Question

我正在使用react native开发一个项目。我使用了地图功能来渲染按钮。当页面加载时，第一个按钮要为蓝色，其余按钮要为白色。单击下一个按钮后，想要更改上一个按钮的颜色和图像。按下的按钮要为蓝色。截至目前，当我单击第一个按钮时，其余按钮的颜色也在改变。任何人都可以纠正我哪里出了问题。预先感谢。

constructor(props) {
    super(props);
    this.state = {
      isLoading: false,
      prd: [],
      on: false,
      prdData: "All",
    };
  }

  componentDidMount() {
    this.setState({ isLoading: false });
    let data = [
      {
        id: 0,
        value: "All",
        img1: require("../../../kr/images/all_white.png"),
        img2: require("../../../kr/images/all_blue.png"),
      },
      {
        id: 41,
        value: "list",
        img1: require("../../../kr/images/package_white.png"),
        img2: require("../../../kr/images/package_blue.png"),
      },
      {
        id: 13,
        value: "list2",
        img1: require("../../../kr/images/accident_white.png"),
        img2: require("../../../kr/images/accident_blue.png"),
      },
      { id: 14, value: "Term" },
    ];
    this.setState({ prd: data });
  }

 render() {
    const { on } = this.state;
    return (
<View>
            {/* Button contain starts */}
            <View style={styles.container}>
              <ScrollView
                horizontal={true}
                showsHorizontalScrollIndicator={false}
              >
                {this.state.product.map((item, i) => {
                  return (
                    <Button
                      onPress={() => {
                        this.setState({ on: !this.state.on });
                      }}
                      style={on ? styles.btnActive : styles.btnNonActive}
                    >
                      <Image
                        style={{
                          width: 18,
                          height: 17,
                          flex: 1,
                          flexDirection: "row",
                          backgroundColor: "white",
                        }}
                        source={
                          this.state.activeIndex === 0 ? item.img1 : item.img2
                        }
                      />{" "}
                      <Text
                        style={{
                          color: "black",
                          fontSize: 11,
                          flex: 1,
                          flexDirection: "row",
                        }}
                      >
                        {item.value}
                      </Text>
                    </Button>
                  );
                })}
              </ScrollView>
            </View>
)

Answer 1

创建一个项目组件并以int处理颜色更改状态，不要使用主要组件，

小吃：https://snack.expo.io/@ashwith00/grounded-cookie

这里是一个例子，


const data = ['apple', 'ball', 'cat', 'dog'];

export default function App() {
  return (
    <View style={styles.container}>
      <ScrollView>
        {data.map((item) => (
          <Item
            key={item}
            item={item}
            onPress={() => {
              console.log(item);
            }}
          />
        ))}
      </ScrollView>
    </View>
  );
}

const Item = ({ item, onPress }) => {
  const [on, setOn] = React.useState(false);
  return (
    <View style={styles.item}>
      <Text>{item}</Text>
      <TouchableHighlight
        onPress={() => {
          setOn(true);
          onPress();
        }}
        style={[styles.button, on && styles.activeBuyton]}>
        <Text style={{ color: '#ffffff' }}>Click</Text>
      </TouchableHighlight>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    paddingTop: Constants.statusBarHeight,
    backgroundColor: '#ecf0f1',
    padding: 8,
  },
  item: {
    alignSelf: 'stretch',
    height: 100,
    marginBottom: 20,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#00000010',
  },
  button: {
    alignSelf: 'stretch',
    marginHorizontal: 10,
    height: 50,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: 'blue',
  },
  activeBuyton: {
    backgroundColor: 'green',
  },
});

如何更改动态渲染的按钮的背景颜色和图像

1 个答案: