ios - 模态视图中的导航 Controller

Question

目前，当点击一个按钮时，会出现一个 UIModalPresentationSheet。当它向上滑动时，我想在它的顶部添加一个导航栏。我尝试了很多东西，但似乎没有任何效果。这是我目前正在尝试的，它返回了这个错误。

    AthleteAdd *addAthlete = [self.storyboard instantiateViewControllerWithIdentifier:@"addAthlete"];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:addAthlete];
    //[self.navigationController pushViewController:addAthlete animated:YES];

    addAthlete.delegate = self;
    addAthlete.modalPresentationStyle = UIModalPresentationFormSheet;
  //  UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:addAthlete];
    [self presentViewController:navigationController animated:YES completion:nil];

但它以模态方式将其向上推，并且没有模态演示表形式。我怎样才能使导航 Controller 的大小正确？

Answer 1

尝试像这样更改您的代码:

    AthleteAdd *addAthlete = [self.storyboard instantiateViewControllerWithIdentifier:@"addAthlete"];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:addAthlete];

    addAthlete.delegate = self;
    navigationController.modalPresentationStyle = UIModalPresentationFormSheet;


    [self presentViewController:navigationController animated:YES completion:nil];

因为在这里，您尝试从自身呈现 addAthlete。所以你得到这个错误。