#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>  @interface UncaughtExceptionHandler : NSObject
{  BOOL dismissed;
}
+(void) InstallUncaughtExceptionHandler;
@end  

//利用 NSSetUncaughtExceptionHandler，当程序异常退出的时候，可以先进行处理，然后做一些自定义的动作，比如下面一段代码，就是网上有人写的，直接在发生异常时给某人发送邮件，</span>
void UncaughtExceptionHandlers (NSException *exception);  #import "UncaughtExceptionHandler.h"
#include <libkern/OSAtomic.h>
#include <execinfo.h>
NSString * const UncaughtExceptionHandlerSignalExceptionName = @"UncaughtExceptionHandlerSignalExceptionName";
NSString * const UncaughtExceptionHandlerSignalKey = @"UncaughtExceptionHandlerSignalKey";
NSString * const UncaughtExceptionHandlerAddressesKey = @"UncaughtExceptionHandlerAddressesKey";
volatile int32_t UncaughtExceptionCount = 0;
const int32_t UncaughtExceptionMaximum = 10;
const NSInteger UncaughtExceptionHandlerSkipAddressCount = 4;
const NSInteger UncaughtExceptionHandlerReportAddressCount = 5;
NSString* getAppInfo()
{  NSString *appInfo = [NSString stringWithFormat:@"App : %@ %@(%@)\nDevice : %@\nOS Version : %@ %@\n",  [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"],  [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"],  [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"],  [UIDevice currentDevice].model,  [UIDevice currentDevice].systemName,  [UIDevice currentDevice].systemVersion];  //                         [UIDevice currentDevice].uniqueIdentifier];  NSLog(@"Crash!!!! %@", appInfo);  return appInfo;
}  void MySignalHandler(int signal)
{  int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount);  if (exceptionCount > UncaughtExceptionMaximum)  {  return;  }  if(signal==11)  {//比较坑爹的是 我遇到的一个问题只有iPhone5出现问题 但是我这边测试的没有iPhone5 无法直接log  可能是内存不足 果然 删除几个应用就可以了 所以加了这句  UIAlertView * tip2 = [[UIAlertView alloc]initWithTitle:@"可能原因:key" message:@"内存不足" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];  [tip2 show];  [tip2 release];  }  NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:UncaughtExceptionHandlerSignalKey];  NSArray *callStack = [UncaughtExceptionHandler backtrace];  [userInfo setObject:callStack forKey:UncaughtExceptionHandlerAddressesKey];  [[[[UncaughtExceptionHandler alloc] init] autorelease]  performSelectorOnMainThread:@selector(handleException:)  withObject:  [NSException  exceptionWithName:UncaughtExceptionHandlerSignalExceptionName  reason:  [NSString stringWithFormat:  NSLocalizedString(@"Signal %d was raised.\n"  @"%@", nil),  signal, getAppInfo()]  userInfo:  [NSDictionary  dictionaryWithObject:[NSNumber numberWithInt:signal]  forKey:UncaughtExceptionHandlerSignalKey]]  waitUntilDone:YES];  }  @implementation UncaughtExceptionHandler
+(void) InstallUncaughtExceptionHandler
{  signal(SIGABRT, MySignalHandler);  signal(SIGILL, MySignalHandler);  signal(SIGSEGV, MySignalHandler);  signal(SIGFPE, MySignalHandler);  signal(SIGBUS, MySignalHandler);  signal(SIGPIPE, MySignalHandler);
}
+ (NSArray *)backtrace
{  void* callstack[128];  int frames = backtrace(callstack, 128);  char **strs = backtrace_symbols(callstack, frames);  int i;  NSMutableArray *backtrace = [NSMutableArray arrayWithCapacity:frames];  for (  i = UncaughtExceptionHandlerSkipAddressCount;  i < UncaughtExceptionHandlerSkipAddressCount +  UncaughtExceptionHandlerReportAddressCount;  i++)  {  [backtrace addObject:[NSString stringWithUTF8String:strs[i]]];  }  free(strs);  return backtrace;
}
- (void)alertView:(UIAlertView *)anAlertView clickedButtonAtIndex:(NSInteger)anIndex
{  if (anIndex == 0)  {  dismissed = YES;  }
}
- (void)handleException:(NSException *)exception
{  UIAlertView *alert =  [[[UIAlertView alloc]  initWithTitle:NSLocalizedString(@"Unhandled exception", nil)  message:[NSString stringWithFormat:NSLocalizedString(  @"You can try to continue but the application may be unstable.\n"  @"%@\n%@", nil),  [exception reason],  [[exception userInfo] objectForKey:UncaughtExceptionHandlerAddressesKey]]  delegate:self  cancelButtonTitle:NSLocalizedString(@"Quit", nil)  otherButtonTitles:NSLocalizedString(@"Continue", nil), nil]  autorelease];  [alert show];  CFRunLoopRef runLoop = CFRunLoopGetCurrent();  CFArrayRef allModes = CFRunLoopCopyAllModes(runLoop);  while (!dismissed)  {  for (NSString *mode in (NSArray *)allModes)  {  CFRunLoopRunInMode((CFStringRef)mode, 0.001, false);  }  }  CFRelease(allModes);  NSSetUncaughtExceptionHandler(NULL);  signal(SIGABRT, SIG_DFL);  signal(SIGILL, SIG_DFL);  signal(SIGSEGV, SIG_DFL);  signal(SIGFPE, SIG_DFL);  signal(SIGBUS, SIG_DFL);  signal(SIGPIPE, SIG_DFL);  if ([[exception name] isEqual:UncaughtExceptionHandlerSignalExceptionName])  {  kill(getpid(), [[[exception userInfo] objectForKey:UncaughtExceptionHandlerSignalKey] intValue]);  }  else  {  [exception raise];  }
}
void UncaughtExceptionHandlers (NSException *exception) {  NSArray *arr = [exception callStackSymbols];  NSString *reason = [exception reason];  NSString *name = [exception name];  NSString *urlStr = [NSString stringWithFormat:@"mailto://1140454645@qq.com?subject=bug报告&body=感谢您的配合!<br><br><br>"  "错误详情:<br>%@<br>--------------------------<br>%@<br>---------------------<br>%@",  name,reason,[arr componentsJoinedByString:@"<br>"]];  NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];  [[UIApplication sharedApplication] openURL:url];  //或者直接用代码，输入这个崩溃信息，以便在console中进一步分析错误原因  NSLog(@"1heqin, CRASH: %@", exception);  NSLog(@"heqin, Stack Trace: %@", [exception callStackSymbols]);
}  @end  //然后在delegate文件里面- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions函数里面
[UncaughtExceptionHandler InstallUncaughtExceptionHandler];  NSSetUncaughtExceptionHandler (&UncaughtExceptionHandlers);