我正在向主视图添加一个subview，但我无法将其从该View中删除。NextViewController*nextView=[[NextViewControlleralloc]init];nextView.transitioningDelegate=self;nextView.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;[self.presentedViewController.viewaddSubview:nextView.view];nextView.view.frame=CGRectMake(724,80,3