Sort NSArray based on a list of values?

Question

How to sort an NSArray based on a list of values ? For example:

An object of the NSArray has a property :

NSString* language; //- may contain value @"FR", @"NL", @"SP", @"EN", and others languages

How can we sort based on the list of values like:

NSArray* sortingByList = @[@"FR", @"NL", @"SP", @"EN"];

The expected results should look like this:

- FR
- FR
- NL
- NL
- NL
- SP
- SP
- EN
- EN
- EN
- other languages 
...

Answer 1

- (NSArray*) sortArray:(NSArray *)language withOrder:(NSArray *)sortingByList
{
    return [language sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        NSUInteger pos1 = [sortingByList indexOfObject:obj1];
        NSUInteger pos2 = [sortingByList indexOfObject:obj2];
        if (pos1 < pos2)
            return NSOrderedAscending;
        else if (pos1 == pos2)
            return NSOrderedSame;
        else
            return NSOrderedDescending;
    }];
}