How to escape the HTTP params in Swift

Question

I\'m trying to make a post to an HTTP server

By the way this is my code:

  func sendPostToUrl(url:String, withParams params: [String: String?] ) {
          


        

Answer 1

If you can target iOS 8 (thanks @Rob), use NSURLComponents to escape your parameters instead:

import Foundation

func encodeParameters(#params: [String: String]) -> String {
    var queryItems = map(params) { NSURLQueryItem(name:$0, value:$1)}
    var components = NSURLComponents()
    components.queryItems = queryItems
    return components.percentEncodedQuery ?? ""
}

Now encodeParameters(params:["hello":"world","inject":"param1=value1¶m2=value2"]) returns hello=world&inject=param1%3Dvalue1%26param2%3Dvalue2 as you would expect.

Otherwise, the best way to create the character set that will let you escape your values properly is this:

var safeCharacterSet = NSCharacterSet.URLQueryAllowedCharacterSet().mutableCopy()
safeCharacterSet.removeCharactersInString("&=")

and see @rintaro's answer to use filter/map properly to perform the encoding in a nice way.