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1) en el viewcontroller que se va a llamar añadir el método preferredContentSize

-(CGSize)preferredContentSize{
	
	return CGSizeMake(420, 240);
}


2) en la llamada
			
				modalViewController.view.frame = frame;
				modalViewController.preferredContentSize =CGSizeMake(frame.size.width, frame.size.height);
				

				[self presentViewController:modalViewController animated:NO completion:^{
					
				self.presentedViewController.view.superview.frame = frame;
				[self.presentedViewController.view.superview setCenter:center];

				}];