尝试呈现模态视图控制器时的UIViewControllerHierarchyInconsistency [英] UIViewControllerHierarchyInconsistency when trying to present a modal view controller

问题描述

尝试使用以下代码呈现模态视图控制器

Trying to present a modal view controller with the following code

MapViewController *mapView = [[MapViewController alloc] initWithNibName:@"MapViewController" bundle:nil];
    mapView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController presentModalViewController:mapView animated:YES];
    [mapView release];

继续收到以下错误..

Keep getting the following error..

'UIViewControllerHierarchyInconsistency', reason: 'A view can only be associated with at most one view controller at a time! View <UIView: 0x1ed815a0; frame = (0 20; 320 460); autoresize = W+H; layer = <CALayer: 0x1ed81600>> is associated with <UIViewController: 0x1ed835a0>. Clear this association before associating this view with <MapViewController: 0x1dd947c0>.'

这是一个旧项目我几个月没碰过，想知道什么可能导致这样的错误？

This is an old project that I havent touched in months, wonder what could cause such an error?

推荐答案

在最新的Xcode版本中，我已经两次遇到过这种情况。
在这两种情况下我都需要对UIViewController的XIB文件进行更改（在这种情况下，它将是MapViewController.xib：

This happened to me already twice in the newest Xcode release. In both cases I needed to make changes to the UIViewController's XIB file (In you case it would be MapViewController.xib:

BEFORE：

1. 将主视图移出查看控制器的子项：


2. 从XIB中移除查看控制器（由于文件的所有者已经是其类，因此没有必要）：

1. Move main View out of View Controller's children:
2. Remove View Controller from the XIB (it is not necessary since File's Owner should be of its Class already):

之后：

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