1.用UINavigationController的时候用pushViewController:animated
----返回之前的视图[[self navigationController] popViewControllerAnimated:YES];
---ps:push以后会在navigation的left bar自动添加back按钮,它的响应方法就是返回。所以一般不需要写返回方法,点back按钮即可。
2.其他时候用presentModalViewController:animated
[self presentModalViewController:controller animated:YES];//YES有动画效果
-----返回之前的视图 [self dismissModalViewControllerAnimated:YES];