• React Native 弹窗(三)自定义(使用Modal实现)


    针对弹窗之前已讨论过两种

    1、系统的Alert、

    2、Ant Design React Native库中的Modal.alert

    但这两种都各有自己的局限性,所以现在我么就使用用Modal来自定义实现弹窗

    一、Modal

    Modal组件可以用来覆盖包含React Native根视图的原生视图(如UIViewController,Activity),用它可以实现遮罩的效果

    Modal提供的属性有:

    animationType(动画类型) PropTypes.oneOf([‘none’, ‘slide’, ‘fade’]

    • none:没有动画
    • slide:从底部滑入
    • fade:淡入视野

    onRequestClose(被销毁时会调用此函数)

    onShow(模态显示的时候被调用)

    transparent (透明度) bool

    • 为true时,使用透明背景渲染模态。

    visible(可见性) bool

    onOrientationChange(方向改变时调用)

    • 在模态方向变化时调用,提供的方向只是 ” 或 ”。在初始化渲染的时候也会调用,但是不考虑当前方向。

    supportedOrientations(允许模态旋转到任何指定取向)[‘portrait’, ‘portrait-upside-down’, ‘landscape’,’landscape-left’,’landscape-right’])

    • 在iOS上,模态仍然受 info.plist 中的 UISupportedInterfaceOrientations字段中指定的限制。
    export interface ModalBaseProps {
        // Only `animated` is documented. The JS code says `animated` is
        // deprecated and `animationType` is preferred.
        animated?: boolean;
        /**
         * The `animationType` prop controls how the modal animates.
         *
         * - `slide` slides in from the bottom
         * - `fade` fades into view
         * - `none` appears without an animation
         */
        animationType?: "none" | "slide" | "fade";
        /**
         * The `transparent` prop determines whether your modal will fill the entire view.
         * Setting this to `true` will render the modal over a transparent background.
         */
        transparent?: boolean;
        /**
         * The `visible` prop determines whether your modal is visible.
         */
        visible?: boolean;
        /**
         * The `onRequestClose` prop allows passing a function that will be called once the modal has been dismissed.
         * _On the Android platform, this is a required function._
         */
        onRequestClose?: () => void;
        /**
         * The `onShow` prop allows passing a function that will be called once the modal has been shown.
         */
        onShow?: (event: NativeSyntheticEvent<any>) => void;
    }

    二、项目实际使用

    效果图:

     代码:

    ValueSingleAlertModal弹窗组件
    import React, { Component } from "react";
    import { Modal, Text, View, TouchableOpacity, StyleSheet, } from "react-native";
    import { IBasePageProp, IBaseRenderItem } from '../../../../utils/face/base'
    import { DeviceHelp } from "../../../../utils/define/helper";
    
    export interface IProps extends IBasePageProp {
        title: string,
        message: string,
        btntiltle: string,
    }
    // 弹出菜单组件
    export default class ValueSingleAlertModal extends React.Component<IProps> {
    
    
        state = {
            modalVisible: false,
        };
    
        setModalVisible(visible: any) {
            this.setState({ modalVisible: visible });
        }
    
        render() {
            return (
                <Modal
                    animationType="slide"
                    transparent={true}
                    visible={this.state.modalVisible}
                    onRequestClose={() => {
                        this.setModalVisible(false)
                    }}
                >
                    <View style={{
                        flex: 1, backgroundColor: 'rgba(0, 0, 0, 0.6)', justifyContent: 'center',
                        alignItems: 'center'
                    }}>
                        <View style={style.bg}>
                            {/* 标题 */}
                            <Text style={style.toptext}>{this.props.title}</Text>
                            {/* 内容 */}
                            <Text style={style.centerText}>{this.props.message}</Text>
                            {/* 分割线 */}
                            <View style={style.line}></View>
                            {/* 取消按钮 */}
                            <TouchableOpacity onPress={() => {
                                this.setModalVisible(false);
                            }}>
                                <Text style={style.btnText}>{this.props.btntiltle}</Text>
                            </TouchableOpacity>
                        </View>
                    </View>
                </Modal>
            );
        }
    
    }
    
    const style = StyleSheet.create({
    
        bg: {
            backgroundColor: '#FFFFFF',
            borderRadius: 10,
             DeviceHelp.screenW - 100,
        },
    
        toptext: {
            fontWeight: 'bold',
            color: '#333333',
            marginTop: 20,
            textAlign: 'center',
            fontSize: DeviceHelp.fontSize(17)
        },
    
        centerText: {
            color: '#333333',
            textAlign: 'center',
            paddingTop: 15,
            paddingLeft: 15,
            paddingRight: 15,
            fontSize: DeviceHelp.fontSize(15)
        },
    
        line: {
            marginTop: 20,
            backgroundColor: '#99999955',
            height: 1,
        },
    
        btnText: {
            marginTop: 15,
            marginBottom: 15,
            color: "#3498FE",
            fontWeight: "bold",
            textAlign: "center",
            fontSize: DeviceHelp.fontSize(18),
        },
    
    
    })

    使用:

    1、引用文件

    import ValueSingleAlertModal from '../valuedataview/cptvaluesiglealert'

    2、声明singleAlert

    export default class extends UtilsRootPage<IBasePageProp, valueDataStates> {
        // 成员变量
        private singleAlert!: ValueSingleAlertModal;

    3、render方法中渲染

    <ValueSingleAlertModal
                        ref={(c) => {
                            if (c != null) {
                                this.singleAlert = c;
                            }
                        }}
                        title='我是标题'
                        message='我是内容我是内容我是内容'
                        btntiltle='知道了'
                    />

    4、调用弹窗

    this.singleAlert.setModalVisible(true)

    备注:

    官方文档:https://docs.nativebase.io/modal

    Ant Design React Native的Modal对话框:https://rn.mobile.ant.design/components/modal-cn/

    参考资料:https://blog.csdn.net/qianzhihe1992110/article/details/77291407

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  • 原文地址:https://www.cnblogs.com/lijianyi/p/15294619.html
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