由于EXC_CRASH（SIGABRT）异常，我最近收到了拒绝应用。 异常是从try-catch块中抛出的。
所以我有两个主要问题：
目标c中的try-catch子句是否捕获所有异常？
我在符号化的崩溃日志下面。在线程7（崩溃的那个）上我试着写一个NSMutableDictionary。同样的字典也在其他线程上使用（修改）。这可能是造成这次事故的原因吗？ （也许2个线程试图一次修改字典）。如果是这样，为什么不是第二个线程试图在崩溃日志中做同样的事情？另外：@synchronize（用于识别该变量的NSString）{更改我的NSMutableDictionary /从我的NSMutableDictionary读取}解决了我的问题？
感谢。
符号化崩溃日志：
Incident Identifier: 1A82F42E-59AA-499A-8C1D-CE744808F566
CrashReporter Key: 4f2c8fa05c83e9d455c232dbd2fa63e852283d0e
Hardware Model: xxx
Version: 1.0 (1.0)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
OS Version: iOS 7.1 (11D167)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 7
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x0000000191179ca0 mach_msg_trap + 8
1 CoreFoundation 0x000000018408a570 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000184088764 __CFRunLoopRun + 932
3 CoreFoundation 0x0000000183fc96cc CFRunLoopRunSpecific + 448
4 GraphicsServices 0x0000000189c65c08 GSEventRunModal + 164
5 UIKit 0x00000001870fafd8 UIApplicationMain + 1152
6 brandnooz 0x00000001000df500 main (main.m:16)
7 libdyld.dylib 0x0000000191097a9c start + 0
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x0000000191179aa8 kevent64 + 8
1 libdispatch.dylib 0x000000019107d998 _dispatch_mgr_thread + 48
Thread 2:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 3 name: Dispatch queue: com.apple.root.default-priority
Thread 3:
0 libsystem_kernel.dylib 0x0000000191179cdc semaphore_wait_trap + 8
1 brandnooz 0x000000010006fe9c __41-[RequestsViewController waitForRequests]_block_invoke (RequestsViewController.m:79)
2 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
3 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
4 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
5 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
6 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
7 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 4:
0 libsystem_kernel.dylib 0x0000000191179ca0 mach_msg_trap + 8
1 CoreFoundation 0x000000018408a570 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000184088700 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000183fc96cc CFRunLoopRunSpecific + 448
4 Foundation 0x0000000184b652c0 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 292
5 Foundation 0x0000000184bc2d74 -[NSRunLoop(NSRunLoop) run] + 92
6 brandnooz 0x0000000100115ed8 +[GAI threadMain:] + 68
7 Foundation 0x0000000184c4c408 __NSThread__main__ + 996
8 libsystem_pthread.dylib 0x0000000191213e18 _pthread_body + 164
9 libsystem_pthread.dylib 0x0000000191213d70 _pthread_start + 136
10 libsystem_pthread.dylib 0x0000000191211550 thread_start + 0
Thread 5 name: Dispatch queue: com.apple.root.default-priority
Thread 5:
0 libsystem_kernel.dylib 0x0000000191192448 __psynch_rw_rdlock + 8
1 libobjc.A.dylib 0x0000000190aaab84 lookUpImpOrForward + 164
2 libobjc.A.dylib 0x0000000190ab43f8 _objc_msgSend_uncached_impcache + 56
3 brandnooz 0x00000001000a14f8 -[AFHTTPRequestOperation hasAcceptableStatusCode] (AFHTTPRequestOperation.m:203)
4 brandnooz 0x00000001000a0710 -[AFHTTPRequestOperation error] (AFHTTPRequestOperation.m:137)
5 brandnooz 0x00000001000ebed8 -[AFJSONRequestOperation error] (AFJSONRequestOperation.m:99)
6 brandnooz 0x00000001000ec128 __64-[AFJSONRequestOperation setCompletionBlockWithSuccess:failure:]_block_invoke (AFJSONRequestOperation.m:121)
7 brandnooz 0x0000000100075a20 __47-[AFURLConnectionOperation setCompletionBlock:]_block_invoke (AFURLConnectionOperation.m:321)
8 Foundation 0x0000000184c34168 __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke96 + 24
9 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
10 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
11 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
12 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
13 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
14 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 6 name: Dispatch queue: com.apple.root.high-priority
Thread 6:
0 libsystem_kernel.dylib 0x0000000191192394 __psynch_cvwait + 8
1 Foundation 0x0000000184c338e0 -[__NSOperationInternal _waitUntilFinished:] + 100
2 brandnooz 0x00000001000b71f0 -[ApiConnection get:] (ApiConnection.m:152)
3 brandnooz 0x0000000100104b2c __38-[ApiRequests getTranslationsForCode:]_block_invoke (ApiRequests.m:185)
4 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
5 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
6 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
7 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
8 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
9 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 7 name: Dispatch queue: com.apple.root.high-priority
Thread 7 Crashed:
0 libsystem_kernel.dylib 0x000000019119258c __pthread_kill + 8
1 libsystem_c.dylib 0x0000000191126804 abort + 108
2 libsystem_malloc.dylib 0x00000001911cc5c0 nanozone_error + 292
3 libsystem_malloc.dylib 0x00000001911cbd5c nano_free_definite_size + 128
4 CoreFoundation 0x00000001840ca268 __rehashd + 236
5 CoreFoundation 0x0000000183fd1814 -[__NSDictionaryM setObject:forKey:] + 648
6 brandnooz 0x0000000100103f84 __22-[ApiRequests getFaq:]_block_invoke (ApiRequests.m:120)
7 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
8 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
9 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
10 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
11 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
12 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 8 name: Dispatch queue: com.apple.root.high-priority
Thread 8:
0 libsystem_kernel.dylib 0x0000000191192394 __psynch_cvwait + 8
1 Foundation 0x0000000184c338e0 -[__NSOperationInternal _waitUntilFinished:] + 100
2 brandnooz 0x00000001000b71f0 -[ApiConnection get:] (ApiConnection.m:152)
3 brandnooz 0x00000001001038e8 __24-[ApiRequests getTerms:]_block_invoke (ApiRequests.m:84)
4 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
5 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
6 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
7 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
8 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
9 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 9:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 10 name: Dispatch queue: com.apple.root.high-priority
Thread 10:
0 libsystem_kernel.dylib 0x0000000191192394 __psynch_cvwait + 8
1 Foundation 0x0000000184c338e0 -[__NSOperationInternal _waitUntilFinished:] + 100
2 brandnooz 0x00000001000b71f0 -[ApiConnection get:] (ApiConnection.m:152)
3 brandnooz 0x00000001001060b4 __46-[ApiRequests getProductsWithKickbackForCache]_block_invoke (ApiRequests.m:307)
4 libdispatch.dylib 0x000000019107c010 _dispatch_call_block_and_release + 20
5 libdispatch.dylib 0x000000019107bfd0 _dispatch_client_callout + 12
6 libdispatch.dylib 0x00000001910832b4 _dispatch_root_queue_drain + 552
7 libdispatch.dylib 0x00000001910834f8 _dispatch_worker_thread2 + 72
8 libsystem_pthread.dylib 0x00000001912116b8 _pthread_wqthread + 352
9 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 11:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 12 name: AFNetworking
Thread 12:
0 libsystem_platform.dylib 0x000000019120cdc8 _platform_memmove + 40
1 CoreFoundation 0x0000000183fe205c dataWrite + 176
2 CoreFoundation 0x0000000183fe1dc8 CFWriteStreamWrite + 440
3 brandnooz 0x0000000100077e3c -[AFURLConnectionOperation connection:didReceiveData:] (AFURLConnectionOperation.m:797)
4 Foundation 0x0000000184b82894 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 76
5 Foundation 0x0000000184b82780 -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 228
6 Foundation 0x0000000184b82678 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 76
7 Foundation 0x0000000184b82a7c _NSURLConnectionDidReceiveData + 76
8 CFNetwork 0x0000000183caf320 ___ZN27URLConnectionClient_Classic23_delegate_cacheTrifectaEPK20_CFCachedURLResponseU13block_pointerFvvE_block_invoke + 428
9 CFNetwork 0x0000000183cab6e0 ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 92
10 CoreFoundation 0x0000000183fc908c CFArrayApplyFunction + 64
11 CFNetwork 0x0000000183c20be8 RunloopBlockContext::perform() + 132
12 CFNetwork 0x0000000183c20a64 MultiplexerSource::perform() + 284
13 CFNetwork 0x0000000183c208a0 MultiplexerSource::_perform(void*) + 56
14 CoreFoundation 0x000000018408b040 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 20
15 CoreFoundation 0x000000018408a39c __CFRunLoopDoSources0 + 252
16 CoreFoundation 0x0000000184088634 __CFRunLoopRun + 628
17 CoreFoundation 0x0000000183fc96cc CFRunLoopRunSpecific + 448
18 Foundation 0x0000000184b652c0 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 292
19 Foundation 0x0000000184bc2d74 -[NSRunLoop(NSRunLoop) run] + 92
20 brandnooz 0x000000010007533c +[AFURLConnectionOperation networkRequestThreadEntryPoint:] (AFURLConnectionOperation.m:193)
21 Foundation 0x0000000184c4c408 __NSThread__main__ + 996
22 libsystem_pthread.dylib 0x0000000191213e18 _pthread_body + 164
23 libsystem_pthread.dylib 0x0000000191213d70 _pthread_start + 136
24 libsystem_pthread.dylib 0x0000000191211550 thread_start + 0
Thread 13 name: com.apple.NSURLConnectionLoader
Thread 13:
0 libsystem_malloc.dylib 0x00000001911bf020 free + 72
1 CoreFoundation 0x0000000184088b38 __CFRunLoopRun + 1912
2 CoreFoundation 0x0000000183fc96cc CFRunLoopRunSpecific + 448
3 Foundation 0x0000000184bbe424 +[NSURLConnection(Loader) _resourceLoadLoop:] + 344
4 Foundation 0x0000000184c4c408 __NSThread__main__ + 996
5 libsystem_pthread.dylib 0x0000000191213e18 _pthread_body + 164
6 libsystem_pthread.dylib 0x0000000191213d70 _pthread_start + 136
7 libsystem_pthread.dylib 0x0000000191211550 thread_start + 0
Thread 14:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 15:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 16:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 17:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 18:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 19:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 20:
0 libsystem_kernel.dylib 0x0000000191192e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191211548 start_wqthread + 0
Thread 21 name: com.apple.CFSocket.private
Thread 21:
0 libsystem_kernel.dylib 0x000000019119276c __select + 8
1 libsystem_pthread.dylib 0x0000000191213e18 _pthread_body + 164
2 libsystem_pthread.dylib 0x0000000191213d70 _pthread_start + 136
3 libsystem_pthread.dylib 0x0000000191211550 thread_start + 0
Thread 7 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x00676f6c7379732f x7: 0x0000000000000110
x8: 0x000000000c000000 x9: 0x0000000004000000 x10: 0x000000000000000a x11: 0x0000000000000007
x12: 0x0000000000000037 x13: 0x00000001001814dc x14: 0x0000000000000071 x15: 0x0000000004060401
x16: 0x0000000000000148 x17: 0x0000000001030301 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x0000000103180000 x21: 0x0000000100258000 x22: 0x00000001911d3053 x23: 0x0000000178037e20
x24: 0x0000000000000000 x25: 0x00000001914e4000 x26: 0x00000001914e4000 x27: 0x0000000000000003
x28: 0x0000000000000003 fp: 0x000000010317fc50 lr: 0x000000019121516c
sp: 0x000000010317fc30 pc: 0x000000019119258c cpsr: 0x00000000
代码示例：
-(void) getFaq:(NSString*)ln
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[self.isDone setObject:dispatch_group_create() forKey:TAG_GET_FAQ];
dispatch_group_async(self.isDone[TAG_GET_FAQ],dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
@try
{
ApiConnection* apiConnection = [[ApiConnection alloc] init];
NSString* apiPath = [TAG_API_PATH_GET_FAQ stringByReplacingOccurrencesOfString:@"LANGUAGE" withString:ln];
id JSON=[apiConnection get:apiPath];
[self.responses setObject:JSON forKey:TAG_GET_FAQ]; // <-- crash
[self.processedResponses setObject:JSON forKey:TAG_GET_FAQ];
}
@catch (NSException *exception) {
id tracker = [[GAI sharedInstance] defaultTracker];
NSString* message = [NSString stringWithFormat:@"Exception ApiRequests: %@", exception];
[tracker send:[[GAIDictionaryBuilder createExceptionWithDescription:message withFatal:NO] build]];
NSLog(@"Error in [ApiRequests getFaq] - possible null response");
[self.responses setObject:[[NSMutableDictionary alloc] init] forKey:TAG_GET_FAQ];
[self.processedResponses setObject:[[NSMutableDictionary alloc] init] forKey:TAG_GET_FAQ];
}
@finally
{
[self setNetworkActivityIndicatorVisibility:TAG_GET_FAQ];
}
});
}
Constants.h
extern NSString* const TAG_GET_FAQ;
extern NSString* const TAG_API_PATH_GET_FAQ;
Constants.m
NSString* const TAG_GET_FAQ = @"fooBar1";
NSString* const TAG_API_PATH_GET_FAQ = @"fooBar2";
答案 0 :(得分：0)
你应该确保他们的密钥不是零。密钥应符合NSCopying协议。
请参阅here
并在 Apple文档
中The key for value. Note that when using key-value coding, the key must be a string (see “Key-Value Coding Fundamentals”).
答案 1 :(得分：0)
看起来有些内存损坏，可能发生在代码中的任何地方。不会抛出任何异常，因此不会捕获任何异常。
答案 2 :(得分：0)
严格阅读您的代码，
TAG_API_PATH_GET_FAQ = @"fooBar2";
表示
[TAG_API_PATH_GET_FAQ stringByReplacingOccurrencesOfString:@"LANGUAGE" withString:ln];
将是fooBar2。
我猜这将会成为
id JSON=[apiConnection get:apiPath];
返回零。我这样说是因为你的寄存器
Thread 7 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x00676f6c7379732f x7: 0x0000000000000110
x8: 0x000000000c000000 x9: 0x0000000004000000 x10: 0x000000000000000a x11: 0x0000000000000007
大部分都是零（告诉我回到基础套路的零）。
您是否忘记使用正确的值更新fooBar2？如果你故意模糊了这个的实际价值，那么你能用更接近实际例子的内容来替换你的帖子吗。
此外，try-catch的使用与Apple家居风格（您可能不同意）不符。 try-catch用于编程错误，不会对外部系统做出错误的响应。
如果你有一个热门数据结构（并发添加/删除），那么值得投资记录数据的所有更新，并可能有断言。