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];