navigationController 小结

?//跳转到下一组controller

SelectLevelControllerView *_selectLevelControllerView=[[SelectLevelControllerView alloc] init];
???
??? [self.navigationController pushViewController:_selectLevelControllerView animated:NO];
???
??? [_selectLevelControllerView release];

//返回到顶级 controller

[self.navigationController popViewControllerAnimated:NO];