Unity3D访问变量通过Xcode设置

Question

我正在创建一个使用设备相机的应用程序。 我需要实现一个功能，检查用户是否允许应用程序访问设备相机，如果他们没有，使用相机的场景只显示黑屏。

因为Unity只支持webplayer平台中的Application.HasUserAuthorization，所以我需要在生成后通过XCode将授权检查添加到项目中。

首先我在UnityAppController.mm文件添加以下代码以didFinishLaunchingWithOptions：

// Determine camera access on iOS >= 7 
if ([AVCaptureDevice respondsToSelector:@selector(requestAccessForMediaType:completionHandler:)]) { 
    // Completion handler will be dispatched on a separate thread 
    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) { 
     if (YES == granted) { 
      // User granted access to the camera, continue with app launch 
      CameraIsAvailable = YES; 
      CameraCheckDone = YES; 
     } 
     else { 
      CameraIsAvailable = NO; 
      CameraCheckDone = YES; 

     } 

    }]; 
} 

else { 
    // iOS < 7 (camera access always OK) 
    CameraCheckDone = YES; 
    // Continue with app launch... 
} 

和follwoing代码applicationDidBecomeActive

while (!CameraCheckDone) { } 
    if(!CameraIsAvailable){ 
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Authorize Camera" 
                  message:@"Instructions go here" 
                  delegate:self 
                cancelButtonTitle:@"OK" 
                otherButtonTitles:nil]; 
     [alertView show]; 
     [alertView release]; 

    } 

结果是每运行该应用程序的时间会弹出一个窗口，指示用户启动相机ch正在进步，但他们仍然可以访问显示黑屏而不是相机视图的场景。

有没有什么办法可以从Unity内部访问CameraIsAvilable变量？

任何建议将不胜感激！ TIA！

Answer 1

我通过使用UnitySendMessage函数解决了这个问题。

首先我更新didFinishLaunchingWithOptions在UnityAppController.mm，这里是修改后的代码：

// Determine camera access on iOS >= 7 
if ([AVCaptureDevice respondsToSelector:@selector(requestAccessForMediaType:completionHandler:)]) { 
    // Completion handler will be dispatched on a separate thread 
    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) { 
     if (YES == granted) { 
      // User granted access to the camera, continue with app launch 
      CameraIsAvailable = YES; 
      CameraCheckDone = YES; 

// ADDED THE FOLLOWING LINE THAT SENDS VALUE "YES" WHEN CAMERA ALLOWED 
      UnitySendMessage("iOSManager", "cameraCheck", "YES"); 
     } 
     else { 
      CameraIsAvailable = NO; 
      CameraCheckDone = YES; 
// ADDED THE FOLLOWING LINE THAT SENDS VALUE "NO" WHEN CAMERA IS NOT ALLOWED 
      UnitySendMessage("iOSManager", "cameraCheck", "NO"); 

     } 

    }]; 
} 

else { 
    // iOS < 7 (camera access always OK) 
    CameraCheckDone = YES; 
    // Continue with app launch... 
} 

然后在Unity3D，我添加了一个名为 “iOSManager” 到的第一个场景游戏对象我游戏（注意：GameObject名称必须与UnitySendMessage函数的第一个参数相匹配）。

我创建了下面的脚本与cameraCheck（）函数（函数名的UnitySendMessage函数的第二个参数匹配）：

#if UNITY_IOS 
void cameraCheck(string value) 
{ 
    // DO SOMETHING WITH VALUE 
} 
#endif 

凡字符串“值”是从UnitySendMessage

发送的值

现在我可以在Unity3D中使用此值