Indexed sections in UITableView shows but doesn't scrolls - ios

Question

I have UITableView with countries and their phone codes
- (NSArray *)sortedCountryLetters {
if (_sortedCountryLetters == nil) {
[self countriesInfo];
}
return _sortedCountryLetters;
}
- (NSDictionary *)countriesInfo {
if (_countriesInfo == nil) {
NSMutableArray *countries = [NSMutableArray new];
for (NSString *key in [AppDelegate phoneCodes]) {
[countries addObject:#{
#"key": key,
#"name": [_locale displayNameForKey:NSLocaleCountryCode value:key],
#"code": [AppDelegate phoneCodes][key]
}];
}
NSMutableArray *firstLetters = [NSMutableArray new];
NSMutableDictionary *result = [NSMutableDictionary new];
for (NSDictionary *country in countries) {
NSString *name = country[#"name"];
NSString *firstLetter = [[name substringToIndex:1] uppercaseString];
if ([[result allKeys] containsObject:firstLetter]) {
NSMutableArray *letterCountries = result[firstLetter];
[letterCountries addObject:country];
}
else {
result[firstLetter] = [#[country] mutableCopy];
[firstLetters addObject:firstLetter];
}
}
[firstLetters sortUsingComparator:^NSComparisonResult(NSString *letter1, NSString *letter2) {
return [letter1 compare:letter2];
}];
_sortedCountryLetters = [firstLetters copy];
for (NSString *firstLetter in [result allKeys]) {
NSMutableArray *letterCountries = result[firstLetter];
[letterCountries sortUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {
NSString *name1 = obj1[#"name"];
NSString *name2 = obj2[#"name"];
return [[name1 lowercaseString] compare:[name2 lowercaseString]];
}];
}
_countriesInfo = [result copy];
}
return _countriesInfo;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[[self countriesInfo] allKeys] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSString *firstLetter = [self sortedCountryLetters][section];
NSArray *letterCountries = [self countriesInfo][firstLetter];
return [letterCountries count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"countryCell"];
NSString *firstLetter = [self sortedCountryLetters][indexPath.section];
NSArray *letterCountries = [self countriesInfo][firstLetter];
NSDictionary *country = letterCountries[indexPath.row];
[[cell textLabel] setText:country[#"name"]];
[[cell textLabel] setTextColor:[OmwThemes defaultColorForegroundMain]];
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
return [self sortedCountryLetters][section];
}
- (NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return [self sortedCountryLetters];
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
[tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:index] atScrollPosition:UITableViewScrollPositionTop animated:YES];
return [[self sortedCountryLetters] indexOfObject:title];
}
Section indices already shows at table view right side, but tapping do nothing.
In debug I saw that tableView:sectionForSectionIndexTitle:atIndex: method never called.
Table view is connected to datasource and delegate. I did try both plain and group table view styles.
What did I miss?
Update:
My table view look: