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[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
/**************添加并建立父子关系********************/
FirstViewController *firstViewController=[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
[self addChildViewController:firstViewController];
/////将控制器的视图添加到view上
[self.view addSubview:firstViewController.view];
//////建立逻辑上的父子关系
[firstViewController didMoveToParentViewController:self];
/**************从父视图中移除********************/
[firstViewController willMoveToParentViewController:nil];
[firstViewController removeFromSuperview];
[firstViewController removeFromParentViewController];
可以参考这篇文章:http://www.cnblogs.com/zengyou/p/3386605.html