Swift URL指定字符encoding

1.指定支付encoding

["/","=","?","&"].forEach({ (char) in
    let custom = CharacterSet(charactersIn: char).inverted
    lastPath = lastPath.addingPercentEncoding(withAllowedCharacters: custom) ?? ""
})

2.指定字符不被encoding

var charSet = CharacterSet.urlQueryAllowed
["#"].forEach({ (char) in
    charSet.insert(charactersIn: char)
})
url = url.addingPercentEncoding(withAllowedCharacters: charSet)!