* frame #0: 0x0000000100083c1e MyApp`___lldb_unnamed_symbol1640$$MyApp
frame #1: 0x00007ff815482b42 Foundation`__NSFireDelayedPerform + 440
frame #2: 0x00007ff814617f59 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
frame #3: 0x00007ff814617a48 CoreFoundation`__CFRunLoopDoTimer + 923
frame #4: 0x00007ff8146175b8 CoreFoundation`__CFRunLoopDoTimers + 307
frame #5: 0x00007ff8145fdcf6 CoreFoundation`__CFRunLoopRun + 2010
frame #6: 0x00007ff8145fce5c CoreFoundation`CFRunLoopRunSpecific + 562
frame #7: 0x00007ff81d2a45e6 HIToolbox`RunCurrentEventLoopInMode + 292
frame #8: 0x00007ff81d2a434a HIToolbox`ReceiveNextEventCommon + 594
frame #9: 0x00007ff81d2a40e5 HIToolbox`_BlockUntilNextEventMatchingListInModeWithFilter + 70
frame #10: 0x00007ff81703c1fd AppKit`_DPSNextEvent + 927
frame #11: 0x00007ff81703a8ba AppKit`-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1394
frame #12: 0x00007ff81702cf69 AppKit`-[NSApplication run] + 586
frame #13: 0x00007ff817000ee7 AppKit`NSApplicationMain + 817
frame #14: 0x000000010041551e dyld`start + 462
就只地址0x0000000100083c1e的调用，这个看起来像performSelector:withObject:afterDelay: 触发的，问题是怎么找到在哪里执行了performSelector:withObject:afterDelay:呢？这个调用堆栈里面除了0x0000000100083c1e 全是系统的，这是怎么回事啊？