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Provides custom Image view for React Native that allows to perform pinch-to-zoom...

 2 years ago
source link: https://reactnativeexample.com/provides-custom-image-view-for-react-native-that-allows-to-perform-pinch-to-zoom-on-images/
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react-native-photo-view

Provides custom Image view for React Native that allows to perform
pinch-to-zoom on images. Works on both iOS and Android.

This component uses PhotoDraweeView for Android and MWPhotobrowser on iOS.

Usage

import PhotoView from 'react-native-photo-view';
JavaScript

Basics:

<PhotoView
  source={{uri: 'https://facebook.github.io/react/img/logo_og.png'}}
  minimumZoomScale={0.5}
  maximumZoomScale={3}
  androidScaleType="center"
  onLoad={() => console.log("Image loaded!")}
  style={{width: 300, height: 300}} />
JavaScript

Properties

Property Type Description source Object same as source for other React images loadingIndicatorSource Object source for loading indicator fadeDuration int duration of image fade (in ms) minimumZoomScale float The minimum allowed zoom scale. The default value is 1.0 maximumZoomScale float The maximum allowed zoom scale. The default value is 3.0 showsHorizontalScrollIndicator bool iOS only: When true, shows a horizontal scroll indicator. The default value is true. showsVerticalScrollIndicator bool iOS only: When true, shows a vertical scroll indicator. The default value is true. scale float Set zoom scale programmatically androidZoomTransitionDuration int Android only: Double-tap zoom transition duration androidScaleType String Android only: One of the default Android scale types: "center", "centerCrop", "centerInside", "fitCenter", "fitStart", "fitEnd", "fitXY" onLoadStart func Callback function onLoad func Callback function onLoadEnd func Callback function onProgress func iOS only: Callback function, invoked on download progress with {nativeEvent: {loaded, total}}. onTap func Callback function (called on image tap) onViewTap func Callback function (called on tap outside of image) onScale func Callback function

Compared to react-native-image-zoom

react-native-image-zoom functionality is similar, but there are several major differencies:

  • PhotoView is based on PhotoDraweeView which is the "PhotoView For Fresco". It works better, it supports several
    important callbacks out-of-box and it is, actually, recommended by Chris Banes, because his
    PhotoView (base for react-native-image-zoom) doesn't completely
    support Facebook Fresco;
  • PhotoView has more options like fadeDuration and minimumZoomScale/maximumZoomScale and more important callbacks;
  • PhotoView is written in the same manner as default React Image, and it supports most of the
    features Image has (the goal is to be fully compaitable with Image and support absolutely everything);
  • It is possible to use PhotoView as a container (currently iOS only)!

Automatic installation

Just two simple steps:

npm install --save react-native-photo-view
Console
react-native link react-native-photo-view
Console

Manual installation

Android

  1. Add these lines to android/settings.gradle
include ':react-native-photo-view'
project(':react-native-photo-view').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-photo-view/android')
  1. Add one more dependency to android/app/build.gradle
dependencies {
    compile project(':react-native-photo-view')
}
  1. Add it to your MainActivity.java for RN < 0.29 and to your MainApplication.java for RN >=0.29

To register PhotoViewPackage, you need to change the MainActivity or MainApplication depending on React Native version of your app:

import com.reactnative.photoview.PhotoViewPackage;

// ...

public class MainActivity extends ReactActivity {
    // ...

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
          new PhotoViewPackage() // add this manager
      );
    }

    // ...
}
  1. Add this line to your podfile
  pod 'react-native-photo-view', path: './node_modules/react-native-photo-view'
  1. Run pod install

GitHub

https://github.com/alwx/react-native-photo-view


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