import Foundation
extension String {
public func hiraganaToKatakana() -> String {
if #available(iOS 9.0, *) {
guard let prefLang = Locale.preferredLanguages.first else { return self }
if prefLang.hasPrefix("ja") {
// 言語設定が日本語の時のみ
if let kana = self.applyingTransform(.hiraganaToKatakana, reverse: false) {
return kana
} else {
return self
}
} else {
return self
}
} else {
return self
}
}
public func katakanaFurigana() -> String {
guard let prefLang = Locale.preferredLanguages.first else { return "" }
if prefLang.hasPrefix("ja") {
// 言語設定が日本語の時のみ
let inputText: NSString = self as NSString
let furigana = NSMutableString()
let range: CFRange = CFRangeMake(0, inputText.length)
let locale: CFLocale = CFLocaleCopyCurrent()
let tokenizer: CFStringTokenizer = CFStringTokenizerCreate(kCFAllocatorDefault, inputText as CFString, range, kCFStringTokenizerUnitWordBoundary, locale)
var tokenType: CFStringTokenizerTokenType = CFStringTokenizerGoToTokenAtIndex(tokenizer, 0)
while tokenType != CFStringTokenizerTokenType(rawValue: 0) {
let latin: CFTypeRef = CFStringTokenizerCopyCurrentTokenAttribute(tokenizer, kCFStringTokenizerAttributeLatinTranscription)
guard let romanAlphabet: NSMutableString = latin as? NSMutableString else { continue }
CFStringTransform(romanAlphabet as CFMutableString, nil, kCFStringTransformLatinHiragana, false)
furigana.append(romanAlphabet as String)
tokenType = CFStringTokenizerAdvanceToNextToken(tokenizer)
}
let outputText: String = furigana as String
return outputText.hiraganaToKatakana()
} else {
return ""
}
}
}
