我正在编写一个使用 NSOutputStream 的应用程序。我像这样初始化连接：
delegate = self;
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)url,port, &readStream, &writeStream);
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
inputStream = (__bridge_transfer NSInputStream *)readStream;
outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream setDelegate:delegate];
[outputStream setDelegate:delegate];
loop = [NSRunLoop currentRunLoop];
[inputStream scheduleInRunLoop:loop forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:loop forMode:NSDefaultRunLoopMode];
[inputStream setProperty:NSStreamSocketSecurityLevelTLSv1 forKey:NSStreamSocketSecurityLevelKey];
[outputStream setProperty:NSStreamSocketSecurityLevelTLSv1 forKey:NSStreamSocketSecurityLevelKey];
[inputStream setProperty:NSStreamSocketSecurityLevelNegotiatedSSL
forKey:NSStreamSocketSecurityLevelKey];
[outputStream setProperty:NSStreamSocketSecurityLevelNegotiatedSSL
forKey:NSStreamSocketSecurityLevelKey];
NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCFStreamSSLAllowsExpiredCertificates,
[NSNumber numberWithBool:YES], kCFStreamSSLAllowsAnyRoot,
[NSNumber numberWithBool:NO], kCFStreamSSLValidatesCertificateChain,
kCFNull,kCFStreamSSLPeerName,
nil];
CFReadStreamSetProperty((CFReadStreamRef)inputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);
CFWriteStreamSetProperty((CFWriteStreamRef)outputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);
[outputStream open];
[inputStream open];
[self sendVersionOrWait];
[loop run];
然后根据 NSStreamDelegate 方法做一些动作。关闭连接通过以下方式完成：
[inputStream close];
[outputStream close];
[inputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream setDelegate:nil];
[outputStream setDelegate:nil];
inputStream = nil;
outputStream = nil;
有时（它是随机的）我得到 EXC_BREAKPOINT 并且应用程序崩溃。这是崩溃日志的一部分：
异常类型：EXC_BREAKPOINT (SIGTRAP) 异常代码：0x0000000000000001、0x000000000000defe 由线程触发：5
线程 5 名称：调度队列：com.apple.root.default-qos
线程 5 崩溃：
0 核心基础 0x22767e22 CFHash + 130
1 核心基础 0x22768d70 CFBasicHashGetCountOfKey + 1152
2 核心基础 0x227688aa CFSetContainsValue + 98
3 核心基础 0x2279ca5a CFRunLoopRemoveSource + 226
4 CFNetwork 0x22343eca SocketStream::write(__CFWriteStream*, unsigned char const*, long, CFStreamError*) + 426
5 CFNetwork 0x223480c2 WriteStreamCallbacks::_write(__CFWriteStream*, unsigned char const*, long, CFStreamError*, void*) + 34
6 核心基础 0x2278d7ec CFWriteStreamWrite + 356
7 应用程序 0x000a0190-[AppMenuViewController sendVersion] (AppMenuViewController.m:763)
8 应用程序 0x000a0c68-[AppMenuViewController sendVersionOrWait] (AppMenuViewController.m:832)
9 基础 0x235655e4 __NSFireDelayedPerform + 464
10 核心基础 0x22828734 CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 12
11 核心基础 0x228282b4 __CFRunLoopDoTimer + 652
12 核心基础 0x2282651e __CFRunLoopRun + 1414
13 核心基础 0x22773dac CFRunLoopRunSpecific + 472
14 核心基础 0x22773bbe CFRunLoopRunInMode + 102
15 基础 0x234ab16c -[NSRunLoop(NSRunLoop) 运行模式：beforeDate:] + 260
16 基础 0x234f95e0 -[NSRunLoop(NSRunLoop) 运行] + 76
17 应用程序 0x0009feaa-[AppMenuViewController initConnection:withPort:] (AppMenuViewController.m:749)
18 应用程序 0x000a1642-[AppMenuViewController 流：handleEvent：]（AppMenuViewController.m:952）
19 核心基础 0x227d9b94 _signalEventSync + 144
20 核心基础 0x227e3ef2 _cfstream_solo_signalEventSync + 198
21 核心基础 0x227d981e _CFStreamSignalEvent + 322
22 CFNetwork 0x222b7bd4 SocketStream::dispatchSignalFromSocketCallbackUnlocked(SocketStreamSignalHolder*) + 36
23 CFNetwork 0x222b78be SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 146
24 CFNetwork 0x222b77f2 SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 54
25 核心基础 0x2282b0bc __CFSocketPerformV0 + 552
26 核心基础 0x22828804 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 12
27 核心基础 0x22827c16 __CFRunLoopDoSources0 + 218
28 核心基础 0x22826294 __CFRunLoopRun + 764
29 核心基础 0x22773dac CFRunLoopRunSpecific + 472
30 核心基础 0x22773bbe CFRunLoopRunInMode + 102
31 基础 0x234ab16c -[NSRunLoop(NSRunLoop) 运行模式：beforeDate:] + 260
32 基础 0x234f95e0 -[NSRunLoop(NSRunLoop) 运行] + 76
33 应用程序 0x0009feaa-[AppMenuViewController initConnection:withPort:] (AppMenuViewController.m:749)
34 应用程序 0x0009b664 __58-[AppMenuViewController alertView:clickedButtonAtIndex:]_block_invoke (AppMenuViewController.m:385)
35 libdispatch.dylib 0x30521610 _dispatch_call_block_and_release + 8
36 libdispatch.dylib 0x3052d350 _dispatch_root_queue_drain + 816
37 libdispatch.dylib 0x3052e27a _dispatch_worker_thread3 + 102
38 libsystem_pthread.dylib 0x3069ee22 _pthread_wqthread + 666
39 libsystem_pthread.dylib 0x3069eb74 start_wqthread + 4
我想这可能是由网络问题引起的，因为它出现在我的 WIFI 路由器没有 Internet 连接时。但我不确定，也不知道如何消除此错误。请帮忙 ：）