xcode 从 csv 文件 (iphone SDk) 加载数据
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Load data from csv file (iphone SDk)
提问by Ni.
Does anyone know how to load data from csv file?
有谁知道如何从 csv 文件加载数据？
For the code example, CPTestAppScatterPlotController.m that I downloaded from core-plot Google website, a line graph can be plotted based on randomly generated initial data x, y.
对于我从 core-plot Google 网站下载的代码示例 CPTestAppScatterPlotController.m，可以根据随机生成的初始数据 x、y 绘制折线图。
// 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;
Then i modified the code,
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;
It seems that my code could not read the data from csv file. (there are two cols of the data in ECG_Data.csv, one for time and one for data) Can anyone give me some suggestion??? Thanks!!!!
我的代码似乎无法从 csv 文件中读取数据。（ECG_Data.csv 中有两列数据，一列用于时间，一列用于数据）谁能给我一些建议？？？谢谢！！！！
回答by benasher44
http://cocoawithlove.com/2009/11/writing-parser-using-nsscanner-csv.html
http://cocoawithlove.com/2009/11/writing-parser-using-nsscanner-csv.html
Here is a good place to start for creating a CSV parser. It's complete with sample code and user comments.
这是创建 CSV 解析器的好地方。它包含示例代码和用户评论。
