Question

我创建了一个iPhone应用程序，它有一个位置字典数组（lat，long，point）。我通过手动输入每个值来创建数组。

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)
                   },
                  ...

这很好并且有效但现在我想通过从.CSV文件获取数据来以编程方式创建此数组。我有一个.CSV文件（TestCSV.csv），看起来像这样。

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

具体来说，我想通过直接从TestCSV.csv中读取来创建myLocationArray（如图所示的格式）。我不熟悉实现这一目标的代码，并且非常欣赏某些方向。

另外，如果数据是通过文本文件而不是csv提供的，那会有什么不同或更容易吗？

Answer 1

尝试

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

答案启发from

Answer 2

csv文件是纯文本文件。要实现您的目标，您可以使用NSScanner和NSString componentsSeparatedByString:其他一切都非常简单。

Answer 3

Anupdas提供的答案。干杯！

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];

}

从CSV文件数据创建自定义格式化字典数组

3 个答案: