在iOS中逐行解析CSV

Question

我正在解析objective-c中的CSV文件.该文件包含以下内容:

line 40 | Rising searches
line 41 | nabi avcı,Breakout
line 42 | stonewall,+700%
line 43 | medgar evers,+500%
line 44 | lgbt,+350%
line 45 | roe v wade,+350%
line 46 | αÏεÏγια,+250%

我想得到第41到50行(含)的内容.然后我想把每一行分成两行,NSStrings其中包含之前的东西,,另一行之后的东西.我怎样才能做到这一点？

任何帮助都非常感谢.谢谢!安托万

Answer 1

尝试使用Dave DeLong的CHCSVParser.https://github.com/davedelong/CHCSVParser

您可以使用CSV文件的路径初始化解析器(假设您有CHCSVParser*_parser实例变量):

NSString *filePath = ...; // the path to your CSV file
_parser = [[CHCSVParser alloc] initWithContentsOfCSVFile:filePath];
_parser.delegate = self;
[_parser parse];

然后,您应该使用三种委托方法的组合来自定义解析器并使其满足您的需求:

- (void)parser:(CHCSVParser *)parser didBeginLine:(NSUInteger)recordNumber
{
    // Only parse the fields on lines 41 to 50
    // _shouldParseLine is an ivar that is set to YES
    // only when the fields inside the following line or lines
    // should be parsed.
    if (recordNumber == 41) {
        _shouldParseLine = YES;
    }
}

- (void)parser:(CHCSVParser *)parser didEndLine:(NSUInteger)recordNumber 
{
    if (recordNumber == 50) {
        // The parser has finished parsing the 50th line
        // We're done, cancel any further parsing.
        // It is not necessary to set _shouldParseLine to NO, 
        // since the parser is killed here and the didReadField
        // delegate method will not be called again.
        [parser cancelParsing];
    }
}

- (void)parser:(CHCSVParser *)parser didReadField:(NSString *)field atIndex:(NSInteger)fieldIndex
{
    if (_shouldParseLine == YES) {
        // Here are your fields.
        // The field at index 0 consists of the text
        // before the comma, the field at index 1
        // consists of the text after the comma.
    }
}