关于 ios:Terminating app due to uncaught exception //’NSInvalidArgumentException//’ unrecognized selector sent to instance Objective-C Singleton

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
{
DEFINE_SHARED_INSTANCE_USING_BLOCK(^{
return [[self alloc] init];
});
}

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/*
GCD Singleton
*/

#define DEFINE_SHARED_INSTANCE_USING_BLOCK(block) //
static dispatch_once_t pred = 0; //
__strong static id _sharedObject = nil; //
dispatch_once(&pred, ^{ //
_sharedObject = block(); //
}); //
//
return _sharedObject;

#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()

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;
}

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/268701.html

关于 ios:Terminating app due to uncaught exception //’NSInvalidArgumentException//’ unrecognized selector sent to instance Objective-C Singleton

Terminating app due to uncaught exception ‘NSInvalidArgumentException’ unrecognized selector sent to instance Objective-C Singleton

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