Put multiple arrays in Dictionary

Question

I am parsing a CSV file multiple times with for loop, here I need to store these arrays one by one dictionary. There are very less questions in stack about adding NSArray to NSDictionary. I am parsing CSV with below code but I strucked at storing in NSDictionary, The program is terminating and showing warning at assigning string to dictionary

for (i=0; i<=57; i++) {
    NSString *keysString = [csvArray objectAtIndex:i];
    NSArray *keysArray = [keysString componentsSeparatedByString:@","];
    NSLog(@"Serail No %d %@",i,keysArray);
    NSString *string = [NSString stringWithFormat:@"%d", i];
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjects: keysArray forKeys: string];
  }

what is an issue, error?

Tirth
– Tirth

2015-02-10 06:39:01 +00:00
Commented Feb 10, 2015 at 6:39 — Tirth
– Tirth, Commented Feb 10, 2015 at 6:39

Fawad Masud · Accepted Answer · 2015-02-10 06:53:30Z

2

NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];

for (i=0; i<=57; i++) {
 NSString *keysString = [csvArray objectAtIndex:i];
 NSArray *keysArray = [keysString componentsSeparatedByString:@","];
 NSString *key = [NSString stringWithFormat:@"serial%d",i];
 [dict setObject:keysArray forKey:key];

 }

To get back data from dictionary,

NSArray *array = [dict valueForKey:@"serial24"];//to get array 24.

edited Feb 10, 2015 at 6:53

answered Feb 10, 2015 at 6:44

Fawad Masud

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Comments

Paulw11 · Accepted Answer · 2015-02-10 06:46:50Z

If I understand you correctly, you want to add the arrays to a dictionary, with the key being the string value of integer i ? What you need to do is allocate the dictionary outside your loop -

NSMutableDictionary *dict=[NSMutableDictionary new];
for (i=0; i<=57; i++) {
   NSString *keysString = [csvArray objectAtIndex:i];
   NSArray *keysArray = [keysString componentsSeparatedByString:@","];
   NSLog(@"Serial No %d %@",i,keysArray);
   NSString *string = [NSString stringWithFormat:@"%d", i];
   dict[string]=keysArray;
}

I am not sure why you would want to do this, because this is basically an array. You could simply do -

NSMutableArray *outputArray=[NSMutableArray new];
for (NSString *keysString in csvArray) {
   NSArray *keysArray = [keysString componentsSeparatedByString:@","];
   [outputArray addObject:keysArray];
}

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