按钮上的iOS6 UIViewControllerHierarchyInconsistency单击

Question

我在iOS 6 iPad中面临问题

1. 单击按钮 - >使用UITable打开popover
2. 在选择一行 - > modalviewcontroller打开.
3. 解雇modalviewcontroller(它工作正常)
4. 然后再次单击按钮,按钮单击时应用程序崩溃(第1步)

此问题仅适用于iOS 6.它在iOS 5,iOS 4.3中运行良好

*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'A view can only be associated with at most one view controller at a time! View <UITableView: 0xb847400; frame = (0 0; 185 104); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0xa469e50>; layer = <CALayer: 0xa469f00>; contentOffset: {0, 0}> is associated with <UIViewController: 0xa462f60>. Clear this association before associating this view with <UIViewController: 0xa5dac40>.'
*** First throw call stack:
(0x2769012 0x1d0be7e 0x2768deb 0xca1309 0xd385ac 0xd34a90 0x69b19 0x1d1f705 0xc56920 0xc568b8 0xd17671 0xd17bcf 0xd16d38 0xc8633f 0xc86552 0xc643aa 0xc55cf8 0x29a2df9 0x29a2ad0 0x26debf5 0x26de962 0x270fbb6 0x270ef44 0x270ee1b 0x29a17e3 0x29a1668 0xc5365c 0x24ca 0x23d5)
libc++abi.dylib: terminate called throwing an exception

添加代码

listTable.frame = CGRectMake(0, 0, listWidth, listItemHeight*[listArray count]-1);
UIViewController* popoverContent = [[UIViewController alloc] init];
popoverContent.view = listTable;
popoverContent.contentSizeForViewInPopover = CGSizeMake(listWidth, listItemHeight*[listArray count]);
listPopOver = [[UIPopoverController alloc] initWithContentViewController:popoverContent];
[listPopOver setDelegate:self];
[listPopOver setPopoverContentSize:listTable.frame.size];
[listPopOver presentPopoverFromRect:self.frame inView:self.superview permittedArrowDirections:arrowDirection animated:YES];
[listTable reloadData];
[popoverContent release];

Answer 1

更密切地检查您的异常:

'UIViewControllerHierarchyInconsistency', reason:
'A view can only be associated with at most one view controller at a time!
View UITableView: 0xb847400; frame = (0 0; 185 104); clipsToBounds = YES;
autoresize = W+H; gestureRecognizers = NSArray: 0xa469e50; layer = CALayer: 0xa469f00;
contentOffset: {0, 0} is associated with UIViewController: 0xa462f60.
Clear this association before associating this view with UIViewController: 0xa5dac40.'

特别:

A view can only be associated with at most one view controller at a time!
View UITableView: 0xb847400
is associated with
UIViewController: 0xa462f60. 
Clear this association before associating this view with 
UIViewController: 0xa5dac40.

这意味着你有一个视图控制器,它的.view属性被设置为你的listTable对象.然后,在不破坏该关联的情况下,您使用另一个视图控制器并尝试将其.view属性设置为listTable对象.这违反了视图层次结构规则,Apple在iOS 6.0中执行的规则越来越严重,现在它会引发异常并导致应用程序崩溃.

所以这里真正的问题是你正在使用具有两个视图控制器的相同listTable对象popoverContent.这意味着当您的代码第二次执行时,旧的popoverContent仍然存在,这就是为什么它在第二次运行而不是第一次运行时崩溃的原因.我猜想,在尝试创建新的popover之前,你的代码不会完全解除分配和销毁旧的popover; 如果你确定这种情况发生,你可能没事.

我还注意到,显然,你使用相同的listTable用于两个popovers.你是否想懒洋洋地为每个popover创建这个listTable而不是保持它？

如果您想进一步研究更多内容,可以在代码中设置断点并使用po命令打印不同视图和视图控制器的描述,以查看哪些十六进制地址与随后出现在您的异常中的地址相匹配,并获得更多有关问题的信息.或者,您甚至可以直接使用十六进制地址打印描述:po 0xa469e50例如(可能必须对其进行类型转换).

除此之外,你还没有为某人提供足够的代码来查看它并说明问题是什么:)但上述内容应该可以帮助你解决问题.