iphone - self.navigationController == 无

Question

我尝试做一个简单的切换 View 功能但是没有用 然后我尝试查看是否分配了第二个 View 并且没问题。 问题是我的 self.navigationControler 是 nil 。 我该如何解决？

ViewController2 *hs=[self.storyboard instantiateViewControllerWithIdentifier:@"Highscore"];
if(self.navigationController==nil)
{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"YOur Message" message:@"Your description"
                                                   delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
    [alert show];
}


    [self.navigationController pushViewController:hs animated:YES]; 

Answer 1

您需要从 UINavigationController 中呈现当前 View Controller

UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:Your_Current_View_Controller];

//Now present controller in any way you want

在那之后你的 self.navigationController 将不再是 nil