@import CoreText;
NSString *kanji = @"猫";
NSString *hiragana = @"ねこ";
CFStringRef furigana[kCTRubyPositionCount] =
    {(__bridge CFStringRef)hiragana, NULL, NULL, NULL};
CTRubyAnnotationRef ruby =
    CTRubyAnnotationCreate(kCTRubyAlignmentAuto, kCTRubyOverhangAuto, 0.5, furigana);

import CoreText
import Foundation

var kanji: NSString = "猫"
var hiragana: NSString = "ねこ"