Question

i have problem sorting the arrays.i have two problems.
1.Sorting rightArray with the following code is not working.
2.i also have a leftArray whose indexes should be changed comparing to the right Array,when right array is sorted.Is it possible?.

NSArray *rightArray = [[NSArray alloc] initWithObjects:[mutArray objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 11)]], nil];
NSArray *sortedArray = [rightArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
NSLog(@"%@",sortedArray);

Output:after i sorted using the above code

2012-10-25 19:11:44.571 Converter[3511:207] (
    (
    USD,
    EUR,
    GBP,
    JPY,
    CAD,
    AUD,
    INR,
    CHF,
    CNY,
    KWD,
    SGD
)
)

Answer 1

NSArray *rightArray = [[NSArray alloc] initWithObjects:[mutArray objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 11)]], nil];
NSArray *sortedArray = [[rightArray lastObject] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
NSLog(@"%@",sortedArray);

Your strings are in an array in your array. Get the only object in rightArray and sort it.

edit

For the second question you can use an intermediate data structure

NSMutableDictionary *temp = [[NSMutableDictionary alloc] init];
NSArray *keys = [rightArray lastObject]; 
NSArray *objs = [leftArray lastObject]; // presuming they're also an array in an array

for (int i = 0; i < [keys count]; i++) {
    // we'll use the dictionary to set an one-to-one relationship
    [temp setObject:[objs objectAtIndex:i] forKey:[keys objectAtIndex:i]];
}

NSArray *sortedKeys = [keys sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
NSArray *sortedObjs = [temp objectsForKeys:sortedKeys notFoundMarker:[NSNull null]];
[temp release]; // if not using ARC