/// 音调
public enum ToneType {
    case none // 不带音调
    case toneNumber // 带音调
}

/// v的样式
public enum VCharType {
    case vCharacter // u: -> v
    case uUnicode // u: -> ü
    case uAndColon // u: -> u:
}

/// 字母样式
public enum LetterType {
    case lowercased // 小写
    case uppercased // 大写
    case capitalized // 首字母大写
}

// 定义拼音输出格式
let outputFormat = NNPinyinOutputFormat(toneType: .toneNumber, vCharType: .uAndColon, letterType: .uppercased)

debugPrint("绿色".toPinyin())
// "lv se"
var outputFormat = NNPinyinOutputFormat(vCharType: .uUnicode)
debugPrint("绿色".toPinyin(withFormat: outputFormat))
// "lü se"
outputFormat = NNPinyinOutputFormat(toneType: .toneNumber, vCharType: .uAndColon, letterType: .uppercased)
debugPrint("绿色".toPinyin(withFormat: outputFormat))
// "LU:4 SE4"
debugPrint("你在幹什麼".toPinyinAcronym())
// "nzgsm"
debugPrint("Hello".toPinyin())
// "Hello"
debugPrint("测试dasdasd".hasChineseCharacter)
// true