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You should call SDL_SetMainReady(), and then customize the QIOSApplicationDelegate like this, in your application code: /* Additional support for applications mixing Qt and SDL */ @interface QIOSApplicationDelegate : UIResponder <UIApplicationDelegate> @end extern "C" { void SDL_OnApplicationWillResignActive(); void SDL_OnApplicationDidEnterBackground(); void SDL_OnApplicationWillEnterForeground(); void SDL_OnApplicationDidBecomeActive(); } @interface QIOSApplicationDelegate (SDL) - (void)applicationWillResignActive:(UIApplication*)application; - (void)applicationDidEnterBackground:(UIApplication*)application; - (void)applicationWillEnterForeground:(UIApplication*)application; - (void)applicationDidBecomeActive:(UIApplication*)application; @end @implementation QIOSApplicationDelegate (SDL) - (void)applicationWillResignActive:(UIApplication*)application { SDL_OnApplicationWillResignActive(); } - (void)applicationDidEnterBackground:(UIApplication*)application { SDL_OnApplicationDidEnterBackground(); } - (void)applicationWillEnterForeground:(UIApplication*)application { SDL_OnApplicationWillEnterForeground(); } - (void)applicationDidBecomeActive:(UIApplication*)application { SDL_OnApplicationDidBecomeActive(); } @end // QIOSApplicationDelegate