ios - 推送 UINavigationController

Question

我在推送 View Controller 时遇到问题。这就是我所做的:单击一个按钮，我使用这段代码添加了一个模态视图，我工作正常:

- (void)addAction:(id)sender
{
    uipickerForContract *addViewController = [[uipickerForContract alloc] initWithNibName:@"uipickerForContract" bundle:nil];
    addViewController.delegate = self;

    addViewController.modalPresentationStyle = UIModalPresentationFormSheet;
    addViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

    [self presentModalViewController:addViewController animated:YES];

    addViewController.view.superview.frame = CGRectMake(50, 740, 695, 245);


}

这个添加的 viewcontroller 包含一个完成按钮，我想使用它来导航到其他 viewcontroller:所以我使用该代码但它没有用，它只是关闭了 addeview:

 donebutton{

    nextview*s = [[nextview alloc]initWithNibName:@"nextview" bundle:nil];
    s.view.frame = CGRectMake(10, 20, 745, 755);
    //nextview contains the object that I want to pass :object
        s.object= self;
        UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:self];
    [self dismissModalViewControllerAnimated:YES];
         [self.navigationController pushViewController:s animated:YES];
        NSLog(@"self.nav%@",self.navigationController);
     }

Answer 1

View Controller 的 self.navigationController(您以模态方式呈现)将为零

而且你无法注意到这个东西，因为你正在分配导航 Controller 对象。