Ios swift中的URL编码

请帮我在Swift 3上做同样的

curl -X POST -d MD='44586989' -d TermUrl='https://proil.moscow/' --data-urlencode 'PaReq=+/eyJNZXJjaGFudE5hbWUiOm51bGwsIkZpcnN0U2l4IjoiNDI3NjM4IiwiTGFzdEZvdXIiOiIxMTQ1IiwiQW1vdW50IjoxMDM0LjAwLCJDdXJyZW5jeUNvZGUiOiJSVUIiLCJEYXRlIjoiMjAxOC0wMy0yNlQwMDowMDowMCswMzowMCIsIkN1c3RvbWVyTmFtZSI6bnVsbCwiQ3VsdHVyZU5hbWUiOiJydS1SVSJ9' https://demo.cloudpayments.ru/acs

我试试这个：

 var request = URLRequest(url: URL(string: acsUrlString)!)
    request.httpMethod = "POST"
    let session = URLSession.shared


    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    let d = String("PaReq=" + pareq + "&MD=" + String(Int(transactionId)) +  "&TermUrl=https://proil.moscow").data(using:String.Encoding.ascii, allowLossyConversion: false)
    request.httpBody = d

其中，不带编码的d=

PaReq=+/eyjnzxjjagfude5HBWuIOM51BGWSIKZPCNN0U2L4IJINDI3Nj4IIWITzDzVdXIIOIIXMTq1IWIQW1VDW50IjOxMDM0LjawlcjDxJyZW5JeunvuIjJwJuIjVuIzIjAxOc0YWm0YNqLqWmWnqLqLqLqWbWvVvYZU5HBWuIoIjIjIjIjIjIjW9LjJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ=https://proil.moscow

所以这段代码给出的结果与

curl -X POST -d MD='44586989' -d TermUrl='https://proil.moscow/' -d PaReq='+/eyJNZXJjaGFudE5hbWUiOm51bGwsIkZpcnN0U2l4IjoiNDI3NjM4IiwiTGFzdEZvdXIiOiIxMTQ1IiwiQW1vdW50IjoxMDM0LjAwLCJDdXJyZW5jeUNvZGUiOiJSVUIiLCJEYXRlIjoiMjAxOC0wMy0yNlQwMDowMDowMCswMzowMCIsIkN1c3RvbWVyTmFtZSI6bnVsbCwiQ3VsdHVyZU5hbWUiOiJydS1SVSJ9' https://demo.cloudpayments.ru/acs

---

我从服务器cloudpayments得到这样的响应：“检查PaReq参数中的“+”符号。”，

谢谢你，Rob，这对我很有帮助

request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = postParameters.map { key, value in
   let keyString = key.addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)!
   let valueString = (value as! String).addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)!
   return keyString + "=" + valueString
}.joined(separator: "&").data(using: .utf8)

和扩展

extension CharacterSet {

static var urlQueryValueAllowed: CharacterSet = {
    let generalDelimitersToEncode = ":#[]@" // does not include "?" or "/" due to RFC 3986 - Section 3.4
    let subDelimitersToEncode = "!$&'()*+,;="

    var allowed = CharacterSet.urlQueryAllowed
    allowed.remove(charactersIn: generalDelimitersToEncode + subDelimitersToEncode)

    return allowed
}()
}

---

请向社区提供您所面临的任何错误或问题，如果没有这些错误或问题，很难猜测失败的地方。@StefanCrain我从服务器cloudpayments得到以下响应：“检查PaReq参数中的“+”符号”。您必须对添加到POST请求正文中的值进行百分比编码。例如。值得注意的是，

+

字符可能会有问题，因为大多数web服务根据

x-www-form-urlencoded

规范将它们替换为空格字符。@MiKa您使用UIWebView和WKWebView做什么？