如何在ObjectiveC中从NSString中拆分换行符

问题描述

对于我的新项目。我已将我的csv文件内容加载为NSString。
首先，我需要通过换行拆分它，然后用逗号分隔每一行。
如何循环所有这些？你能帮我吗？

For my new project. i have loaded my csv file content as a NSString. First, i need to split this by newline, then split each line by comma.How can i loop all this? Could you please help me?

CSV内容

^ GSPC， 1403.36，4/27/2012，4:32 pm，+ 3.38,1400.19,1406.64,1397.31,574422720^ IXIC，3069.20，4/27/2012，5:30 pm，+ 18.59， 3060.34,3076.44,3043.30,0

"^GSPC",1403.36,"4/27/2012","4:32pm",+3.38,1400.19,1406.64,1397.31,574422720 "^IXIC",3069.20,"4/27/2012","5:30pm",+18.59,3060.34,3076.44,3043.30,0

ViewController.m

NSString* pathToFile = [[NSBundle mainBundle] pathForResource: @"quotes" ofType: @"csv"];
NSString *fileString = [NSString stringWithContentsOfFile:pathToFile encoding:NSUTF8StringEncoding error:nil];
if (!fileString) {
    NSLog(@"Error reading file.");
}

NSArray *array = [fileString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

for(int i=0; i<[array count]; i++){      
    //
}

推荐答案

可能要查看 NSMutableArray 。

// grab your file
NSMutableArray *data = [[fileString componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]] mutableCopy];
for (int i = 0; i < [data count]; i++)
{
    [data replaceObjectAtIndex: i
                    withObject: [[data objectAtIndex: i] componentsSeparatedByString: @","]];
}

相关地，Dave DeLong有一个合适的库来满足这个需求：

Relatedly, Dave DeLong has a proper library to address this need: https://github.com/davedelong/CHCSVParser

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