DisableBitCodeBuildProcessor.cs

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

public class DisableBitCodeBuildProcessor
{
    [PostProcessBuild(0)]
    public static void OnPostProcessBuild(BuildTarget buildTarget, string buildPath)
    {
        if (buildTarget != BuildTarget.iOS) return;

        var projectPath = PBXProject.GetPBXProjectPath(buildPath);
        var project = new PBXProject();
        project.ReadFromString(File.ReadAllText(projectPath));
        var targetGuid = project.GetUnityFrameworkTargetGuid();
        project.SetBuildProperty(targetGuid, "ENABLE_BITCODE", "NO");
        File.WriteAllText(projectPath, project.WriteToString());
    }
}