如何将用户输入与csv文件中的列数据进行比较？

Question

我使用下面的代码，但它只检查第一行的第一列。但是我想检查一个csv文件中所有行的第一列。请帮助

- (void) SearchStudent 

{ 
    NSArray *DocumentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //I upload the csv file to documents folder of the app through itunes 
    NSString *DocumentDirectory = [DocumentPath objectAtIndex:0]; 
    NSString *FullPath = [DocumentDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"example.csv"]]; 
    NSString * pstrCSVFile= [NSString stringWithContentsOfFile:FullPath encoding:NSASCIIStringEncoding error:NULL]; 
    NSArray * paRowsOfCSVFile= [pstrCSVFile componentsSeparatedByString:@"\n"]; 
    NSArray *paColumnsOfRow; 

    NSString *pstrFirstColumn;  
    for(NSString * pstrRow in paRowsOfCSVFile) 
    { 
     paColumnsOfRow= [pstrRow componentsSeparatedByString:@","]; 
     pstrFirstColumn= [paColumnsOfRow objectAtIndex:0]; 
     if([pstrFirstColumn localizedCaseInsensitiveCompare:GWIDText.text] == NSOrderedSame) 
     { 
      UIAlertView *alertingFileName = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Found" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
      [alertingFileName show]; 
      break; 
     } 
     else 
     { 
      UIAlertView *alertingFileName1 = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Not Found" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
      [alertingFileName1 show]; 
     } 
    } 
} 

Answer 1

paColumnsOfRow包含所有行。