Example of centre alignment using SLayout

ExampleTextView.cs

public class ExampleTextView {

    public bool alignCentre;

    // ... various fields, grab the SLayout as "layout" ...
    // populate this list
    List<SLayout> _wordLayouts;


    // Lays out the words and returns the size used.
    public Vector2 LayoutWords() {

        float maxLineWidth = 0;
        float fitWidth = layout.width;
        float maxWordsWidthPerLine = fitWidth - padding.horizontal;

		while(currentWordIdx < _wordLayouts.Count) {

			int numWordsOnLine = 0;

			// Calculate width of this line for alignment reasons
			float lineWidth = 0.0f;
			for(int lineWordIdx = currentWordIdx; lineWidth < maxWordsWidthPerLine && lineWordIdx < _wordLayouts.Count; lineWordIdx++) {
				float lineWordWidth = _wordLayouts[lineWordIdx].width;

				float lineWidthAfterNewWord = lineWidth + lineWordWidth;
				if( lineWordIdx > currentWordIdx ) lineWidthAfterNewWord += spaceWidth;
					
				// Does this word fit on the line?
				if (lineWidthAfterNewWord < maxWordsWidthPerLine) {
					lineWidth = lineWidthAfterNewWord;
					numWordsOnLine++;
				} 

				// Force the first word in if it's long, even if it doesn't fit
				else if (numWordsOnLine == 0) {
					numWordsOnLine++;
					break;
				} 

				// Run out of space
				else {
					break;
				}
			}

			if( lineWidth > maxLineWidth )
				maxLineWidth = lineWidth;

			float indentDueToAlign = alignCentre ? 0.5f * (fitWidth - lineWidth) : padding.left;

			float currX = indentDueToAlign;
			for(int i=0; i<numWordsOnLine; i++) {
				var wordLayout = _wordLayouts[currentWordIdx + i];
				float wordWidth = wordLayout.width;

                wordLayout.position = new Vector2(currX, currY);

				currX += spaceWidth + wordWidth;
			}

			// Next line
			currY += lineHeight;
            currentWordIdx += numWordsOnLine;
		}

        if( maxLineWidth > fitWidth ) maxLineWidth = fitWidth;

		return new Vector2(maxLineWidth + padding.horizontal, currY + padding.bottom);
    }
}