Question

对于2种错误，我想显示2种不同的警报

我想在显示下一个警报之前删除所有已存在的警报。

现在，一个警报位于上一个警报的上方，

在显示下一个警报之前，我如何在警报中消除警报？

Answer 1

只需关闭反应本机警报

Alert.alert(
  'No Internet !',
  'Your internet does not seems to work',
  [
    { text: "Try again", onPress: () =>this.myfunction()},
    { text: "Dismiss", onPress: () =>console.log('dismissing alert')}
  ], 
  { cancelable: false }
)

凉丸！

Answer 2

您不能以编程方式关闭本机警报，可以使用具有“可见”道具的自定义警报框或Modal组件：https://facebook.github.io/react-native/docs/modal

Answer 3

您可以保留布尔检查“ isAlertVisible”来处理这种情况。每当触发警报时，将“ isAlertVisible”标记为true，并在打开每个警报之前对其进行添加检查，以确认“ isAlertVisible”是否为真。

Answer 4

实际上可以！

例如：

Alert.alert(
  'Oops!',
  'The provided passwords did not match',
  [
    { text: "Try again", onPress: () => null}
  ], 
  { cancelable: false }
)

在这种情况下，按Try again将关闭Alert。

Answer 5

To handle this situation, the best solution is to design custom alert by using  **react-native-dialog**. here is running sample code, it works fine for me and you can give your custom color and style in this alert
import React, { Component } from 'react';
import { StyleSheet, Platform, View, Text,TouchableOpacity } from 'react-native'; 
// import PropTypes from 'prop-types';
// import Dialog from "react-native-dialog";
 import Alertfunction from './src/CustomAlert'




 export default class App extends Component{

    render() {

      return (

        <Alertfunction Title={"Alert"} FontSize = {30} FontColor= '#FF9800'  Visible={true}/>


      );
    }
  }


const styles = StyleSheet.create({

 MainContainer :{

  flex:1,
  paddingTop: (Platform.OS) === 'ios' ? 20 : 0,
  alignItems: 'center',
  justifyContent: 'center',

  }

});



CustomAlert.js

import React, { Component } from 'react';
import { StyleSheet, Platform, View, Text,TouchableOpacity } from 'react-native'; 
import PropTypes from 'prop-types';
import Dialog from "react-native-dialog";

class Alertfunction extends Component {
    state = {
        dialogVisible: this.props.Visible
      };

      showDialog = () => {
        this.setState({ dialogVisible: this.props.Visible });
      };

      handleCancel = () => {
         this.setState({ dialogVisible: false });
        // this.props.Visible=false;
      };

      handleDelete = () => {
         this.setState({ dialogVisible: false });
        //this.props.Visible=false;
      };

  render() {

    return (

            <View>
                <TouchableOpacity onPress={this.showDialog}>
                <Text >{this.props.Title}</Text>
                </TouchableOpacity>
                <Dialog.Container visible={this.state.dialogVisible}>
                <Dialog.Title style={{fontSize : this.props.FontSize, color: this.props.FontColor}}>{this.props.Title}</Dialog.Title>
                <Dialog.Description style={{fontSize : this.props.FontSize, color: this.props.FontColor}}>
                    Do you want to delete this account? You cannot undo this action.
                </Dialog.Description>
                <Dialog.Button style={{fontSize : this.props.FontSize, color: this.props.FontColor}} label="Cancel" onPress={this.handleCancel} />
                <Dialog.Button style={{fontSize : this.props.FontSize, color: this.props.FontColor}} label="ok" onPress={this.handleDelete} />
                </Dialog.Container>
            </View>

    );
  }
 }

export default Alertfunction;
Alertfunction.propTypes =
{
    Title: PropTypes.string,
  FontSize: PropTypes.number,
  FontColor: PropTypes.string,
  Visible: PropTypes.bool,

}

Alertfunction.defaultProps =
{
    Title: "Default Name",
  FontColor: "#00E676",
  FontSize: 15,
  Visible:false
}

const styles = StyleSheet.create({

 MainContainer :{

  flex:1,
  paddingTop: (Platform.OS) === 'ios' ? 20 : 0,
  alignItems: 'center',
  justifyContent: 'center',

  }

});

以编程方式关闭本机警报

5 个答案: