iOS如何在已堆叠的ViewController上调用presentViewController

我正在尝试将视图控制器推到已经推过的视图控制器上，如下所示。然而，不知何故，当我试图推送

newPersonViewController

时，这个新控制器没有被推送到堆栈上。我不知道为什么Xcode抱怨我试图添加一个不属于层次结构的新控制器。我是否错误地显示了

ABPeoplePickerViewController

？这就是为什么不能将

newPersonViewController

推送到堆栈上的原因吗

来自控制台的消息：

警告：尝试显示其视图不在窗口层次结构中的对象

守则：

- (void)addPerson
{
    ABNewPersonViewController *newPersonVC = [[ABNewPersonViewController alloc] init];
    newPersonVC.newPersonViewDelegate = self;
    UINavigationController *uiNav = [[UINavigationController alloc] initWithRootViewController:newPersonVC];

    [self presentViewController:uiNav animated:YES completion:nil];
}

- (void)showPeoplePicker
{
    ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
    picker.peoplePickerDelegate = self;

    [self presentViewController:picker animated:YES completion:nil];
    [picker.topViewController setEditing:YES];
    picker.topViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addPerson)];
    picker.topViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(peoplePickerCancel)];
}

---

问题是，

addPerson

试图从视图控制器（而不是当前控制器）以模态方式呈现。

self

（原始视图控制器）不是活动控制器。

ABPeoplePickerNavigationController

因此，首先，定义一个类属性来跟踪

选择器

：

@property (nonatomic, weak) ABPeoplePickerNavigationController *picker;

然后呢,

• 修改

  showPeoplePicker

  以设置该属性；及
• 修改

  addPerson

  以使用该属性：

因此：

---

问题的根源在于

addPerson

中存在

[self-presentViewController:…]

，因为

self

不是当前的视图控制器。只需将其更改为新属性，您就完成了！抱歉用编辑折磨你！嗨，罗布，非常感谢你！它正在工作。我也在考虑选择错误的活动视图控制器，但不知道如何修复它。之前我尝试过：

[self.presentingViewController presentViewController:uiNav动画：是完成：nil]和
[self.presentingViewController.navigationViewController presentViewController:uiNav动画：是完成：无]也是，但它不起作用。因此，我认为调用self.presentingViewController将为我提供当前显示的视图控制器。
- (void)addPerson
{
    ABNewPersonViewController *newPersonVC = [[ABNewPersonViewController alloc] init];
    newPersonVC.newPersonViewDelegate = self;
    UINavigationController *uiNav = [[UINavigationController alloc] initWithRootViewController:newPersonVC];

    [self.picker presentViewController:uiNav animated:YES completion:nil];
}

- (void)showPeoplePicker
{
    ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
    picker.peoplePickerDelegate = self;

    [self presentViewController:picker animated:YES completion:nil];
    [picker.topViewController setEditing:YES];
    picker.topViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd    target:self action:@selector(addPerson)];
    picker.topViewController.navigationItem.leftBarButtonItem  = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(peoplePickerCancel)];

    self.picker = picker;
}

- (void)newPersonViewController:(ABNewPersonViewController *)newPersonView didCompleteWithNewPerson:(ABRecordRef)person
{
    [newPersonView dismissViewControllerAnimated:YES completion:nil];
}