How do I URL encode a string

Question

I have a URL string  NSString  with spaces and  amp  characters   How do I url encode the entire string  including the  amp  ampersand character and spaces

User · Answer

In swift 3      exclude alpha and numeric     full  encoding stringUrl   stringUrl addingPercentEncoding withAllowedCharacters   alphanumerics        exclude hostname and symbols  amp    and etc stringUrl   stringUrl addingPercentEncoding withAllowedCharacters   urlHostAllowed

User · Answer

Here s a production-ready flexible approach in Swift 5 x   public extension CharacterSet        static let urlQueryParameterAllowed   CharacterSet urlQueryAllowed subtracting CharacterSet charactersIn    amp           static let urlQueryDenied             CharacterSet urlQueryAllowed inverted       static let urlQueryKeyValueDenied     CharacterSet urlQueryParameterAllowed inverted       static let urlPathDenied              CharacterSet urlPathAllowed inverted       static let urlFragmentDenied          CharacterSet urlFragmentAllowed inverted       static let urlHostDenied              CharacterSet urlHostAllowed inverted        static let urlDenied                  CharacterSet urlQueryDenied          union  urlQueryKeyValueDenied           union  urlPathDenied           union  urlFragmentDenied           union  urlHostDenied        func inverted   - gt  CharacterSet           var copy   self         copy invert           return copy            public extension String       func urlEncoded denying deniedCharacters  CharacterSet    urlDenied  - gt  String            return addingPercentEncoding withAllowedCharacters  deniedCharacters inverted              Example usage   print  Hello  World   urlEncoded     print  You amp Me   urlEncoded     print   Blessed 100   urlEncoded     print  Pride and Prejudice  urlEncoded denying   uppercaseLetters      Output   Hello  20World  You 26Me 3F  23Blessed 20100 25  50ride and  50rejudice

User · Answer

This might be helpful  NSString  sampleUrl     http   www google com search jsp params Java Developer   NSString  encodedUrl    sampleUrl stringByAddingPercentEscapesUsingEncoding   NSUTF8StringEncoding     For iOS 7   the recommended way is   NSString  encodedUrl    sampleUrl stringByAddingPercentEncodingWithAllowedCharacters  NSCharacterSet URLQueryAllowedCharacterSet      You can choose the allowed character set as per the requirement of the URL component

User · Answer

Unfortunately  stringByAddingPercentEscapesUsingEncoding doesn t always work 100    It encodes non-URL characters but leaves the reserved characters  like slash   and ampersand  amp   alone   Apparently this is a bug that Apple is aware of  but since they have not fixed it yet  I have been using this category to url-encode a string    implementation NSString  NSString Extended   -  NSString   urlencode       NSMutableString  output    NSMutableString string       const unsigned char  source    const unsigned char    self UTF8String       int sourceLen   strlen  const char   source       for  int i   0  i  lt  sourceLen    i            const unsigned char thisChar   source i           if  thisChar                       output appendString                  else if  thisChar           thisChar     -     thisChar           thisChar                                thisChar  gt    a   amp  amp  thisChar  lt    z                          thisChar  gt    A   amp  amp  thisChar  lt    Z                          thisChar  gt    0   amp  amp  thisChar  lt    9                   output appendFormat    c   thisChar             else                output appendFormat      02X   thisChar                       return output      Used like this   NSString  urlEncodedString      SOME URL GOES HERE  urlencode       Or  with an already existing string  NSString  someUrlString     someURL   NSString  encodedUrlStr    someUrlString urlencode       This also works   NSString  encodedString    NSString   CFURLCreateStringByAddingPercentEscapes                              NULL                               CFStringRef unencodedString                              NULL                               CFStringRef            amp                                          kCFStringEncodingUTF8        Some good reading about the subject   Objective-c iPhone percent encode a string  Objective-C and Swift URL encoding    http   cybersam com programming proper-url-percent-encoding-in-ios https   devforums apple com message 15674 15674  http   simonwoodside com weblog 2009 4 22 how to really url encode

User · Answer

ios 7 update  NSString  encode    string stringByAddingPercentEncodingWithAllowedCharacters  NSCharacterSet URLQueryAllowedCharacterSet     NSString  decode    encode stringByReplacingPercentEscapesUsingEncoding NSUTF8StringEncoding

User · Answer

Swift 2 0 Example  iOS 9 Compatiable   extension String      func stringByURLEncoding   - gt  String         let characters   NSCharacterSet URLQueryAllowedCharacterSet   mutableCopy   as  NSMutableCharacterSet      characters removeCharactersInString   amp         guard let encodedString   self stringByAddingPercentEncodingWithAllowedCharacters characters  else         return nil            return encodedString

User · Answer

For individual www form-encoded query parameters  I made a category on NSString   -  NSString  WWWFormEncoded       NSMutableCharacterSet  chars   NSCharacterSet alphanumericCharacterSet mutableCopy        chars addCharactersInString             NSString  encodedString    self stringByAddingPercentEncodingWithAllowedCharacters chars        encodedString    encodedString stringByReplacingOccurrencesOfString      withString             return encodedString

User · Answer

New APIs have been added since the answer was selected  You can now use NSURLUtilities  Since different parts of URLs allow different characters  use the applicable character set  The following example encodes for inclusion in the query string   encodedString    myString stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet URLQueryAllowedCharacterSet     To specifically convert   amp    you ll need to remove it from the url query set or use a different set  as   amp   is allowed in a URL query   NSMutableCharacterSet  chars   NSCharacterSet URLQueryAllowedCharacterSet mutableCopy   chars removeCharactersInRange NSMakeRange   amp    1        26 encodedString    myString stringByAddingPercentEncodingWithAllowedCharacters chars

User · Answer

This one is working for me   func stringByAddingPercentEncodingForFormData plusForSpace  Bool false  - gt  String        let unreserved     -        let allowed   NSMutableCharacterSet alphanumericCharacterSet       allowed addCharactersInString unreserved       if plusForSpace           allowed addCharactersInString                 var encoded   stringByAddingPercentEncodingWithAllowedCharacters allowed      if plusForSpace           encoded   encoded  stringByReplacingOccurrencesOfString                                                                      withString                 return encoded     I found the above function from this link  http   useyourloaf com blog how-to-percent-encode-a-url-string   You can also use this function with swift extension  Please let me know if there is any issue

User · Answer

For the php function urlencode encoding a NSString to a cString with UTF8Encode  like  NSString UTF8String  was not working  Here is my custom objective c NSString ASCIIencode Category with works with all ASCII values 0  255 Header  import  lt Cocoa Cocoa h gt    interface NSString  ASCIIEncode   -  const char  ASCIIEncode    end  Implementation  import  quot NSString ASCIIEncode h quot    implementation NSString  ASCIIEncode   -  const char  ASCIIEncode            static char output 1024               https   tools piex at ascii-tabelle         https   www ionos de digitalguide server knowhow ascii-american-standard-code-for-information-interchange           NSMutableArray  ascii    NSMutableArray new      Hex    000                          Dez Hex      ascii addObject   quot  0 quot       000 000 NUL      ascii addObject    1       001 001 SOH      ascii addObject    2       002 002 STX      ascii addObject    3       003 003 ETX      ascii addObject    4       004 004 EOT      ascii addObject    5       005 005 ENQ      ascii addObject    6       006 006 ACK      ascii addObject   quot  a quot       007 007 BEL      ascii addObject   quot  b quot       008 008 BS      ascii addObject    9       009 009 TAB      ascii addObject   quot  n quot       010 00A LF      ascii addObject   11       011 00B VT      ascii addObject   12       012 00C FF      ascii addObject   quot  r quot       013 00D CR      ascii addObject   14       014 00E SO      ascii addObject   15       015 00F NAK    010      ascii addObject   16       016 010 DLE      ascii addObject   17       017 011 DC1      ascii addObject   18       018 012 DC2      ascii addObject   19       019 013 DC3      ascii addObject   20       020 014 DC4      ascii addObject   21       021 015 NAK      ascii addObject   22       022 016 SYN      ascii addObject   23       023 017 ETB      ascii addObject   24       024 018 CAN      ascii addObject   25       025 019 EM      ascii addObject   26       026 01A 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                    unsigned char c    unsigned char asciiIdx                  output i    c                  break                                                         Don t forget string termination     output i    0       return  const char   amp output 0       end

User · Answer

swift code based on chown s objc answer in this thread     extension String       func urlEncode   - gt  String           return CFURLCreateStringByAddingPercentEscapes              nil              self              nil                        amp                          CFStringBuiltInEncodings UTF8 rawValue

User · Answer

- NSString   encodeUrlString  NSString   string     return CFBridgingRelease                      CFURLCreateStringByAddingPercentEscapes                          kCFAllocatorDefault                             bridge CFStringRef string                          NULL                          CFSTR           amp                                       kCFStringEncodingUTF8                             according to the following blog

User · Answer

In my case where the last component was Arabic letters I did the following in Swift 2 2   extension String     func encodeUTF8   - gt  String           If I can create an NSURL out of the string nothing is wrong with it     if let     NSURL string  self             return self              Get the last component from the string this will return subSequence     let optionalLastComponent   self characters split    0          last       if let lastComponent   optionalLastComponent              Get the string from the sub sequence by mapping the characters to  String  then reduce the array to String         let lastComponentAsString   lastComponent map   String  0    reduce     combine                 Get the range of the last component         if let rangeOfLastComponent   self rangeOfString lastComponentAsString                  Get the string without its last component             let stringWithoutLastComponent   self substringToIndex rangeOfLastComponent startIndex                  Encode the last component             if let lastComponentEncoded   lastComponentAsString stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet alphanumericCharacterSet                      Finally append the original string  without its last component  to the encoded part  encoded last component              let encodedString   stringWithoutLastComponent   lastComponentEncoded                    Return the string  original string encoded string                  return encodedString                                    return nil        usage   let stringURL    http   xxx dev com endpoint nonLatinCharacters   if let encodedStringURL   stringURL encodeUTF8          if let url   NSURL string  encodedStringURL

User · Answer

I faced a similar problem passing complex strings as a POST parameter  My strings can contain Asian characters  spaces  quotes and all sorts of special characters  The solution I eventually found was to convert my string into the matching series of unicodes  e g   Hu0040Hu0020Hu03f5      using  NSString stringWithFormat   Hu 04x   string characterAtIndex i   to get the Unicode from each character in the original string  The same can be done in Java   This string can be safely passed as a POST parameter   On the server side  PHP   I change all the  H  to     and I pass the resulting string to json decode  Final step is to escape single quotes before storing the string into MySQL   This way I can store any UTF8 string on my server

User · Answer

Use NSURLComponents to encode HTTP GET parameters       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   http   www ralfebert de snippets ios encoding-nsurl-get-parameters

User · Answer

So many answers but didn t work for me  so I tried the following   fun simpleServiceCall for serviceUrl  String  appendToUrl  String         let urlString  String   serviceUrl   appendToUrl addingPercentEncoding withAllowedCharacters   urlPathAllowed             let finalUrl   URL string  urlString          continue to execute your service call         Hopefully it ll help someone  thanks

User · Answer

This is without test  NSMutableCharacterSet  set     NSCharacterSet alphanumericCharacterSet  mutableCopy    set addCharactersInString   -       NSString  encode    test stringByAddingPercentEncodingWithAllowedCharacters set

User · Answer

After reading all the answers for this topic and the  wrong  accepted one  I want to add my contribution   IF the target is iOS7   and in 2017 it should since XCode makes really hard to deliver compatibility under iOS8  the best way  thread safe  fast  amd will full UTF-8 support to do this is    Objective C code    implementation NSString  NSString urlencoding   -  NSString   urlencode       static NSMutableCharacterSet  chars   nil      static dispatch once t pred       if  chars          return  self stringByAddingPercentEncodingWithAllowedCharacters chars           to be thread safe     dispatch once  amp pred             chars   NSCharacterSet URLQueryAllowedCharacterSet mutableCopy           chars removeCharactersInString            amp                           return  self stringByAddingPercentEncodingWithAllowedCharacters chars      end   This will extend NSString  will exclude RFC forbidden characters  support UTF-8 characters  and let you use things like   NSString  myusername    I m evil  amp want to break    - gt              NSLog   Source     - gt  Dest       myusername   myusername urlencode      That will print on your debug console      Source  I m evil  amp want to break    -            -  Dest  I 27m 5Bevil 5D 26want 28to 29break 21 21 21 24- 3E C3 A0 C3 A9 C3 AC C3 B2 C3 B9       note also the use of dispatch once to avoid multiple initializations in multithread environments

User · Answer

In Swift 3  please try out below   let stringURL    YOUR URL TO BE ENCODE   let encodedURLString   stringURL addingPercentEncoding withAllowedCharacters   urlHostAllowed  print encodedURLString    Since  stringByAddingPercentEscapesUsingEncoding encodes non URL characters but leaves the reserved characters  like          amp              You can encode the url like the following code   let stringURL    YOUR URL TO BE ENCODE   let characterSetTobeAllowed    CharacterSet charactersIn            amp               inverted  if let encodedURLString   stringURL addingPercentEncoding withAllowedCharacters  characterSetTobeAllowed        print encodedURLString

User · Answer

This code helped me for encoding special characters  NSString  encPassword    password stringByAddingPercentEncodingWithAllowedCharacters  NSCharacterSet alphanumericCharacterSet

User · Answer

Try to use stringByAddingPercentEncodingWithAllowedCharacters method with  NSCharacterSet URLUserAllowedCharacterSet  it will cover all the cases  Objective C  NSString  value     Test   Test   value    value stringByAddingPercentEncodingWithAllowedCharacters  NSCharacterSet URLUserAllowedCharacterSet      swift             var value    Test   Test  value stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet URLUserAllowedCharacterSet      Output  Test 20 2F 20Test

User · Answer

Apple s advice  in the 10 11 release notes  is   If you need to percent-encode an entire URL string  you can use this code to encode a NSString intended to be a URL  in urlStringToEncode    NSString  percentEncodedURLString       NSURL URLWithDataRepresentation  urlStringToEncode dataUsingEncoding NSUTF8StringEncoding  relativeToURL nil  relativeString

User · Answer

I opted to use the CFURLCreateStringByAddingPercentEscapes call as given by accepted answer  however in newest version of XCode  and IOS   it resulted in an error  so used the following instead   NSString  apiKeyRaw     79b 7Qd jW    fv M amp W0O 3CENnrbNh4 2E - J BCjCMrWy dSfGs A6N38Fo     NSString  apiKey    NSString   CFBridgingRelease CFURLCreateStringByAddingPercentEscapes NULL   CFStringRef apiKeyRaw  NULL   CFStringRef            amp              kCFStringEncodingUTF8

[ios] How do I URL encode a string

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