Document下创建文件.

    NSFileManager *fileManager = [NSFileManagerdefaultManager];

    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSAllDomainsMask, YES)objectAtIndex:0];

   BOOL isDir = NO;

   NSString *fanDir = [NSStringstringWithFormat:@"%@/1",documentPath];

   if(![fileManager fileExistsAtPath:fanDirisDirectory:&isDir])

    {

       NSError *error = nil;

        [fileManager createDirectoryAtPath:fanDirwithIntermediateDirectories:YESattributes:nilerror:&error];

        NSLog(@"%@",[errorlocalizedDescription]);

    }

   NSString *fileName = @"1.txt";

   NSString *fullPath = [NSStringstringWithFormat:@"%@/%@",fanDir,fileName];

    [fileManager createFileAtPath:fullPathcontents:nilattributes:nil];