following are some literature material links about implementing the scroll selection effect in React Native, which can help you have a deeper understanding of the implementation principles and usage methods:

1. React Native official documentation: React Native official documentation provides detailed information and examples about scrolling container components (such as ScrollView, FlatList) and scroll bar components (such as Slider, Picker). Link ↗  Link ↗  Link ↗

2. React Native Community: The React Native community provides many third-party libraries and components, including libraries that implement scrolling selection effects. You can find some popular libraries and examples here. Link ↗

Products currently using this technology:
There are many products currently using React Native to achieve scrolling selection effects. Here are some examples:

1. Instagram: Instagram is a popular social media app that uses React Native to implement scrolling effects such as date pickers and filters.

2. Airbnb: Airbnb is an online rental platform. Their mobile application uses React Native to implement scrolling selection effects, such as date pickers and filters.

3. Discord: Discord is a popular chat and voice calling app. They use React Native to implement scrolling effects such as channel selection and message filters.