未キャッチの例外をキャッチするメソッドを登録してEXC_BAD_ACCESSを保存する

gistfile1.m

void uncaughtExceptionHandler(NSException *exception); 

void uncaughtExceptionHandler(NSException *exception) 
{
    NSString *crashReport = [NSString stringWithFormat:@"Crash Name:%@\r\n%@\r\nStack Trace:%@",[exception name], [exception reason], [exception callStackSymbols]];

    NSString *crashSection = @"====Crash Report====";
    
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    [ud setObject:[NSString stringWithFormat:@"%@\r\n%@",crashSection,crashReport] forKey:@"CrashReportText"];
    [ud synchronize];
    NSLog(@"-- %@",crashReport);
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);
    return YES;
}