Terminating app due to uncaught exception ‘NSInvalidArgumentException’ unrecognized selector sent to instance Objective-C Singleton
我正在调试我们的应用程序中仍在使用的非常旧的代码，因为它在我们的应用程序中引起了崩溃。该错误与 Objective-C 相关：
崩溃：
Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[TrackService exit]: unrecognized selector sent to instance 0x281cb4380’
崩溃的代码：
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@implementation TrackService
+ (TrackService *)sharedService |
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/*
GCD Singleton */ #define DEFINE_SHARED_INSTANCE_USING_BLOCK(block) \\ #endif |
堆栈跟踪：
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2020–02–11 09:49:35.737492+0200 TestApp[79860:6925721] *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[TrackService exit]: unrecognized selector sent to instance 0x600001dc6380’
*** First throw call stack: ( 0 CoreFoundation 0x000000010ee3b1bb __exceptionPreprocess + 331 1 libobjc.A.dylib 0x000000010e3d9735 objc_exception_throw + 48 2 CoreFoundation 0x000000010ee59f44 –[NSObject(NSObject) doesNotRecognizeSelector:] + 132 3 CoreFoundation 0x000000010ee3fed6 ___forwarding___ + 1446 4 CoreFoundation 0x000000010ee41da8 _CF_forwarding_prep_0 + 120 5 TestApp 0x00000001029b6575 $s2017fromNavControllerSbSS_SDySSypGSgSo012UINavigationK0CSgtFySSSgcfU13_ + 165 6 TestApp 0x00000001029b663f $sSSSgIegg_So8NSStringCSgIeyBy_TR + 175 7 TestApp 0x000000010249decf –[TrackViewController exit:] + 1551 8 TestApp 0x000000010249e275 __36–[TrackViewController exit:]_block_invoke + 757 9 TestApp 0x000000010246834c –[TrackViewController pickAction:] + 220 10 UIKitCore 0x0000000115a2cecb –[UIApplication sendAction:to:from:forEvent:] + 83 11 UIKitCore 0x000000011516d95b __45–[_UIButtonBarTargetAction _invoke:forEvent:]_block_invoke + 154 12 UIKitCore 0x000000011516d894 –[_UIButtonBarTargetAction _invoke:forEvent:] + 152 13 UIKitCore 0x0000000115a2cecb –[UIApplication sendAction:to:from:forEvent:] + 83 14 UIKitCore 0x00000001154680bd –[UIControl sendAction:to:forEvent:] + 67 15 UIKitCore 0x00000001154683da –[UIControl _sendActionsForEvents:withEvent:] + 450 16 UIKitCore 0x000000011546731e –[UIControl touchesEnded:withEvent:] + 583 17 UIKitCore 0x0000000115a680a4 –[UIWindow _sendTouchesForEvent:] + 2729 18 UIKitCore 0x0000000115a697a0 –[UIWindow sendEvent:] + 4080 19 UIKitCore 0x0000000115a47394 –[UIApplication sendEvent:] + 352 20 UIKitCore 0x0000000115b1c5a9 __dispatchPreprocessedEventFromEventQueue + 3054 21 UIKitCore 0x0000000115b1f1cb __handleEventQueueInternal + 5948 22 CoreFoundation 0x000000010eda0721 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 23 CoreFoundation 0x000000010ed9ff93 __CFRunLoopDoSources0 + 243 24 CoreFoundation 0x000000010ed9a63f __CFRunLoopRun + 1263 25 CoreFoundation 0x000000010ed99e11 CFRunLoopRunSpecific + 625 26 GraphicsServices 0x00000001141fc1dd GSEventRunModal + 62 27 UIKitCore 0x0000000115a2b81d UIApplicationMain + 140 28 TestApp 0x000000010262672b main + 75 29 libdyld.dylib 0x0000000110ab5575 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException |
代码在这一行崩溃TrackService.shared().exit()
- 什么是退出()？
- exit 是 TrackService 中的一个 void 函数
- 对于 Objective-C 使用 [[TrackService shared] exit]
- 我在 Swift 中使用该函数
- 显示TrackService中exit方法写在哪里。
问题是没有实现 exit 函数，即使它是在 .h 文件中定义的。
我认为您需要将 return [[self alloc] init]; 更改为 return [[TrackService alloc] init];，但甚至可能重写它，使其不再使用#define，如下所示。
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+ (TrackService *)sharedService
{ static TrackService * t; static dispatch_once_t onceToken; dispatch_once ( & onceToken, ^ { t = [[TrackService alloc] init]; } ); return t; |
来源：https://www.codenong.com/60163884/
