iphone - iOS 中的 CSV 逐行解析

Question

我正在 Objective-c 中解析 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行到第50行(含)的内容。然后，我想将每一行分成两个 NSString，一个包含 , 之前的内容，另一个包含其之后的内容。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 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(delegate)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.
    }
}