Question

i’m scanning wifi info using NSMutableArray, but there are few duplicate values appear, so i try to use following code but still getting the duplicate values,

if([scan_networks count] > 0) 
{
    NSArray *uniqueNetwork = [[NSMutableArray alloc] initWithArray:[[NSSet setWithArray:scan_networks] allObjects]];
    [scan_networks removeAllObjects];

    NSSortDescriptor *networkName = [[[NSSortDescriptor alloc] initWithKey:@"SSID_STR" ascending:YES] autorelease];
    NSArray *descriptors = [NSArray arrayWithObjects:networkName,nil];

    [scan_networks addObjectsFromArray:[uniqueNetwork sortedArrayUsingDescriptors:descriptors]];
}

how this can be resolve, thanks

Answer 1

You can use NSSET but if you it is only used when order doesn’t matter if order matter then go for this approach.I have used it and it give perfect answer. in Place of NSmutableArray array put your NSmutableArray which contains duplicate Value.

NSArray *copy = [NSmutableArray copy];

NSInteger index = [copy count] - 1;

for (id object in [copy reverseObjectEnumerator])
 {

 if ([NSmutableArray indexOfObject:object inRange:NSMakeRange(0, index)] != NSNotFound)

 {
        [NSmutableArray removeObjectAtIndex:index];

 }

    index--;
}

[copy release];