iOS: CHCSVParser & NSPredicate? - ios

Question

I'm currently attempting to use CHCSVParser to parse through a CSV file containing over 1500 entries, and 8 rows. I've successfully managed to parse through the file, and what I get is an NSArray of NSArrays of NSStrings.
For example here's what I get:
Loading CSV from: (
(
Last,
First,
Middle,
Nickname,
Gender,
City,
Age,
Email
),
(
Doe,
John,
Awesome,
"JD",
M,
"San Francisco",
"20",
"john#john.doe"
),
How could I sort this into a Person object and filter through it using NSPredicate, like Mattt Thompson does here.
Here's how I initialize the parser:
//Prepare Roster
NSString *pathToFile = [[NSBundle mainBundle] pathForResource:#"myFile" ofType: #"csv"];
NSArray *myFile = [NSArray arrayWithContentsOfCSVFile:pathToFile options:CHCSVParserOptionsSanitizesFields];
NSLog(#"Loading CSV from: %#", myFile);
Here's what Mattt does in the article I linked, which I'd like to do with my code:
NSArray *firstNames = #[ #"Alice", #"Bob", #"Charlie", #"Quentin" ];
NSArray *lastNames = #[ #"Smith", #"Jones", #"Smith", #"Alberts" ];
NSArray *ages = #[ #24, #27, #33, #31 ];
NSMutableArray *people = [NSMutableArray array];
[firstNames enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
Person *person = [[Person alloc] init];
person.firstName = firstNames[idx];
person.lastName = lastNames[idx];
person.age = ages[idx];
[people addObject:person];
}];

Answer 1

First, define a suitable Person class:
#interface Person : NSObject
#property(copy, nonatomic) NSString *firstName;
#property(copy, nonatomic) NSString *lastName;
// ...
#property(nonatomic) int age;
// ...
#end
Then you can read your data into an array of Person objects by enumerating the
myFile array. Inside the block, row is the "sub-array" for a single row:
NSMutableArray *people = [NSMutableArray array];
[myFile enumerateObjectsUsingBlock:^(NSArray *row, NSUInteger idx, BOOL *stop) {
if (row > 0) { // Skip row # 0 (the header)
Person *person = [[Person alloc] init];
person.lastName = row[0];
person.firstName = row[1];
// ...
person.age = [row[6] intValue];
// ...
[people addObject:person];
}
}];
Now you can filter that array as shown in the tutorial:
NSPredicate *smithPredicate = [NSPredicate predicateWithFormat:#"lastName = %#", #"Smith"];
NSArray *filtered = [people filteredArrayUsingPredicate:smithPredicate];