Unity: Auto increment iOS build number post build

PostBuildHelper.cs

using System.IO;
using System.Linq;
using UnityEditor;
using UnityEditor.Callbacks;
using UnityEditor.iOS.Xcode;
using UnityEngine;

public static class PostBuildHelper
{
	[PostProcessBuild]
	public static void OnBuildComplete(BuildTarget buildTarget, string pathToBuiltProject)
	{
		if (buildTarget != BuildTarget.iOS)
		{
			return;
		}

		IncrementBuildNumber();
	}

	private static void IncrementBuildNumber()
	{
		// Load the PlayerSettings asset.
		var playerSettings = Resources.FindObjectsOfTypeAll<PlayerSettings>().FirstOrDefault();

		if (playerSettings != null)
		{
			SerializedObject so = new SerializedObject(playerSettings);

			// Find the build number property.
			var sp = so.FindProperty("iPhoneBuildNumber");

			var currentValue = sp.stringValue;
			int ver = 0;

			if (int.TryParse(currentValue, out ver))
			{
				// Increment version.
				sp.stringValue = (ver + 1).ToString();

				// Save player settings.
				so.ApplyModifiedProperties();
				AssetDatabase.SaveAssets();
			}
		}
	}
}