【Unity】Unity内だけで簡単にIDFAのトラッキング許可を取得する方法

UnityからWindow>Package Managerを選択
そして、Unity RegistryからiOS 14 Advertising Supportを探し『Install』を選択

SamplesのImportを選択

インポートするとAssetフォルダにSamplesが作成されます。

Asset>Samples>iOS 14 Advertising Support>1.0.0>01 Context Screen>Prefabs>Context Screen.prefabを選択し、IDFAの説明を表示したいシーンにドラッグ＆ドロップする

タイトルや説明文が英語なので日本語にする
画像は英語を翻訳したものを掲載

Example.csというスクリプトを作成し、以下の内容を入力

using System.Collections;
using Unity.Advertisement.IosSupport;
using UnityEngine;
#if UNITY_IOS
using UnityEngine.iOS;
#endif
public sealed class Example : MonoBehaviour
{
    public GameObject ATT;
#if UNITY_IOS
    private void Start()
    {
        // まだ許可ダイアログを表示したことがない場合
        if (ATTrackingStatusBinding.GetAuthorizationTrackingStatus() == ATTrackingStatusBinding.AuthorizationTrackingStatus.NOT_DETERMINED)
        {
            // 許可ダイアログを表示します
            ATT.SetActive(true);
        }
    }
#endif
}

次にEventSystemを作成

作成したEventSystemにExample.csをドラッグ＆ドロップし、Example.csのATTにContext Screenをドラッグ＆ドロップ

最後に、Context Screenを非アクティブにする

AssetにEditorというフォルダーを作成
そのフォルダーの中にPostBuildStep.csというスクリプトを作成し、以下の内容を入力
※ポップアップダイアログの説明の所だけ各自変更してください

using UnityEditor;
using UnityEditor.Callbacks;
#if UNITY_IOS
using UnityEditor.iOS.Xcode;
#endif
using System.IO;
 
public class PostBuildStep {
    // Set the IDFA request description:
    const string k_TrackingDescription = "ポップアップダイアログの説明";
 
    [PostProcessBuild(0)]
    public static void OnPostProcessBuild(BuildTarget buildTarget, string pathToXcode) {
        if (buildTarget == BuildTarget.iOS) {
            AddPListValues(pathToXcode);
        }
    }
 
    // Implement a function to read and write values to the plist file:
    static void AddPListValues(string pathToXcode) {
        // Retrieve the plist file from the Xcode project directory:
        string plistPath = pathToXcode + "/Info.plist";
        PlistDocument plistObj = new PlistDocument();
 
 
        // Read the values from the plist file:
        plistObj.ReadFromString(File.ReadAllText(plistPath));
 
        // Set values from the root object:
        PlistElementDict plistRoot = plistObj.root;
 
        // Set the description key-value in the plist:
        plistRoot.SetString("NSUserTrackingUsageDescription", k_TrackingDescription);
 
        // Save changes to the plist:
        File.WriteAllText(plistPath, plistObj.WriteToString());
    }
}

Assets/Samples/iOS 14 Advertising Support/1.0.0/01 Context Screen/Scripts/ContextScreenView.csを開き以下のマーカー部分を追加してください。

using System;
using UnityEngine;

namespace Unity.Advertisement.IosSupport.Components
{
    /// <summary>
    /// This component controls an iOS App Tracking Transparency context screen.
    /// You should only have one of these in your app.
    /// </summary>
    public sealed class ContextScreenView : MonoBehaviour
    {
        /// <summary>
        /// This event will be invoked after the ContinueButton is clicked
        /// and after the tracking authorization request has been sent.
        /// It's a good idea to subscribe to this event so you can destroy
        /// this GameObject to free up memory after it's no longer needed.
        /// Once the tracking authorization request has been sent, there's no
        /// need for this popup again until the app is uninstalled and reinstalled.
        /// </summary>
        public event Action sentTrackingAuthorizationRequest;

        public void RequestAuthorizationTracking()
        {
#if UNITY_IOS
            Debug.Log("Unity iOS Support: Requesting iOS App Tracking Transparency native dialog.");

            ATTrackingStatusBinding.RequestAuthorizationTracking();

            sentTrackingAuthorizationRequest?.Invoke();
#else
            Debug.LogWarning("Unity iOS Support: Tried to request iOS App Tracking Transparency native dialog, " +
                             "but the current platform is not iOS.");
#endif
            gameObject.SetActive(false);
        }
    }
}