Unity 2019.3 以降でiOSプロジェクトにAPNS関連のCapabilityを追加する

XcodeProjectUpdater.cs

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

// Unity 2019.3 でGetUnityTargetNameがdeprecatedになってるので。
public class MyBuildPostprocessor {
	[PostProcessBuild]
	public static void OnPostprocessBuild(BuildTarget buildTarget, string path) {
		string appName = "<YOUR-APP-NAME>";
		string targetName = "Unity-iPhone";
		const string entitlements = @"
<?xml version=""1.0"" encoding=""UTF-8\""?>
<!DOCTYPE plist PUBLIC ""-//Apple//DTD PLIST 1.0//EN"" ""http://www.apple.com/DTDs/PropertyList-1.0.dtd"">
<plist version=""1.0"">
    <dict>
        <key>aps-environment</key>
        <string>development</string>
    </dict>
</plist>";
		if (buildTarget != BuildTarget.iOS) {
			return;
		}
		try {
		    PBXProject proj = new PBXProject();
		    string projPath = PBXProject.GetPBXProjectPath(path);
		    string entitlementFileName = appName + ".entitlements";
		    string entitlementPath = path + "/" + targetName + "/" + entitlementFileName;

		    // 1. PBXProject初期化
		    proj.ReadFromFile(projPath);
		    string target = proj.GetUnityMainTargetGuid();

		    // 2. entitlementsファイルを作成する
		    File.WriteAllText(entitlementPath, entitlements);
		    proj.AddFile(targetName + "/" + entitlementFileName, entitlementFileName);
		    proj.AddBuildProperty(target, "CODE_SIGN_ENTITLEMENTS", targetName + "/" + entitlementFileName);
		    // 3. Linked Frameworks and LibrariesにUserNotifiations.frameworkを追加
		    proj.AddFrameworkToProject(target, "UserNotifications.framework", false);
		    // 4. CapabilitiesにBackground Modes -> Remote notificaionsを追加
		    ProjectCapabilityManager capManager = new ProjectCapabilityManager(projPath, targetName + "/" + entitlementFileName, targetName);
		    proj.AddCapability(target, PBXCapabilityType.BackgroundModes);
		    capManager.AddBackgroundModes(BackgroundModesOptions.RemoteNotifications);
		    // 5. 書き出し
		    capManager.WriteToFile();
		    proj.WriteToFile(projPath);
		} catch (Exception e) {
		    Debug.Log($"PostProcessBuild Error {e}");
		}
	}
}