how to sort Chinese character into # in UILocalizedIndexedCollation - ios

Question

i'm wondering on how to sort Chinese character into "#" instead of A-Z.
any comments are greatly appreciated.
-(NSArray *)partitionObjects:(NSArray *)array collationStringSelector:(SEL)selector
{
self.collation = [UILocalizedIndexedCollation currentCollation];
NSInteger sectionCount = [[self.collation sectionTitles] count];//section count is take from sectionTitles and not sectionIndexTitles
NSMutableArray *unsortedSections = [NSMutableArray arrayWithCapacity:sectionCount];
//create an array to hold the data for each section
for(int i = 0; i < sectionCount; i++)
{
[unsortedSections addObject:[NSMutableArray array]];
}
//put each object into a section
for (id object in array)
{
NSInteger index = [self.collation sectionForObject:object collationStringSelector:selector];
[[unsortedSections objectAtIndex:index] addObject:object];
}
NSMutableArray *sections = [NSMutableArray arrayWithCapacity:sectionCount];
//sort each section
for (NSMutableArray *section in unsortedSections)
{
[sections addObject:[self.collation sortedArrayFromArray:section collationStringSelector:selector]];
}
return sections;
}

Answer 1

This is what i ended up doing
-(NSArray *)partitionObjects:(NSArray *)array collationStringSelector:(SEL)selector
{
self.collation = [UILocalizedIndexedCollation currentCollation];
NSInteger sectionCount = [[self.collation sectionTitles] count];//section count is take from sectionTitles and not sectionIndexTitles
NSMutableArray *unsortedSections = [NSMutableArray arrayWithCapacity:sectionCount];
//create an array to hold the data for each section
for(int i = 0; i < sectionCount; i++)
{
[unsortedSections addObject:[NSMutableArray array]];
}
if ([self.catString isEqualToString:ARTISTS])
{
//put each object into a section
for (id object in array)
{
if (!object)
{
continue;
}
NSInteger index = [self.collation sectionForObject:object collationStringSelector:selector];
[[unsortedSections objectAtIndex:index] addObject:object];
}
}
else
{
NSInteger index;
for (id object in array)
{
Song *songItem = object;
NSString* charIndex;
if([songItem.songName length]<=2)
{
charIndex = [songItem.songName substringToIndex:1];
}
else if([songItem.songName length]<=3)
{
charIndex = [songItem.songName substringToIndex:2];
}
else if([songItem.songName length]<=4)
{
charIndex = [songItem.songName substringToIndex:3];
}
else if([songItem.songName length]>=5)
{
charIndex = [songItem.songName substringToIndex:4];
}
NSRegularExpression *regex = [[NSRegularExpression alloc]
initWithPattern:#"[a-zA-Z]" options:0 error:NULL];
NSUInteger matches = [regex numberOfMatchesInString:charIndex options:0
range:NSMakeRange(0, [charIndex length])];
if (matches >=2)
{
index = [self.collation sectionForObject:object collationStringSelector:selector];
[[unsortedSections objectAtIndex:index] addObject:object];
}
else
{
index = 26; //add object to last index "#"
[[unsortedSections objectAtIndex:index] addObject:object];
}
songItem = nil;
}
}
NSMutableArray *sections = [NSMutableArray arrayWithCapacity:sectionCount];
//sort each section
for (NSMutableArray *section in unsortedSections)
{
[sections addObject:[self.collation sortedArrayFromArray:section collationStringSelector:selector]];
}
return sections;
}