Objective c 在后台线程上取消分配视图:如何调试?
有时我的应用程序崩溃是因为一个视图在后台线程上被释放,但问题是我不知道它来自哪里 以下是崩溃日志:Objective c 在后台线程上取消分配视图:如何调试?,objective-c,macos,Objective C,Macos,有时我的应用程序崩溃是因为一个视图在后台线程上被释放,但问题是我不知道它来自哪里 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 0x00007ff
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,因此它似乎与文件协调有关,但这对我帮助不大。有没有调试这个的想法?经过多次调试,我终于解决了这个问题。在我的例子中,崩溃起源处的视图是文档窗口的一部分,在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,我发现有时候文档最终会在后台队列中释放,然后导致窗口及其内部的视图也在后台队列中释放
因此,我的解决方案是在文档的dealoc方法中保留对窗口根视图的强引用,并在1秒后在主队列上调度一个块以使该引用无效。通过这种方式,我可以确保在主线程上解除分配所有视图。该视图是一个
NSOutlineView
,您是删除一个视图还是关闭包含一个视图的窗口?它是带绑定的大纲视图吗?覆盖该大纲视图的removeFromSuperview,并检查[NSThread isMainThread]是否返回false。可能是由另一个线程中的绑定触发的和更新。@Willeke Yes当它发生时,总是在关闭主文档窗口之后。我认为它与绑定无关,因为我的大纲视图正在使用数据源。您是否使用NSXPCConnection
?