React Native中的CSS三角形

Question

我正在开发一个使用覆盖其他容器/ div的三角形的应用程序.如果之前用CSS解决了:

.triangle:after {
  content: "";
  display: block;
  position: absolute;
  top: 15px;
  left: -15px;
  width: 0;
  border-width: 0px 0px 15px 15px;
  border-style: solid;
}

但这在React中不起作用.什么是最好的解决方案？

Answer 1

仍然可以使用CSS技巧在React Native中绘制三角形.我写了一个类来封装它:https://github.com/Jpoliachik/react-native-triangle

如果你想自己动手写,我用这个工具:http://apps.eky.hk/css-triangle-generator/生成我想要的三角形,并修改款式反应母语的语法.

例如,在CSS中指向的Isosceles三角形90x90读取:

width: 0;
height: 0;
border-style: solid;
border-width: 0 45px 90px 45px;
border-color: transparent transparent #007bff transparent;

但在React Native中,样式将是:

triangle: {
     width: 0,
     height: 0,
     backgroundColor: 'transparent',
     borderStyle: 'solid',
     borderTopWidth: 0,
     borderRightWidth: 45,
     borderBottomWidth: 90,
     borderLeftWidth: 45,
     borderTopColor: 'transparent',
     borderRightColor: 'transparent',
     borderBottomColor: 'red',
     borderLeftColor: 'transparent',
   },

Answer 2

render() {
    return (
        <View style={[styles.triangle,styles.arrowUp]}/>
    );
}

和款式

const styles = {
    triangle: {
        width: 0,
        height: 0,
        backgroundColor: 'transparent',
        borderStyle: 'solid',
    },
    arrowUp: {
        borderTopWidth: 0,
        borderRightWidth: 30,
        borderBottomWidth: 30,
        borderLeftWidth: 30,
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: "tomato",
        borderLeftColor: 'transparent',
    },
    arrowRight: {
        borderTopWidth: 30,
        borderRightWidth: 0,
        borderBottomWidth: 30,
        borderLeftWidth: "tomato",
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: 'transparent',
        borderLeftColor: "tomato",
    },
    arrowDown: {
        borderTopWidth: 30,
        borderRightWidth: 30,
        borderBottomWidth: 0,
        borderLeftWidth: 30,
        borderTopColor: "tomato",
        borderRightColor: 'transparent',
        borderBottomColor: 'transparent',
        borderLeftColor: 'transparent',
    },
    arrowLeft: {
        borderTopWidth: 30,
        borderRightWidth: "tomato",
        borderBottomWidth: 30,
        borderLeftWidth: 0,
        borderTopColor: 'transparent',
        borderRightColor: "tomato",
        borderBottomColor: 'transparent',
        borderLeftColor: 'transparent',
    },
    arrowUpLeft: {
        borderTopWidth: 30,
        borderRightWidth: "tomato",
        borderBottomWidth: 0,
        borderLeftWidth: 0,
        borderTopColor: "tomato",
        borderRightColor: 'transparent',
        borderBottomColor: 'transparent',
        borderLeftColor: 'transparent',
    },
    arrowUpRight: {
        borderTopWidth: 0,
        borderRightWidth: "tomato",
        borderBottomWidth: 30,
        borderLeftWidth: 0,
        borderTopColor: 'transparent',
        borderRightColor: "tomato",
        borderBottomColor: 'transparent',
        borderLeftColor: 'transparent',
    },
    arrowDownLeft: {
        borderTopWidth: 30,
        borderRightWidth: 0,
        borderBottomWidth: 0,
        borderLeftWidth: "tomato",
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: 'transparent',
        borderLeftColor: "tomato",
    },
    arrowDownRight: {
        borderTopWidth: 0,
        borderRightWidth: 0,
        borderBottomWidth: 30,
        borderLeftWidth: "tomato",
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: "tomato",
        borderLeftColor: 'transparent',
    },
}

来源：https : //github.com/Jpoliachik/react-native-triangle