如何更改多个按钮中按下颜色的按钮 React Native [英] How to change button on pressed color in multiple buttons React Native

问题描述

我的 React Native 应用中有 3 个按钮.当用户单击按钮 1 时，我需要将其颜色更改为橙​​色.但其他按钮应具有默认颜色(灰色).如果用户下次单击按钮 3，颜色应更改为橙色，但第 1 个按钮颜色应重置为默认值.我对原生反应完全陌生，这就是我尝试过的.但它适用于所有按钮.我知道如果我可以拥有多个具有唯一 Id 的状态，就可以做到.但我不知道方法.

I have 3 buttons in my react native app. When user clicks button 1 I need to change it color to orange. But other buttons should have the default color (grey). If user clicks the button 3 next time, color should change to orange ,but that 1st button color should reset to default. I'm totally new to react native and this is what I tried. But it applies for all buttons. I know if I can have multiple states with unique Id , it can be done. But I don't know the method.

<Text style={ styles.switchButtonsTitle }>Choose Type of User</Text>
<TouchableOpacity onPress={(userType) =>
    this.selectionOnPress("BASIC")} >
    <Text style={_style}>
        <Text style={styles.switchButtonsText}>BASIC</Text>
    </Text>
</TouchableOpacity>


<TouchableOpacity onPress={(userType) =>
    this.selectionOnPress("INTERMEDIATE")}>
    <Text style={_style}>
        <Text style={styles.switchButtonsText}>INTERMEDIATE</Text>
    </Text>
</TouchableOpacity>

<TouchableOpacity onPress={(userType) =>
    this.selectionOnPress("ADVANCED")}>
    <Text style={{backgroundColor: this.state.backgroundColor}}>
        <Text style={styles.switchButtonsText}>ADVANCED</Text>
    </Text>
</TouchableOpacity>

selectionOnPress

selectionOnPress

selectionOnPress(userType) {
    this.setState({
        onClicked: true
    });
} 

道具

constructor(props) {
    super(props);
    this.state = {
        onClicked: false
    }
    this.selectionOnPress = this.selectionOnPress.bind(this)
}

render(不加所有代码，只加本帖有用的代码)

render(not adding the all codes, only added the useful codes for this post)

render() {
    var _style;
    if (this.state.onClicked) { // clicked button style
        _style = {
            backgroundColor: "red"
        }
    }
    else { // default button style
        _style = {
            backgroundColor: "blue"
        }
    }

推荐答案

我对你的代码做了一些修改

I make some modification on your code

 export default class App extends Component {
constructor(props) {
    super(props);
    this.state = { selectedButton: null };
    this.selectionOnPress = this.selectionOnPress.bind(this);
}

selectionOnPress(userType) {
    this.setState({ selectedButton: userType });
}

render() {
    return (
        <View>
            <Text style={styles.switchButtonsTitle}>
                Choose Type of User
            </Text>
            <TouchableOpacity
                onPress={() => this.selectionOnPress("BASIC")}
            >
                <Text
                    style={{
                        backgroundColor:
                            this.state.selectedButton === "BASIC"
                                ? "red"
                                : "grey"
                    }}
                >
                    <Text style={styles.switchButtonsText}>BASIC</Text>
                </Text>
            </TouchableOpacity>

            <TouchableOpacity
                onPress={() => this.selectionOnPress("INTERMEDIATE")}
            >
                <Text
                    style={{
                        backgroundColor:
                            this.state.selectedButton === "INTERMEDIATE"
                                ? "red"
                                : "grey"
                    }}
                >
                    <Text style={styles.switchButtonsText}>
                        INTERMEDIATE
                    </Text>
                </Text>
            </TouchableOpacity>

            <TouchableOpacity
                onPress={() => this.selectionOnPress("ADVANCED")}
            >
                <Text
                    style={{
                        backgroundColor:
                            this.state.selectedButton === "ADVANCED"
                                ? "red"
                                : "grey"
                    }}
                >
                    <Text style={styles.switchButtonsText}>
                        INTERMEDIATE
                    </Text>
                </Text>
            </TouchableOpacity>
        </View>
    );
}
}


... don't forget to define your styles

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