var str = "哈哈哈哈哈1234"

func isIncludeChineseIn(string: String) -> Bool {

    for (_, value) in string.characters.enumerate() {

        if ("\u{4E00}" <= value  && value <= "\u{9FA5}") {
            return true
        }
    }

    return false
}

isIncludeChineseIn(str) // true