storyboard self.navigationController.pushViewController 新的界面黑屏

在storyboard建好viewController后，用以下方法打开DetailZhenViewController，页面会变为黑屏
DetailZhenViewController *detailZhen=[[DetailZhenViewController alloc]init];
[self.navigationController pushViewController:detailZhen animated:YES];

解决：
1、首先在
DetailZhenViewController的stroyboard中指定StoryBoard Id，如：detailZhen

2、代码修改为
DetailZhenViewController *detailZhen=[self.storyboard instantiateViewControllerWithIdentifier:@“YiJiAdviseViewController”]；
[self.navigationController pushViewController:detailZhen animated:YES];

用故事板的初始化方法创建viewController