iphone - 从 csv 文件加载数据 (iphone SDK)

Question

有人知道如何从 csv 文件加载数据吗？

对于代码示例，CPTestAppScatterPlotController.m我从 core-plot Google 网站下载的，可以根据随机绘制折线图生成初始数据x,y。

 // Add some initial data
 SMutableArray *contentArray = [NSMutableArray arrayWithCapacity:100];
 NSUInteger i;
 for ( i = 0; i < 60; i++ ) {
     id x = [NSNumber numberWithFloat:1+i*0.05];
     id y = [NSNumber numberWithFloat:1.2*rand()/(float)RAND_MAX + 1.2];
     [contentArray addObject:[NSMutableDictionary 
                      dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]];
}
self.dataForPlot = contentArray;

然后我修改了代码，

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"ECG_Data" ofType:@"csv"];
NSString *myText = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil ];
NSScanner *scanner = [NSScanner scannerWithString:myText];
[scanner setCharactersToBeSkipped:[NSCharacterSet characterSetWithCharactersInString:@"\n, "]];
NSMutableArray *newPoints = [NSMutableArray array];           
float time, data;
while ( [scanner scanFloat:&time] && [scanner scanFloat:&data] ) {
    [newPoints addObject:
    [NSMutableDictionary dictionaryWithObjectsAndKeys:
            [NSNumber numberWithFloat:time], @"time",
            [NSNumber numberWithFloat:data], @"data",
             nil]];
}
self.dataForPlot = newPoints;

我的代码似乎无法从 csv 文件读取数据。(ECG_Data.csv中有两列数据，一列为时间，一列为数据)有人可以给我一些建议吗？？？谢谢!!!!

Answer 1

http://cocoawithlove.com/2009/11/writing-parser-using-nsscanner-csv.html

这里是创建 CSV 解析器的好起点。它包含示例代码和用户评论。