Create a Custom Formatted Dictionary Array from CSV File of Data

问题

I've created an iPhone app that has a dictionary array of locations (lat,long,point). I created the array by manually entering each value.

myLocationArray = @[
                 @{
                   kStation : @"1",
                   kLatitude : @( 41.656467),
                   kLongitude : @(-81.277963)
                   },
                 @{
                   kStation : @"2",
                   kLatitude : @(41.657118),
                   kLongitude : @(-81.276545)
                   },
                 @{
                   kStation : @"3",
                   kLatitude : @(41.658493),
                   kLongitude : @(-81.273542)
                   },
                  ...

This is good and works but now I want to create this array programmatically by getting the data from a .CSV file. I have a .CSV file (TestCSV.csv) that looks like this.

41.656467,-81.277963,27200
41.657118,-81.276545,27650
41.658493,-81.273542,28631.5
41.660728,-81.268547,30195
41.661830,-81.266065,30991
41.662828,-81.263819,31700
41.663677,-81.261962,32300
41.664578,-81.259909,32950
41.666210,-81.256312,34100
41.666921,-81.254708,34605
41.668043,-81.252191,35400
41.669044,-81.250043,36099
41.670120,-81.247495,36900
41.670778,-81.245957,37380
41.671459,-81.244292,37905
41.672028,-81.242832,38349
41.672487,-81.241702,38700
41.673106,-81.240175,39175
41.674364,-81.237007,40150
41.675170,-81.235038,40762.5
41.675716,-81.233698,41182
41.676143,-81.232614,41516

Specifically, I'd like to create myLocationArray (with formatting as shown) by reading straight from the TestCSV.csv. I'm not familiar with the code to achieve this and would really appreciate some direction.

Also, would it be any different or easier if the data was provided via text file instead of csv?

回答1:

Try

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Locations" ofType:@"csv"];
NSString *csvString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];

NSArray *locations = [csvString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

NSMutableArray *locationsArray = [NSMutableArray array];
for (NSString * location in locations)
{

    NSArray *components = [location componentsSeparatedByString:@","];

    double latitude   = [components[0] doubleValue];
    double longitude  = [components[1] doubleValue];
    NSString *station =  components[2];

    NSDictionary *dict = @{@"kLatitude": @(latitude),
                           @"kLongitude": @(longitude),
                           @"kStation": station};

    [locationsArray addObject:dict];

}

CSV File

Answer inspired from

回答2:

csv file IS a plain-text file. To achive what you want you can use NSScanner and NSString componentsSeparatedByString: Everything else is really simple.

回答3:

Answer provided by Anupdas. Cheers!

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Locations" ofType:@"csv"];
NSString *csvString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];

NSArray *locations = [csvString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

NSMutableArray *locationsArray = [NSMutableArray array];
for (NSString * location in locations)
{

NSArray *components = [location componentsSeparatedByString:@","];

double latitude   = [components[0] doubleValue];
double longitude  = [components[1] doubleValue];
NSString *station =  components[2];

NSDictionary *dict = @{@"kLatitude": @(latitude),
                       @"kLongitude": @(longitude),
                       @"kStation": station};

[locationsArray addObject:dict];

}

来源：https://stackoverflow.com/questions/16499180/create-a-custom-formatted-dictionary-array-from-csv-file-of-data

标签

ios

objective-c

nsstring

nsarray

nsfilemanager