メモリワーニングになったらGameControllerオブジェクトのvoid MemoryWarning(string msg)へ通知してくれるプラグイン。

MemoryWarning.mm

//
//  MemoryWarning.mm
//
//  Created by tsubaki on 2013/08/16.
//
//
#import "iPhone_target_Prefix.pch"
#import "UnityAppController.h"

@interface MemoryWarning : UnityAppController
+(void)load;
@end

@implementation MemoryWarning
+(void)load
{
    extern const char* AppControllerClassName;
    AppControllerClassName = "MemoryWarning";
}

- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application
{
    [super applicationDidReceiveMemoryWarning:application];
    UnitySendMessage("GameController", "MemoryWarning", "user=san, tsukaisugi!!!ba-ka!!!");
}

@end