What is the best approach for clipping borders in a react-native application?

Take a look at the image showcasing what I aim to achieve with the green button in the layout: https://i.sstatic.net/cvzrK.png

Do you see the border above view B? My goal is to have a curved border around the bottom bar.

To accomplish this, I've structured views as follows -

import React from 'react'
import { Text, View } from 'react-native'

class OkScreen extends React.Component {
  static navigationOptions = {
    header: null
  }

  render () {
    return (
      <View
        style={{
          flexDirection: 'column',
          alignSelf: 'stretch',
          flexGrow: 1
        }}
      >
        <View
          style={{
            backgroundColor: 'yellow',
            flexGrow: 1
          }}
        />
        <View
          style={{
            borderWidth: 1
          }}
        />
        <View
          style={{
            backgroundColor: 'white',
            flexDirection: 'row',
            justifyContent: 'space-evenly',
            alignItems: 'center',
            height: 150,
            borderTopWidth: 10,
            borderTopColor: 'white'
          }}
        >
          <View
            style={{
              borderWidth: 10,
              alignItems: 'center',
              justifyContent: 'center',
              height: 152,
              width: 152,
              borderRadius: 76,
              bottom: 40
            }}
          >
            <View
              style={{
                height: 150,
                width: 150,
                borderRadius: 75,
                backgroundColor: 'green',
                alignItems: 'center',
                justifyContent: 'center',
                borderWidth: 10,
                borderColor: 'white'
              }}
            >
              <Text
                style={{
                  fontSize: 40
                }}
              >
                B
              </Text>
            </View>
          </View>
        </View>
      </View>
    )
  }
}

export default OkScreen

Unfortunately, this method did not yield the desired result and it looks like this -

https://i.sstatic.net/kbGvN.png

If you have any suggestions on alternative approaches that could help me achieve my goal, please feel free to share them. Your input is greatly appreciated.

Answer №1

To create a visually appealing design, consider adding a white circular background behind the button within the white view. This circle should have the necessary border style applied to it. Additionally, ensure that the button has a zIndex of 3 while the containing view has a zIndex of 2.

For proper positioning of views on top of each other, utilize position: absolute along with adjustments using top, bottom, left, and right properties. It is recommended to use the StyleSheet component to consolidate all styles and avoid hardcoded values for dimensions like width and height. Instead, rely on '%' units or obtain device dimensions using

const {width, height} = Dimensions.get('window')
for a responsive app design.

Answer №2

If you want to achieve a similar effect on the yellow element, you can utilize both radial-gradient and linear-gradient as shown below (not certain about compatibility in react native):

.yellow {
  height:100px;
  background:
    linear-gradient(#000,#000) right bottom/calc(50% - 50px) 3px no-repeat,
    linear-gradient(#000,#000) left bottom /calc(50% - 50px) 3px no-repeat,
    radial-gradient(circle at 50% 100%,transparent 49px,#000 50px,#000 52px,yellow 53px);
}

.green {
  width:80px;
  height:80px;
  margin: -40px auto;
  background:green;
  border-radius:50%;
}
<div class="yellow">

</div>
<div class="green">
</div>

An alternative approach is to blend border and box-shadow properties for a similar visual outcome:

.yellow {
  height:100px;
  background:yellow;
  border-bottom:2px solid;
}

.green {
  width:100px;
  height:100px;
  border:2px solid transparent;
  border-top-color:#000;
  box-sizing:border-box;
  margin: -17px auto;
  padding:2px;
  background:green content-box;
  box-shadow:0 0 0 10px #fff inset;
  border-radius:50%;
}
<div class="yellow">

</div>
<div class="green">
</div>

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