PBXProject.GetAllBuildPhasesForTarget

Возвращает все этапы построения для указанного конечного объекта.

Вы можете запросить тип и имя каждой фазы, используя GetBuildPhaseType и GetBuildPhaseName соответственно.

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

public class Sample_GetAllBuildPhasesForTarget  
{
    [PostProcessBuild]
    public static void OnPostprocessBuild(BuildTarget buildTarget, string pathToBuiltProject)
    {

        // Stop processing if build target is not iOS
        if (buildTarget != BuildTarget.iOS)
            return;

        // Initialize PBXProject
        string projectPath = PBXProject.GetPBXProjectPath(pathToBuiltProject);
        PBXProject pbxProject = new PBXProject();
        pbxProject.ReadFromFile(projectPath);

        // Get GUID of the target you want
        string mainTargetGuid = pbxProject.GetUnityMainTargetGuid();

        // Retrieve the GUIDs of all Build Phases for the target and print their types and names to the Console
        string[] buildPhases = pbxProject.GetAllBuildPhasesForTarget(mainTargetGuid);
        foreach (string phaseGuid in buildPhases)
        {
            string phaseName = pbxProject.GetBuildPhaseName(phaseGuid);
            string phaseType = pbxProject.GetBuildPhaseType(phaseGuid);
            Debug.Log(string.Format("Name: {0} | Type: {1}", phaseName, phaseType));
        }
    }
}