Objective-C and Swift URL encoding

Question

I have a NSString like this   http   www    but I want to transform it to   http 3A 2F 2Fwww    How can I do this

User · Answer

NSString  str    NSString   CFURLCreateStringByAddingPercentEscapes                               NULL                                CFStringRef yourString                                NULL                                CFSTR                                      kCFStringEncodingUTF8     You will need to release or autorelease str yourself

User · Answer

This is how I am doing this in swift   extension String       func encodeURIComponent   - gt  String           return self stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet URLQueryAllowedCharacterSet                func decodeURIComponent   - gt  String           return self componentsSeparatedByString      joinWithSeparator      stringByRemovingPercentEncoding

User · Answer

This is not my solution  Someone else wrote in stackoverflow but I have forgotten how   Somehow this solution works  well   It handles diacritic  chinese characters  and pretty much anything else   -  NSString    URLEncodedString       NSMutableString   output    NSMutableString string       const char   source    self UTF8String       int sourceLen   strlen source       for  int i   0  i  lt  sourceLen    i            const unsigned char thisChar    const unsigned char source i           if  false  amp  amp  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      If someone would tell me who wrote this code  I ll really appreciate it  Basically he has some explanation why this encoded string will decode exactly as it wish   I modified his solution a little  I like space to be represented with  20 rather than    That s all

User · Answer

Google implements this in their Google Toolbox for Mac  So that s a good place to peak how they re doing it  Another option is to include the Toolbox and use their implementation    Checkout the implementation here   Which comes down to exactly what people have been posting here

User · Answer

To escape the characters you want is a little more work   Example code     iOS7 and above    NSString  unescaped     http   www   NSString  escapedString    unescaped stringByAddingPercentEncodingWithAllowedCharacters  NSCharacterSet URLHostAllowedCharacterSet    NSLog   escapedString       escapedString     NSLog output      escapedString  http 3A 2F 2Fwww   The following are useful URL encoding character sets   URLFragmentAllowedCharacterSet      lt  gt          URLHostAllowedCharacterSet           lt  gt          URLPasswordAllowedCharacterSet        lt  gt            URLPathAllowedCharacterSet           lt  gt           URLQueryAllowedCharacterSet         lt  gt          URLUserAllowedCharacterSet            lt  gt           Creating a characterset combining all of the above   NSCharacterSet  URLCombinedCharacterSet     NSCharacterSet characterSetWithCharactersInString           lt  gt               invertedSet     Creating a Base64   In the case of Base64 characterset     NSCharacterSet  URLBase64CharacterSet     NSCharacterSet characterSetWithCharactersInString       n   invertedSet        For Swift 3 0    var escapedString   originalString addingPercentEncoding withAllowedCharacters  urlHostAllowed       For Swift 2 x    var escapedString   originalString stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet URLHostAllowedCharacterSet      Note  stringByAddingPercentEncodingWithAllowedCharacters will also encode UTF-8 characters needing encoding      Pre iOS7 use Core Foundation   Using Core Foundation With ARC      NSString  escapedString    NSString   CFBridgingRelease CFURLCreateStringByAddingPercentEscapes      NULL        bridge CFStringRef  unescaped      NULL      CFSTR           amp                      kCFStringEncodingUTF8      Using Core Foundation Without ARC     NSString  escapedString    NSString   CFURLCreateStringByAddingPercentEscapes      NULL      CFStringRef unescaped      NULL      CFSTR           amp                      kCFStringEncodingUTF8     Note  -stringByAddingPercentEscapesUsingEncoding will not produce the correct encoding  in this case it will not encode anything returning the same string   stringByAddingPercentEscapesUsingEncoding NSUTF8StringEncoding encodes 14 characrters                    lt   plus the space character as percent escaped      testString                amp      -              lt   gt    AZaz      encodedString       20 60    23  25 5E amp      -  7B 7D 5B 5D 7C 5C   22  3C  3E   AZaz      Note  consider if this set of characters meet your needs  if not change them as needed   RFC 3986 characters requiring encoding    added since it is the encoding prefix character              amp                    Some  unreserved characters  are additionally encoded          n r    -  lt

User · Answer

Swift iOS   Just For Information   I have used this   extension String        func urlEncode   - gt  CFString           return CFURLCreateStringByAddingPercentEscapes              nil              self              nil                        amp                          CFStringBuiltInEncodings UTF8 rawValue                      end extension String

User · Answer

int strLength   0  NSString  urlStr     http   www   NSLog    urlStr        urlStr    NSMutableString  mutableUrlStr    urlStr mutableCopy   NSLog    mutableUrlStr        mutableUrlStr    strLength    mutableUrlStr length    mutableUrlStr replaceOccurrencesOfString      withString    3A  options NSCaseInsensitiveSearch range NSMakeRange 0  strLength    NSLog    mutableUrlStr        mutableUrlStr    strLength    mutableUrlStr length    mutableUrlStr replaceOccurrencesOfString      withString    2F  options NSCaseInsensitiveSearch range NSMakeRange 0  strLength    NSLog    mutableUrlStr        mutableUrlStr

User · Answer

Here s what I use  Note you have to use the  autoreleasepool feature or the program might crash or lockup the IDE  I had to restart my IDE three times until I realized the fix  It appears that this code is ARC compliant   This question has been asked many times  and many answers given  but sadly all of the ones selected  and a few others suggested  are wrong   Here s the test string that I used  This is my 123  test  amp  test2  Got it    These are my Objective C   class methods   static NSString   urlDecode NSString  stringToDecode        NSString  result    stringToDecode stringByReplacingOccurrencesOfString      withString            result    result stringByReplacingPercentEscapesUsingEncoding NSUTF8StringEncoding       return result     static NSString   urlEncode NSString  stringToEncode         autoreleasepool           NSString  result    NSString   CFBridgingRelease CFURLCreateStringByAddingPercentEscapes                  NULL                   CFStringRef stringToEncode                  NULL                   CFStringRef              amp                                kCFStringEncodingUTF8                         result    result stringByReplacingOccurrencesOfString    20  withString                return result

User · Answer

NSString   encodedString    NSString   CFURLCreateStringByAddingPercentEscapes NUL  CFStringRef   parameter  NULL  CFStringRef           amp             -    kCFStringEncodingUTF8     NSURL   url     NSURL alloc  initWithString    address here  stringByAppendingFormat    cid     encodedString  nil

User · Answer

use NSString instance method like this      NSString   encodeURIComponent  NSString   string   NSString  s    string stringByAddingPercentEscapesUsingEncoding NSUTF8StringEncoding   return s        NSString   decodeURIComponent  NSString   string   NSString  s    string stringByReplacingPercentEscapesUsingEncoding NSUTF8StringEncoding   return s      remember you should only do encode or decode for your parameter value  not all the url you request

User · Answer

It s called URL encoding   More here   - NSString   urlEncodeUsingEncoding  NSStringEncoding encoding       return  NSString   CFURLCreateStringByAddingPercentEscapes NULL              CFStringRef self             NULL              CFStringRef              amp                           CFStringConvertNSStringEncodingToEncoding encoding

User · Answer

This can work in Objective C ARC Use CFBridgingRelease to cast a Core Foundation-style object as an Objective-C object and transfer ownership of the object to ARC  See Function CFBridgingRelease here      NSString   encodeUrlString  NSString   string   return CFBridgingRelease CFURLCreateStringByAddingPercentEscapes                           kCFAllocatorDefault                               bridge CFStringRef string                            NULL                            CFSTR           amp                                         kCFStringEncodingUTF8

[ios] Objective-C and Swift URL encoding

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