Unity 调用IOS ATT授权弹窗（AppTrackingTransparency）前提 ios升级到14.5版本之

前提

ios升级到14.5版本之后，强制要求app授权AppTrackingTransparency。不然审核不通过。经过研究，成功接入了ATT弹窗，下面把接入步骤分享给大家。

调用步骤

创建一个.mm文件，里面写ios代码，然后放到unity工程的Plugin/iOS文件夹下。脚本内容：

#import <Foundation/Foundation.h>
#import <AppTrackingTransparency/AppTrackingTransparency.h>
#import "UnityInterface.h"

extern "C" {
     void _RequestTrackingAuthorizationWithCompletionHandler() {
         if (@available(iOS 14, *)) {
             [ATTrackingManager requestTrackingAuthorizationWithCompletionHandler:^(ATTrackingManagerAuthorizationStatus status) {
                 NSString *stringInt = [NSString stringWithFormat:@"%lu",(unsigned long)status];
                 const char* charStatus = [stringInt UTF8String];
                 UnitySendMessage("IOSMethod", "GetAuthorizationStatus", charStatus);
             }];
         } else {
             UnitySendMessage("IOSMethod", "GetAuthorizationStatus", "-1");
         }
     }
    
     int _GetAppTrackingAuthorizationStatus() {
         if (@available(iOS 14, *)) {
             return (int)[ATTrackingManager trackingAuthorizationStatus];
         } else {
             return -1;
         }
     }
}

创建一个名为ATTAuth的C#脚本，用于调用IOS代码，脚本内容如下：

    [DllImport("__Internal")]
    private static extern void _RequestTrackingAuthorizationWithCompletionHandler();

    [DllImport("__Internal")]
    private static extern int _GetAppTrackingAuthorizationStatus();
    
    private static Action<int> getAuthorizationStatusAction;
    
    /// <summary>
    /// 请求ATT授权窗口
    /// </summary>
    /// <param name="getResult"></param>
    public static void RequestTrackingAuthorizationWithCompletionHandler(Action<int> getResult)
    {
        //-1:"ios版本低于14"
        //0: "ATT 授权状态待定";
        //1: "ATT 授权状态受限";
        //2: "ATT 已拒绝";
        //3: "ATT 已授权";
        Debug.Log("RequestTrackingAuthorizationWithCompletionHandler");
        getAuthorizationStatusAction = getResult;
        _RequestTrackingAuthorizationWithCompletionHandler();
    }

    /// <summary>
    /// 获取当前ATT授权状态
    /// </summary>
    /// <returns></returns>
    public static int GetAppTrackingAuthorizationStatus()
    {
        return _GetAppTrackingAuthorizationStatus();
    }

    public void GetAuthorizationStatus(string status)
    {
        getAuthorizationStatusAction?.Invoke(int.Parse(status));
    }

在游戏场景中创建一个物体，取名为IOSMethod。把ATTAuth.cs脚本挂到该物体上。
在需要调用ATT弹窗的地方写下面的代码：

if (Application.platform == RuntimePlatform.IPhonePlayer)
{
    int curStatus = ATTAuth.GetAppTrackingAuthorizationStatus());
    if(curStatus == 0)
    {
        ATTAuth.RequestTrackingAuthorizationWithCompletionHandler((status) =>
        {
            Debug.Log("ATT status :" + status);
        });
    }
}

打包XCode工程，在MAIN TARGETS中添加AppTrackingTransparency.framework，如下图：

（步骤5也可以在脚本中完成，自行搜索 BuildIOSProcessor 打包后处理怎么使用，然后给MainTarget添加Framework即可： pbxProject.AddFrameworkToProject(unity_mian_targetGUID, "AppTrackingTransparency.framework", false);）

修改plist文件。用编辑器打开Info.plist文件添加NSUserTrackingUsageDescription字段：

<key>NSUserTrackingUsageDescription</key>
<string>描述文本</string>

或者直接在XCode中，选中Info.plist，点击+号，新增 Privacy - Tracking Usage Description