iOS 7.1崩溃：-[UINavigationBar setItems:UINavigationBar：]

Question

我正在经历一个全新的崩溃，在所有iPhone设备上使用iOS 7.1，我想知道其他人是否也看到了同样的情况。

Date/Time:           2014-03-11 11:46:00.795 -0700
OS Version:          iOS 7.1 (11D167)
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread:  6

Last Exception Backtrace:
0   CoreFoundation                       0x2d4dbefe __exceptionPreprocess + 126
1   libobjc.A.dylib                      0x37c70ce2 objc_exception_throw + 32
2   CoreFoundation                       0x2d4dbe40 +[NSException raise:format:] + 106
3   UIKit                                0x2fe319a0 -[UINavigationBar setItems:animated:] + 98
4   Document                             0x97aa6 -[FHHorizontalSplitViewController setVisibility:animated:] (FHHorizontalSplitViewController.m:233)
5   Document                             0x98882 __44-[FHHorizontalSplitViewReplaceSegue perform]_block_invoke (FHHorizontalSplitViewController.m:450)
6   Document                             0x9814a __72-[FHHorizontalSplitViewController _changeViewFramesAnimated:completion:]_block_invoke (FHHorizontalSplitViewController.m:335)
7   UIKit                                0x2fd43788 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 278
8   UIKit                                0x2fd433d2 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 172
9   UIKit                                0x2fd432ea -[UIViewAnimationState animationDidStop:finished:] + 60
10  QuartzCore                           0x2f98de06 CA::Layer::run_animation_callbacks(void*) + 228
11  libdispatch.dylib                    0x38159d3a _dispatch_client_callout + 16
12  libdispatch.dylib                    0x3815c6be _dispatch_main_queue_callback_4CF + 272
13  CoreFoundation                       0x2d4a6674 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 2
14  CoreFoundation                       0x2d4a4f40 __CFRunLoopRun + 1302
15  CoreFoundation                       0x2d40f7a4 CFRunLoopRunSpecific + 518
16  CoreFoundation                       0x2d40f586 CFRunLoopRunInMode + 100
17  GraphicsServices                     0x3237c6ce GSEventRunModal + 132
18  UIKit                                0x2fd6e88c UIApplicationMain + 1130
19  Document                             0x80dbe main (main.m:12)

所讨论的代码(FHHorizontalSplitViewController)是安装在UINavigationController中的自定义UIViewController容器。其要点是将iPhone屏幕的上半部分和下半部分分割开来，并在上半部分中选择扩展或缩小下半部分。当子视图控制器被展开以填充屏幕时，容器向它请求它的UINavigationItem并设置导航栏项。

有趣的是，这种崩溃在iOS 7.1上是新的；它在6.x和7.0.x上运行得很好。

还有其他人在这个方法调用中看到了新的崩溃，这是以前没有发生过的？

崩溃的呼叫站点：

UINavigationController *navVC = self.navigationController;
if (navVC) {
    NSMutableArray *navigationItems = [NSMutableArray arrayWithArray:navVC.navigationBar.items;
    NSInteger lastItem = [navigationItems count] - 1;
    navigationItems[lastItem] = [self navigationItem];
    [navVC.navigationBar setItems:navigationItems animated:YES];
}

Answer 1

在-[UINavigationBar setItem:animated:] 7.1中不允许在由UINavigationController管理的导航栏上调用iOS