@2hats/react-native-photo-view 中文文档教程
react-native-photo-view
为 React Native 提供自定义图像视图,允许执行 缩放图像。 适用于 iOS 和 Android。
此组件使用适用于 Android 的 PhotoDraweeView 和 MWPhotobrowser 在 iOS 上。
Usage
import PhotoView from 'react-native-photo-view';
基础知识:
<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}} />
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 |
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 功能相似,但有几个主要区别:
- 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
只需两个简单的步骤:
npm install --save react-native-photo-view
rnpm link react-native-photo-view
Manual installation
- 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')
- Add one more dependency to
android/app/build.gradle
dependencies {
compile project(':react-native-photo-view')
}
- Add it to your
MainActivity.java
for RN < 0.29 and to yourMainApplication.java
for RN >=0.29
要注册 PhotoViewPackage
,您需要更改 MainActivity
或MainApplication
取决于您应用的 React Native 版本:
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
);
}
// ...
}