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    <p>Unfortunately, <code>stringByAddingPercentEscapesUsingEncoding</code> doesn't always work 100%. It encodes non-URL characters but leaves the reserved characters (like slash <code>/</code> and ampersand <code>&amp;</code>) alone. Apparently this is a <em>bug</em> that Apple is aware of, but since they have not fixed it yet, I have been using this category to url-encode a string:</p> <pre><code>@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; } </code></pre> <p>Used like this:</p> <pre><code>NSString *urlEncodedString = [@"SOME_URL_GOES_HERE" urlencode]; // Or, with an already existing string: NSString *someUrlString = @"someURL"; NSString *encodedUrlStr = [someUrlString urlencode]; </code></pre> <hr> <p>This also works:</p> <pre><code>NSString *encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes( NULL, (CFStringRef)unencodedString, NULL, (CFStringRef)@"!*'();:@&amp;=+$,/?%#[]", kCFStringEncodingUTF8 ); </code></pre> <hr> <p>Some good reading about the subject:</p> <p><a href="https://stackoverflow.com/q/3423545/836407">Objective-c iPhone percent encode a string?</a><br> <a href="https://stackoverflow.com/q/8086584/836407">Objective-C and Swift URL encoding</a> </p> <p><a href="http://cybersam.com/programming/proper-url-percent-encoding-in-ios" rel="noreferrer">http://cybersam.com/programming/proper-url-percent-encoding-in-ios</a><br> <a href="https://devforums.apple.com/message/15674#15674" rel="noreferrer">https://devforums.apple.com/message/15674#15674</a> <a href="http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/" rel="noreferrer">http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/</a> </p>
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    1. POHow do I URL encode a string
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    1. COWhy on earth would you use a complicated category like this rather than just dropping down to [CFURLCreateStringByAddingPercentEscapes()](http://developer.apple.com/library/ios/documentation/CoreFoundation/Reference/CFURLRef/Reference/reference.html#//apple_ref/doc/uid/20001206-CH1g-F16659), where you can explicitly specify which characters you want to always escape.
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      1. USKevin Ballard
    2. COYeah, it is common, not to many ways to code it. I probably got it from the new years ago, just now fro my code. That there were two similar questions only hours apart, I suspect it was class homework. :-)
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    3. CO@KevinBallard because the CF function works on an inclusive model ("escape these characters"), and usually you want to work on an exclusive model ("escape everything *except* these characters")
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      1. USDave DeLong
 

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