iphone - 在 iOS 中按行解析 CSV

Question

我在 Objective-c 中解析一个 CSV 文件。该文件包含如下内容：

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%

我想获取第 41 到 50 行（含）的内容。然后，我想将每一行分成两行，NSStrings其中一行包含前面的内容,，另一行包含后面的内容。我怎样才能做到这一点？

非常感谢任何帮助。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（假设您有一个 CHCSVParser *_parser 实例变量）：

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

然后您应该使用三个委托方法的组合来自定义解析器并使其适合您的需求：

- (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.
    }
}