React Native: The behavior of the 'top' property is consistent, while the 'bottom' property is not performing as anticipated

Within my React Native application, I have implemented the following code:

<View
  style={{
    width: 50,
    height: 50,
    borderWidth: 1,
  }}
>
  <View style={{
    width: 5,
    height: 5,
    backgroundColor: 'red',
    top: 10,
    left: 10
  }}></View>
</View>

Upon execution, the outcome is as follows:

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

However, swapping top with bottom leads to a different result:

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

When changing the child element's styling to position: absolute, the behavior aligns with expectations:

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

The Questions Arising Are:

1) What causes the red dot to appear above the black square in the second image?

2) Given that the red dot is the sole child of the black square, how does adding position: absolute make a difference?

3) Why does top function as anticipated in all scenarios, while bottom exhibits expected behavior only in the third case?

Answer №1

In React-Native, the default positioning for layout elements is relative, so a distance of 10px from the bottom of the initial position will be outside of the container, which is the expected behavior.

If you want to position the dot against the bounds of the container, set the child's position to absolute.


    <View
      style={{
        width: 50,
        height: 50,
        borderWidth: 1,
        position: 'relative' // by default anyway
      }}
    >
      <View
        style={{
          width: 5,
          height: 5,
          backgroundColor: "red",
          bottom: 10,
          left: 10,
          position: 'absolute'
        }}
      />
    </View>

Answer №2

1) Not specifying position: absolute means all positioning commands are relative to the element's initial position.

2) It alters how positioning commands (top, left, right, bottom) are understood in relation to the parent element.

3) The reason is that top remains consistent regardless of the position setting, while bottom may vary depending on whether position is set to relative or absolute.

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