Swift GET request with parameters

Question

I m very new to swift  so I will probably have a lot of faults in my code but what I m trying to achieve is send a GET request to a localhost server with paramters  More so I m trying to achieve it given my function take two parameters baseURL string params NSDictionary  I am not sure how to combine those two into the actual URLRequest   Here is what I have tried so far      func sendRequest url String params NSDictionary          let urls  NSURL    NSURL string url         var request   NSMutableURLRequest URL urls         request HTTPMethod    GET         var data NSData     NSKeyedArchiver archivedDataWithRootObject params         request HTTPBody   data        println request         var session   NSURLSession sharedSession          var task   session dataTaskWithRequest request  completionHandler loadedData         task resume              func loadedData data NSData  response NSURLResponse  err NSError        if err    nil           println err  description       else          var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData data  options  NSJSONReadingOptions MutableContainers  error  nil  as NSDictionary         println jsonResult

User · Answer

I use   let dictionary     method   login user                      cel  mobile text                     password  password text   as  Dictionary lt String String gt   for  key  value  in dictionary       data data   amp   key     value        request HTTPBody   data dataUsingEncoding NSUTF8StringEncoding

User · Answer

You can extend your Dictionary to only provide stringFromHttpParameter if both key and value conform to CustomStringConvertable like this  extension Dictionary where Key   CustomStringConvertible  Value   CustomStringConvertible     func stringFromHttpParameters   - gt  String       var parametersString          for  key  value  in self         parametersString    key description         value description     amp             return parametersString         this is much cleaner and prevents accidental calls to stringFromHttpParameters on dictionaries that have no business calling that method

User · Answer

Swift 3   extension URL       func getQueryItemValueForKey key  String  - gt  String            guard let components   NSURLComponents url  self  resolvingAgainstBaseURL  false  else                 return nil                    guard let queryItems   components queryItems else   return nil        return queryItems filter                     0 name lowercased      key lowercased                      first  value           I used it to get the image name for UIImagePickerController in func imagePickerController   picker  UIImagePickerController  didFinishPickingMediaWithInfo info   String   Any     var originalFilename      if let url   info UIImagePickerControllerReferenceURL  as  URL  let imageIdentifier   url getQueryItemValueForKey key   id         originalFilename   imageIdentifier     png      print  file name     originalFilename

User · Answer

I am using this  try it in playground  Define the base urls as Struct in Constants  struct Constants        struct APIDetails           static let APIScheme    https          static let APIHost    restcountries eu          static let APIPath     rest v1 alpha            private func createURLFromParameters parameters   String Any   pathparam  String   - gt  URL        var components   URLComponents       components scheme   Constants APIDetails APIScheme     components host     Constants APIDetails APIHost     components path     Constants APIDetails APIPath     if let paramPath   pathparam           components path   Constants APIDetails APIPath      paramPath             if  parameters isEmpty           components queryItems    URLQueryItem            for  key  value  in parameters               let queryItem   URLQueryItem name  key  value     value                components queryItems  append queryItem                       return components url     let url   createURLFromParameters parameters    fullText     true    pathparam   IN      Result url  https   restcountries eu rest v1 alpha IN fullText true

User · Answer

This extension that  Rob suggested works for Swift 3 0 1  I wasn t able to compile the version he included in his post with Xcode 8 1  8B62   extension Dictionary            Build string representation of HTTP parameter dictionary of keys and objects                  returns  String representation in the form of key1 value1 amp key2 value2 where the keys and values are percent escaped      func stringFromHttpParameters   - gt  String            var parametersString              for  key  value  in self               if let key   key as  String                 let value   value as  String                   parametersString   parametersString   key         value     amp                                   parametersString   parametersString substring to  parametersString index before  parametersString endIndex           return parametersString addingPercentEncoding withAllowedCharacters   urlHostAllowed

User · Answer

When building a GET request  there is no body to the request  but rather everything goes on the URL  To build a URL  and properly percent escaping it   you can also use URLComponents    var url   URLComponents string   https   www google com search      url queryItems         URLQueryItem name   q   value   War  amp  Peace       The only trick is that most web services need   character percent escaped  because they ll interpret that as a space character as dictated by the application x-www-form-urlencoded specification   But URLComponents will not percent escape it  Apple contends that   is a valid character in a query and therefore shouldn t be escaped  Technically  they are correct  that it is allowed in a query of a URI  but it has a special meaning in application x-www-form-urlencoded requests and really should not be passed unescaped   Apple acknowledges that we have to percent escaping the   characters  but advises that we do it manually   var url   URLComponents string   https   www wolframalpha com input      url queryItems         URLQueryItem name   i   value   1 2      url percentEncodedQuery   url percentEncodedQuery  replacingOccurrences of       with    2B     This is an inelegant work-around  but it works  and is what Apple advises if your queries may include a   character and you have a server that interprets them as spaces   So  combining that with your sendRequest routine  you end up with something like   func sendRequest   url  String  parameters   String  String   completion   escaping   String  Any    Error   - gt  Void        var components   URLComponents string  url       components queryItems   parameters map    key  value  in          URLQueryItem name  key  value  value             components percentEncodedQuery   components percentEncodedQuery  replacingOccurrences of       with    2B       let request   URLRequest url  components url        let task   URLSession shared dataTask with  request    data  response  error in         guard let data   data                                is there data             let response   response as  HTTPURLResponse      is there HTTP response              200    lt  300     response statusCode             is statusCode 2XX             error    nil else                                was there no error  otherwise                     completion nil  error                  return                    let responseObject    try  JSONSerialization jsonObject with  data   as   String  Any          completion responseObject  nil            task resume       And you d call it like   sendRequest  someurl   parameters    foo    bar      responseObject  error in     guard let responseObject   responseObject  error    nil else           print error     Unknown error           return               use  responseObject  here     Personally  I d use JSONDecoder nowadays and return a custom struct rather than a dictionary  but that s not really relevant here  Hopefully this illustrates the basic idea of how to percent encode the parameters into the URL of a GET request     See previous revision of this answer for Swift 2 and manual percent escaping renditions

User · Answer

Use NSURLComponents to build your NSURL like this  var urlComponents   NSURLComponents string   https   www google de maps      urlComponents queryItems       NSURLQueryItem name   q   value  String 51 500833      String -0 141944      NSURLQueryItem name   z   value  String 6     urlComponents URL    returns https   www google de maps  q 51 500833 -0 141944 amp z 6      font  https   www ralfebert de snippets ios encoding-nsurl-get-parameters

[ios] Swift GET request with parameters

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