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up vote 2 down vote favorite

I have NSArray *listArray with objects like - (id, name).

I would like sort array by (name) - 

    NSString *alphabet = [agencyIndex objectAtIndex:indexPath.section];
    //---get all states beginning with the letter---
    NSPredicate *predicate =
    [NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", alphabet];
    NSMutableArray *listSimpl = [[NSMutableArray alloc] init];
    for (int i=0; i<[[Database sharedDatabase].agents count]; i++) {
        Town *_town = [[Database sharedDatabase].agents objectAtIndex:i];
        [listSimpl addObject:_town];
    }
    NSArray *states = [listSimpl filteredArrayUsingPredicate:predicate];

But error - "Can't do a substring operation with something that isn't a string (lhs = <1, Arrow> rhs = A)"

How can i do this? I would like to filter Array with object by first letter in (name)- "A"

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possible duplicate of How to sort an NSMutableArray with custom objects in it? –  Martin R Sep 10 at 9:13
 
No, i would like to filter by first letter - "A" –  Nubaslon Sep 10 at 9:18
 
The most important piece of code for this post is the predicate itselft but was left out. Show how you defined the predicate? –  user523234 Sep 10 at 9:22

4 Answers

up vote 0 down vote accepted

Try with following code

NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF like %@", yourName];
NSArray *filteredArr = [yourArray filteredArrayUsingPredicate:pred];

EDITED :

NSPredicate pattern should be:

NSPredicate *pred =[NSPredicate predicateWithFormat:@"name beginswith[c] %@", alphabet];
share|improve this answer
 
Not working( Error - Can't do a substring operation with something that isn't a string (lhs = <1, Arraow> rhs = А) –  Nubaslon Sep 10 at 9:20
 
@please put your array list and explain me what you want ? –  iPatel Sep 10 at 9:23
 
@Nubaslon- change NSPredicate pattern such like SELF beginswith[c] %@ –  iPatel Sep 10 at 9:24
 
i already have it –  Nubaslon Sep 10 at 9:26
 
Array contains object of class Town, Town has property - id, name –  Nubaslon Sep 10 at 9:29
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up vote 0 down vote

NSArray offers another selector for sorting arrays:

NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    Person *first = (Person *) obj1;
    Person *second = (Person *) obj2; 

    return [first.name compare:second.name];
}];
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up vote 0 down vote

visit https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Collections/Articles/Arrays.html

use this [listArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

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up vote 0 down vote

If you want to filter array take a look on this code:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == %@", @"qwe"];
NSArray *result = [self.categoryItems filteredArrayUsingPredicate:predicate];

But if you want to sort array take a look on the following functions:

- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context;
- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context hint:(NSData *)hint;
- (NSArray *)sortedArrayUsingSelector:(SEL)comparator;
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