Qt within Objective-C

main.mm

- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  NSProcessInfo *procInfo = [NSProcessInfo processInfo];
  NSArray *arguments = [procInfo arguments];
  int argc = arguments.count;
  // we need a strong reference for the
  // argv because it is required to stay
  // valid as long as the QGuiApplication instance
  // is valid
  _argv = (char**)malloc(sizeof(char*) * argc);
  for (int i = 0; i < argc; ++i) {
    NSString *arg = [arguments objectAtIndex:i];
    _argv[i] = (char *)(malloc([arg lengthOfBytesUsingEncoding:[NSString defaultCStringEncoding]]));
    strcpy(_argv[i], [arg cStringUsingEncoding:[NSString defaultCStringEncoding]]);
  }

  // make sure you keep a strong reference
  // to the QGuiApplication instance.
  // you can later free it inside the
  // - (void)applicationWillTerminate:(UIApplication *)application
  // delegate method
  _qApp = new QGuiApplication(argc, _argv);
  return YES;
}