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我使用NSCollectionView以及Content Array（Legacy）佈局，因此我需要setContent:僅在通過NSLibraryGridItem子類和.xib文件構建集合視圖項目時更改集合視圖項目。但是，我的一些用戶在調用setContent:時收到崩潰，但很少。這是崩潰日誌：執行setContent時有時出現NSInternalInconsistencyException
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
objc[5520]: garbage collection is OFF
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[NSViewController loadView] could not load the "(null)" nib.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff843b4f56 __exceptionPreprocess 198
1 libobjc.A.dylib 0x00007fff895bfd5e objc_exception_throw 43
2 CoreFoundation 0x00007fff843b4d8a [NSException raise:format:arguments:] 106
3 CoreFoundation 0x00007fff843b4d14 [NSException raise:format:] 116
4 AppKit 0x00007fff8630b1b5 -[NSViewController loadView] 336
5 AppKit 0x00007fff86306dfe -[NSViewController view] 41
6 AppKit 0x00007fff8694c425 -[NSCollectionViewItem _copyConnectionsToItem:] 49
7 AppKit 0x00007fff8694c9d9 -[NSCollectionViewItem copyWithZone:] 541
8 CoreFoundation 0x00007fff8435cd54 -[NSObject copy] 20
9 AppKit 0x00007fff869560c7 -[NSCollectionView newItemForRepresentedObject:] 63
10 AppKit 0x00007fff8695047a -[NSCollectionView _getItemsToDisplay] 1406
11 AppKit 0x00007fff869568f4 -[NSCollectionView setContent:] 275
12 MyApp 0x00000001068a1879 _mh_execute_header 112761
13 libdispatch.dylib 0x00007fff89486a82 _dispatch_call_block_and_release 18
14 libdispatch.dylib 0x00007fff894888f2 _dispatch_main_queue_callback_4CF 308
15 CoreFoundation 0x00007fff84349e7c __CFRunLoopRun 1724
16 CoreFoundation 0x00007fff84349486 CFRunLoopRunSpecific 230
17 HIToolbox 0x00007fff89b172bf RunCurrentEventLoopInMode 277
18 HIToolbox 0x00007fff89b1e56d ReceiveNextEventCommon 355
19 HIToolbox 0x00007fff89b1e3fa BlockUntilNextEventMatchingListInMode 62
20 AppKit 0x00007fff861da779 _DPSNextEvent 659
21 AppKit 0x00007fff861da07d -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 135
22 AppKit 0x00007fff861d69b9 -[NSApplication run] 470
23 AppKit 0x00007fff86452eac NSApplicationMain 867
24 MyApp 0x0000000106887d38 _mh_execute_header 7480
25 ??? 0x0000000000000002 0x0 2
)
terminate called throwing an exception
abort() called
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff89fdfce2 __pthread_kill 10
1 libsystem_c.dylib 0x00007fff86e8e7d2 pthread_kill 95
2 libsystem_c.dylib 0x00007fff86e7fa7a abort 143
3 libc abi.dylib 0x00007fff8753c7bc abort_message 214
4 libc abi.dylib 0x00007fff87539fcf default_terminate() 28
5 libobjc.A.dylib 0x00007fff895c01b9 _objc_terminate 94
6 libc abi.dylib 0x00007fff8753a001 safe_handler_caller(void (*)()) 11
7 libc abi.dylib 0x00007fff8753a05c std::terminate() 16
8 libc abi.dylib 0x00007fff8753b152 __cxa_throw 114
9 libobjc.A.dylib 0x00007fff895bfe7a objc_exception_throw 327
10 com.apple.CoreFoundation 0x00007fff843b4d8a [NSException raise:format:arguments:] 106
11 com.apple.CoreFoundation 0x00007fff843b4d14 [NSException raise:format:] 116
12 com.apple.AppKit 0x00007fff8630b1b5 -[NSViewController loadView] 336
13 com.apple.AppKit 0x00007fff86306dfe -[NSViewController view] 41
14 com.apple.AppKit 0x00007fff8694c425 -[NSCollectionViewItem _copyConnectionsToItem:] 49
15 com.apple.AppKit 0x00007fff8694c9d9 -[NSCollectionViewItem copyWithZone:] 541
16 com.apple.CoreFoundation 0x00007fff8435cd54 -[NSObject copy] 20
17 com.apple.AppKit 0x00007fff869560c7 -[NSCollectionView newItemForRepresentedObject:] 63
18 com.apple.AppKit 0x00007fff8695047a -[NSCollectionView _getItemsToDisplay] 1406
19 com.apple.AppKit 0x00007fff869568f4 -[NSCollectionView setContent:] 275
20 MyApp 0x00000001068a1879 0x106886000 112761
21 libdispatch.dylib 0x00007fff89486a82 _dispatch_call_block_and_release 18
22 libdispatch.dylib 0x00007fff894888f2 _dispatch_main_queue_callback_4CF 308
23 com.apple.CoreFoundation 0x00007fff84349e7c __CFRunLoopRun 1724
24 com.apple.CoreFoundation 0x00007fff84349486 CFRunLoopRunSpecific 230
25 com.apple.HIToolbox 0x00007fff89b172bf RunCurrentEventLoopInMode 277
26 com.apple.HIToolbox 0x00007fff89b1e56d ReceiveNextEventCommon 355
27 com.apple.HIToolbox 0x00007fff89b1e3fa BlockUntilNextEventMatchingListInMode 62
28 com.apple.AppKit 0x00007fff861da779 _DPSNextEvent 659
29 com.apple.AppKit 0x00007fff861da07d -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 135
30 com.apple.AppKit 0x00007fff861d69b9 -[NSApplication run] 470
31 com.apple.AppKit 0x00007fff86452eac NSApplicationMain 867
32 MyApp 0x0000000106887d38 0x106886000 7480
與我的應用程序正常工作，並且所收到的崩潰只是做規律性的東西的用戶，這意味着有明顯導致崩潰沒有特殊情況，那我無法重現該錯誤。
重要信息：我的應用需要支持macOS 10.6，所以我只能使用支持該系統的解決方案。
EDIT（30/08/2017）：
的問題仍然沒有解決。我做了，爲了避免撞車，但我仍然不知道它的由來：
-(BOOL)safeSetContent:(NSArray*)newContent
{
@try
{
[self setContent:newContent];
[self setNeedsDisplay:YES];
return YES;
}
@catch (NSException* exception)
{
if (exception.name == NSInternalInconsistencyException)
{
[NSAlert showAlertOfType:NSAlertTypeError withMessage:@"An unexpected NSInternalInconsistencyException occured."];
return NO;
}
[NSAlert showAlertMessageWithException:exception];
return NO;
}
}
它說，我沒有在我的代碼任何部分使用NSViewController很重要（該項目在Mac OS X 10.6時代創建，並且它不是默認的）。
而這些調用safeSetContent:三個功能：
-(void)forceReloadTableContents
{
NSArray* contentArray = self.appsArray.tabType == DEFAULT_TYPE ? @[DEFAULT_VALUE] : nil;
[NSThread dispatchBlockInMainQueue:^
{
if ([self safeSetContent:contentArray])
{
[NSThread dispatchQueueWithName:THREAD_RELOAD_GRID_VIEW_AFTER_SAVE
priority:DISPATCH_QUEUE_PRIORITY_DEFAULT concurrent:NO withBlock:^
{
[self reloadTableContents];
}];
}
}];
}
-(void)reloadTableWithType:(NSInteger)type
{
[self safeSetContent:@[]];
if (type == DEFAULT_TYPE)
{
[NSThread detachNewThreadSelector:@selector(loadDefaultType) toTarget:self.libraryTabView withObject:nil];
}
else
{
[(NSLibraryTabView*)self.libraryTabView loadOtherType];
}
}
-(void)reloadTableContents
{
BOOL isServer = (self.appsArray.tabType == DEFAULT_TYPE);
NSMutableArray* contentArray = isServer ? [@[DEFAULT_VALUE] mutableCopy] : [@[] mutableCopy];
if (self.appsArray.array) [contentArray addObjectsFromArray:self.appsArray.array];
if (contentArray.count == 0) contentArray = nil;
[NSThread dispatchBlockInMainQueue:^
{
if ([self safeSetContent:contentArray])
{
[[NSNotificationCenter defaultCenter] postNotificationName:COLLECTION_VIEW_UPDATE_NOTIFICATION object:nil];
}
}];
}
我已經改變了一些變量的名稱。
這個bug在10.6到10.12的多個macOS版本中被觀察到。
我想這是我的NSCollectionViewItem子類的相關內容：
@implementation NSLibraryGridItem
-(NSDictionary*)representedDictionary
{
if (!self.representedObject) return nil;
return (NSDictionary*)[self.representedObject copy];
}
-(void)setRepresentedObject:(id)representedObject
{
[super setRepresentedObject:representedObject];
NSDictionary* info = self.representedDictionary;
if (info)
{
if ([info isKindOfClass:[NSDictionary class]])
{
// App logic
}
}
}
@end
而且NSLibraryGridItem被選爲與集合視圖awakeFromNib中的觀點：
self.collectionViewItem = [NSLibraryGridItem new];
[self setItemPrototype:self.collectionViewItem];
下面是所有這些重要的短語：'reason：' - [NSViewController loadView]無法加載「（null）」nib'。另外請注意，在沒有看到代碼的情況下診斷或修復幾乎是不可能的。我會尋找一個集合視圖嘗試獲取視圖控制器視圖的地方。 – danh
我想這也是一個重要的觀點：我的應用程序沒有與視圖控制器相關的代碼。是否有可能xib文件（技術上有一個nib文件）有時無法加載，這是導致問題的原因？ – vitormm
我將檢查我能夠顯示的代碼，但我無法顯示太多 – vitormm