有时我的应用程序崩溃是因为视图在后台线程上被释放，但问题是我无法弄清楚它来自哪里。
以下是崩溃日志：
2016-11-28 12:21:44.753913 iCompta[3993:326592] -[NSView _registerWithBackdropView] should not be called off of the main thread. Invocation was here:(
0 AppKit 0x00007fff8f082779 -[NSView(NSInternal) _unregisterWithBackdropViewIfNeeded] + 404
1 AppKit 0x00007fff8f0995b6 -[NSView(NSInternal) _recursivelyNoteBackdropViewChanged] + 54
2 AppKit 0x00007fff8f099685 -[NSView(NSInternal) _recursivelyNoteBackdropViewChanged] + 261
3 AppKit 0x00007fff8f099685 -[NSView(NSInternal) _recursivelyNoteBackdropViewChanged] + 261
4 AppKit 0x00007fff8f099685 -[NSView(NSInternal) _recursivelyNoteBackdropViewChanged] + 261
5 AppKit 0x00007fff8f159fdd -[NSTableView _removeBackgroundView] + 194
6 AppKit 0x00007fff8f159f05 -[NSTableView viewWillMoveToSuperview:] + 65
7 AppKit 0x00007fff8f03b4cc -[NSView _setSuperview:] + 695
8 AppKit 0x00007fff8f1fddab -[NSTableView _setSuperview:] + 263
9 AppKit 0x00007fff8f041205 -[NSView removeFromSuperview] + 447
10 AppKit 0x00007fff8f3be133 -[NSOutlineView removeFromSuperview] + 56
11 AppKit 0x00007fff8f1627ec -[NSView removeFromSuperviewWithoutNeedingDisplay] + 38
12 AppKit 0x00007fff8f8d333e -[NSView _finalize] + 1008
13 AppKit 0x00007fff8f04ece3 -[NSView dealloc] + 350
14 AppKit 0x00007fff8f04eaf2 -[NSClipView dealloc] + 165
15 libobjc.A.dylib 0x00007fffa5e47e8d _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 781
16 Foundation 0x00007fff92fb3b9b -[_NSXPCConnectionExportedObjectTable releaseExportedObject:] + 350
17 libdispatch.dylib 0x0000000100c5d74d _dispatch_call_block_and_release + 12
18 libdispatch.dylib 0x0000000100c53fcc _dispatch_client_callout + 8
19 libdispatch.dylib 0x0000000100c6bb0b _dispatch_queue_serial_drain + 205
20 libdispatch.dylib 0x0000000100c5d4f1 _dispatch_queue_invoke + 1174
21 libdispatch.dylib 0x0000000100c56247 _dispatch_root_queue_drain + 671
22 libdispatch.dylib 0x0000000100c55f58 _dispatch_worker_thread3 + 114
23 libsystem_pthread.dylib 0x0000000100ccb8c2 _pthread_wqthread + 1299
24 libsystem_pthread.dylib 0x0000000100ccb39d start_wqthread + 13
)
崩溃线程的名称是NSFileCoordinate，所以它似乎与文件协调有关，但这对我没有多大帮助。有没有想过调试这个？
答案 0 :(得分：1)
最后，我经过多次调试后才能解决问题。在我的情况下，崩溃原点的视图是文档窗口的一部分，当你关闭文档时有时会发生崩溃。
当您关闭文档并进行修改时，会启动异步保存，我发现有时文档最终会在后台队列中释放，然后导向窗口，其中的视图也会在该后台队列中释放
所以我的解决方案是在我的文档的dealloc方法中对我的窗口的根视图进行强引用，并在1秒后在主队列上调度一个块以使该引用无效。这样我就可以确保在主线程上释放所有视图。