How to Horizontally Center Content of Horizontal Scrollview

React Native: vertical centering when using ScrollView

I solved this issue with flexGrow instead of flex

<ScrollView contentContainerStyle={{ flexGrow: 1, justifyContent: 'center' }}>

This makes the content container stretch to fill the ScrollView but does not restrict the maximum height, so you can still scroll correctly when the content extends the bounds of the ScrollView

Center element horizontally in visible area in a scroll view

The only solution I came up with is calculate it manually. Here's the code (with React):

const rowRef = useRef<HTMLDivElement>(null);

let scrollLeft: any = null;
let throttleScrollEventActive = false;

function handleScrollEvent(event: any, element: any) {
  if (throttleScrollEventActive) return;
  window.requestAnimationFrame(function () {
    const left = element.getBoundingClientRect().left;
    if (scrollLeft != left) {
      scrollLeft = left;
      setVisibleButtonWidth();
    }
    throttleScrollEventActive = false;
  });
  throttleScrollEventActive = true;
}

useEffect(() => {
  setVisibleButtonWidth();
  const el = rowRef.current;
  if (!el) return;
  window.addEventListener('scroll', (e) => handleScrollEvent(e, el), true);
  return () => {
    window.removeEventListener('scroll', (e) => handleScrollEvent(e, el), true);
  };
}, [rowRef.current]);

function setVisibleButtonWidth() {
  const el = rowRef.current;
  if (!el) return;

  const parent = el.parentElement;
  if (!parent) return;
  const clientWidth = parent.clientWidth;
  const rect = el.getBoundingClientRect();
  const left = rect.left;

  const vw = Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0);
  let width = null;

  if (rect.left < 0 && rect.right < vw) {
    width = rect.right;
  } else if (rect.left < 0 && rect.right > vw) {
    width = vw;
  } else if (left + clientWidth > vw) {
    width = vw - left;
  }

  if (width != null) {
    el.style.maxWidth = `${width}px`;
  }
}

SwiftUI ScrollView won't center content with GeometryReader

Move GeometryReader outside of VStack:

struct ChartView: View {
    var body: some View {
        GeometryReader { geo in
            VStack(alignment: .center) {
                ScrollView(.horizontal, showsIndicators: false) {
                    HStack {
                       ForEach(0..<self.chartSettings.getChartYears(), id:\.self) { index in
                           ColumnView()
                       }
                    }
                }
                .background(Color.gray)
                .frame(maxHeight: geo.size.height/2)

                //Chart Legend
                HStack{
                    Rectangle()
                        .frame(width: 10, height: 10)
                        .foregroundColor(Color.init(#colorLiteral(red: 0.4666666687, green: 0.7647058964, blue: 0.2666666806, alpha: 1)))
                    Text("First Value")
                        .font(.system(size: 12))

                    Rectangle()
                        .frame(width: 10, height: 10)
                        .foregroundColor(Color.init(#colorLiteral(red: 0.2263821661, green: 0.4659538441, blue: 0.08977641062, alpha: 1)))
                    Text("Second Value")
                        .font(.system(size: 12))
                }
            }
        }
    }
}

Note: horizontal scroll view content always start from left (it is not alignment). If you want just center HStack on screen - remove ScrollView.

HorizontalScrollView with centered elements

use the gravity attribute :

android:layout_gravity="center_horizontal"
EDIT : 03.30 :

I found it ! only had to set the gravity to the upper LinearLayout : all you need to do is add a little padding/margins to make the textviews more comfortable to read !

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <HorizontalScrollView
        android:id="@+id/horizontalScrollView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" >

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/TextView04"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuB" >
            </TextView>

            <TextView
                android:id="@+id/TextView03"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuB" >
            </TextView>

            <TextView
                android:id="@+id/TextView02"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuB" >
            </TextView>

            <TextView
                android:id="@+id/TextView01"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuB" >
            </TextView>

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuA" >
            </TextView>

            <TextView
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MenuB" >
            </TextView>
        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

keep me posted !

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