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add 《实现 差不多理想的极简RN弹窗》
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zhaoyang committed Jan 9, 2024
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203 changes: 203 additions & 0 deletions content/posts/rn/alert-multiple/index.md
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---
title: "实现 差不多理想的极简RN弹窗"
date: 2023-11-01T12:00:11+08:00
draft: false
tags: [react-native]
---


## Q: 代码调用一个弹窗的极简方式是怎样的?

A: 这样子👉🏻 ***`XxModuleAlert.show({..})`***


> 为了这个极简用法的目标,我曾经 使用`rn-global-modal`封装过[TextInputAlert](../textinput-alert/),但依然有些问题或难用点,比如遮挡了`Toast`、更改mask颜色要改源码、布局上有些非正常的地方
>
>因为不希望弹窗遮挡`Toast`,于是研究了[`react-native-root-toast`](https://github.com/magicismight/react-native-root-toast),从而找到了封装理想弹窗的更快的方式
>
>于是,才造了一个 `AlertManager`

## ***Why*** need `AlertManager`

相信大家使用过RN官方`Modal`的,都知道,iOS弹窗无法弹两个,使用起来不满足`高内聚低耦合`,难受。。。

### RN官方Modal
- 缺点:耦合过多!须visible属性,多1个import useState,多1行代码setVisble声明,弹窗组件须嵌入容器组件

### rn-global-modal
- 优点:函数式调起弹窗,任意处可调用
- 缺点:iOS 不支持同时多层弹窗;toast的层级低于它 导致看不到/看不清


## ***What*** `AlertManager` provide
- 封装者:封装出高度解耦的弹窗。
- 使用方:使用极简!

### 优势
- vs Modal:去掉visible
- vs rn-global-modal: 支持多层弹窗, TextInput弹窗对键盘支持更好??


## ***How*** to use `AlertManager`

- 使用方:
```
XxModuleAlert.show({...});
XxModuleAlert.hide();
```

- 封装方:
```
class XxModuleAlert {
static show() {
AlertManager.show(<XxModuleView />, {
key: XxModuleView.name,
});
}
static hide() {
AlertManager.hide(XxModuleView.name);
}
}
export XxModuleAlert
const XxModuleView = () => {
...
return (...)
}
```


## 源码

```
import React from "react";
import { Dimensions, TouchableOpacity, View } from "react-native";
import RootSiblingsManager from "react-native-root-siblings";
const { width, height } = Dimensions.get("window");
/**
* 弹窗管理类
* - 支持同时弹出多个弹窗 (Modal、rn-global-modal 不支持)
* - 不会遮挡Toast(Modal、rn-global-modal 会遮挡Toast)
*/
class AlertManger {
static _alertNodes = {}; // { key1: { rootNode: <A/>, onClose: () => {} }, key2: { rootNode: <B/>, onClose: () => {} }
/**
* 展示弹窗
* @param {*} modalView 弹窗内所要展示的内容组件
* @param {*} options.key **必传** 弹窗唯一标识
* @param {*} options.maskStyle 蒙层样式 默认值:{ backgroundColor: 'rgba(0, 0, 0, 0.5)' }
* @param {*} options.maskTouchClosable 弹窗蒙层是否可点击关闭
* @param {*} options.closedCallback 弹窗关闭的回调
* @param {*} options.animationType [todo] 弹窗动画类型: none | fade | slide-up
*/
static show(modalView, options) {
const { key, maskTouchClosable, closedCallback, maskStyle } = options;
let rootNode;
const onClose = () => {
rootNode?.destroy();
rootNode = null;
closedCallback?.();
};
rootNode = new RootSiblingsManager(
(
<View
style={[
{
position: "absolute",
width: width,
height: height,
justifyContent: "center",
alignItems: "center",
backgroundColor: "rgba(0,0,0,0.5)",
},
maskStyle,
]}
>
<TouchableOpacity
style={{
position: "absolute",
width: width,
height: height,
}}
activeOpacity={1}
onPress={(e) => {
maskTouchClosable && this.hide(key);
}}
/>
{modalView}
</View>
)
);
this._alertNodes[key] = { rootNode, onClose };
console.log("this._alertNodes:::", this._alertNodes);
}
static hide(key) {
console.log(
"this._alertNodes?.[key]?.onClose::",
this._alertNodes?.[key]?.onClose
);
this._alertNodes?.[key]?.onClose?.();
delete this._alertNodes[key];
}
}
export default AlertManger;
/* ----------------------- Usage ---------------------- */
/*
* 弹窗开发者 这样封装自己的弹窗
```
import AlertManager from "app/components/dialog/AlertManager.js";
class BbModuleAlert {
static show() {
AlertManager.show(<BModuleView />, {
key: BModuleView.name,
maskTouchClosable: true,
closedCallback: () => {
console.log("BModuleView closedCallback");
},
});
}
static hide() {
AlertManager.hide(BModuleView.name);
}
}

export default BbModuleAlert;

const BModuleView = () => {
return (
...
)
}
```
*/

/*
* 弹窗调用者 这样调用弹窗
```
import BbModuleAlert from "./BbModuleAlert";
BbModuleAlert.show();
BbModuleAlert.hide();
```
*/

```
## todo
- 如何提供 页面级别的弹窗 `showInComp(comp)`
> **需求**:
> 某个弹窗,是当前A页面的子视图,若点击该弹窗种的按钮,跳转到下一个B页面时,该弹窗继续展示在A页面,B页面在最上层展示(是盖住该弹窗的)
- 像 取消&确认 弹窗,可以基于这个重做一遍了
8 changes: 7 additions & 1 deletion content/posts/rn/readme/index.md
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* [封装一个 低耦合、易用的文本输入框弹窗](../textinput-alert/)

* [优雅实现 RN多层弹窗]() [todo]
* [实现 RN弹窗 - 差不多理想的极简弹窗](../alert-multiple)

* [实践 多tab多列表滑动吸顶效果]() [todo]

* [实践 列表Item精确曝光埋点]() [todo]

* [实践 拆包]() [todo]


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