昨天調試一個程序，需要在Cache目錄下新建子目錄，代碼如下        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);        NSString *libDirectory = [paths objectAtIndex:0];        NSString *path = [libDirectory stringByAppendingPathComponent:Kache_Objects_Disk_Path];        if (! [[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:YES]) {            NSError *error;             [[NSFileManager defaultManager] createDirectoryAtPath:path                                       withIntermediateDirectories:YES                                                        attributes:nil                                                             error:&error];            NSLog(@"error:%@", error);         }     }結果在if判斷的時候，path變量直接報BAD_ACCESS了，打印對象只有一段地址，沒有內容了。但是字這行執行之前，path還是好的。求解