+ (void)createFolder:(NSString *)folderName {      NSString *imageDir = [NSString stringWithFormat:@"%@/Documents/%@", NSHomeDirectory(),folderName];      NSLog(@"HomeDir: %@",imageDir);      BOOL isDir = NO;      NSFileManager *fileManager = [NSFileManager defaultManager];      BOOL existed = [fileManager fileExistsAtPath:imageDir isDirectory:&isDir];      if ( !(isDir == YES && existed == YES) )      {          [fileManager createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];      }  }    + (void)deleteFolder:(NSString *)folderName {      NSString *imageDir = [NSString stringWithFormat:@"%@/Documents/%@", NSHomeDirectory(),folderName];      NSLog(@"HomeDir: %@",imageDir);      NSFileManager *fileManager = [NSFileManager defaultManager];      [fileManager removeItemAtPath:imageDir error:nil];  }    + (void)changeFolderName:(NSString *)folderName beforeName:(NSString *)beforeName {      NSFileManager *fm = [NSFileManager defaultManager];      NSString *beforeFolder = [NSString stringWithFormat:@"%@/Documents/%@", NSHomeDirectory(),beforeName];      NSString *afterFolder = [NSString stringWithFormat:@"%@/Documents/%@", NSHomeDirectory(),folderName];           [fm createDirectoryAtPath:afterFolder withIntermediateDirectories:YES attributes:nil error:nil];           NSDirectoryEnumerator *dirEnum = [fm enumeratorAtPath:beforeFolder];      NSString *path;      while ((path = [dirEnum nextObject]) != nil) {          [fm moveItemAtPath:[NSString stringWithFormat:@"%@/%@",beforeFolder,path]                      toPath:[NSString stringWithFormat:@"%@/%@",afterFolder,path]                       error:NULL];      }      [fm removeItemAtPath:beforeFolder error:nil];  }