blocks|key|517714|text|它被称为URL+encoding。更多here。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|517715|-(NSString+*)urlEncodeUsingEncoding:(NSStringEncoding)encoding+{
++++return+(NSString+*)CFURLCreateStringByAddingPercentEscapes(NULL,
+++++++++++(CFStringRef)self,
+++++++++++NULL,
+++++++++++(CFStringRef)@"!*'\"();:@&=%2B$,/?%25#[]%25+",
+++++++++++CFStringConvertNSStringEncodingToEncoding(encoding));
}|code-block|syntax|javascript|517716|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3schools.com/tags/ref_urlencode.asp|1|http://madebymany.com/blog/url-encoding-an-nsstring-on-ios^0|4|C|0|J|4|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

It's called <a href="http://www.w3schools.com/tags/ref_urlencode.asp">URL encoding</a>. More <a href="http://madebymany.com/blog/url-encoding-an-nsstring-on-ios">here</a>.

<pre><code>-(NSString *)urlEncodeUsingEncoding:(NSStringEncoding)encoding {
 return (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,
 (CFStringRef)self,
 NULL,
 (CFStringRef)@"!*'\"();:@&amp;=+$,/?%#[]% ",
 CFStringConvertNSStringEncodingToEncoding(encoding));
}
</code></pre>

blocks|key|517780|text|NSString+*str+=+(NSString+*)CFURLCreateStringByAddingPercentEscapes(
+++++++++++++++++++++++++++++NULL,
+++++++++++++++++++++++++++++(CFStringRef)yourString,+
+++++++++++++++++++++++++++++NULL,+
+++++++++++++++++++++++++++++CFSTR("/:"),+
+++++++++++++++++++++++++++++kCFStringEncodingUTF8);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|517781|您需要自己释放或自动释放str。|unstyled|offset|length|style|CODE|517782|entityMap^0|0|C|3|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>NSString *str = (NSString *)CFURLCreateStringByAddingPercentEscapes(
 NULL,
 (CFStringRef)yourString, 
 NULL, 
 CFSTR("/:"), 
 kCFStringEncodingUTF8);
</code></pre>

You will need to release or autorelease <code>str</code> yourself.

blocks|key|734177|text|int+strLength+=+0;
NSString+*urlStr+=+@"http://www";
NSLog(@"+urlStr+:+%25@",+urlStr+);
NSMutableString+*mutableUrlStr+=+[urlStr+mutableCopy];
NSLog(@"+mutableUrlStr+:+%25@",+mutableUrlStr+);
strLength+=+[mutableUrlStr+length];
[mutableUrlStr+replaceOccurrencesOfString:@":"+withString:@"%253A"+options:NSCaseInsensitiveSearch+range:NSMakeRange(0,+strLength)];
NSLog(@"+mutableUrlStr+:+%25@",+mutableUrlStr+);
strLength+=+[mutableUrlStr+length];
[mutableUrlStr+replaceOccurrencesOfString:@"/"+withString:@"%252F"+options:NSCaseInsensitiveSearch+range:NSMakeRange(0,+strLength)];
NSLog(@"+mutableUrlStr+:+%25@",+mutableUrlStr+);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|734178|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>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 );
</code></pre>

blocks|key|734190|text|+NSString+*+encodedString+=+(NSString+*)CFURLCreateStringByAddingPercentEscapes(NUL,(CFStringRef)@"parameter",NULL,(CFStringRef)@"!*'();@&%2B$,/?%25#[]~=_-.:",kCFStringEncodingUTF8+);

NSURL+*+url+=+[[NSURL+alloc]+initWithString:[@"address+here"+stringByAppendingFormat:@"?cid=%25@",encodedString,+nil]];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|734191|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NUL,(CFStringRef)@"parameter",NULL,(CFStringRef)@"!*'();@&amp;+$,/?%#[]~=_-.:",kCFStringEncodingUTF8 );

NSURL * url = [[NSURL alloc] initWithString:[@"address here" stringByAppendingFormat:@"?cid=%@",encodedString, nil]];
</code></pre>

blocks|key|734242|text|这不是我的解决方案。别人用stackoverflow写的，但我忘了是怎么写的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734243|不知何故，这个解决方案工作得“很好”。它可以处理发音符号、中文字符以及几乎任何其他字符。|734244|-+(NSString+*)+URLEncodedString+{
++++NSMutableString+*+output+=+[NSMutableString+string];
++++const+char+*+source+=+[self+UTF8String];
++++int+sourceLen+=+strlen(source);
++++for+(int+i+=+0;+i+<+sourceLen;+%2B%2Bi)+{
++++++++const+unsigned+char+thisChar+=+(const+unsigned+char)source[i];
++++++++if+(false+&&+thisChar+==+'+'){
++++++++++++[output+appendString:@"%2B"];
++++++++}+else+if+(thisChar+==+'.'+%7C%7C+thisChar+==+'-'+%7C%7C+thisChar+==+'_'+%7C%7C+thisChar+==+'~'+%7C%7C
+++++++++++++++++++(thisChar+>=+'a'+&&+thisChar+<=+'z')+%7C%7C
+++++++++++++++++++(thisChar+>=+'A'+&&+thisChar+<=+'Z')+%7C%7C
+++++++++++++++++++(thisChar+>=+'0'+&&+thisChar+<=+'9'))+{
++++++++++++[output+appendFormat:@"%25c",+thisChar];
++++++++}+else+{
++++++++++++[output+appendFormat:@"%25%25%2502X",+thisChar];
++++++++}
++++}
++++return+output;
}|code-block|syntax|javascript|734245|如果有人能告诉我这段代码是谁写的，我将不胜感激。基本上，他有一些解释，为什么这个编码的字符串将完全按照它所希望的那样解码。|734246|我对他的解决方案做了一点修改。我喜欢用%2520而不是%2B表示空格。就这样。|734247|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

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.

<pre><code>- (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;
}
</code></pre>

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.

blocks|key|734303|text|//使用NSString实例方法如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734304|%2B+(NSString+*)encodeURIComponent:(NSString+*)string
{
NSString+*s+=+[string+stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
return+s;
}

%2B+(NSString+*)decodeURIComponent:(NSString+*)string
{
NSString+*s+=+[string+stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
return+s;
}|code-block|syntax|javascript|734305|请记住，您应该只对参数值进行编码或解码，而不是对请求的所有url进行编码或解码。|734306|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

//use NSString instance method like this:

<pre><code>+ (NSString *)encodeURIComponent:(NSString *)string
{
NSString *s = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
return s;
}

+ (NSString *)decodeURIComponent:(NSString *)string
{
NSString *s = [string stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
return s;
}
</code></pre>

remember,you should only do encode or decode for your parameter value, not all the url you request.

blocks|key|517977|text|Swift+iOS：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|517978|仅供参考:我使用了以下内容：|517979|extension+String+{

++++func+urlEncode()+->+CFString+{
++++++++return+CFURLCreateStringByAddingPercentEscapes(
++++++++++++nil,
++++++++++++self,
++++++++++++nil,
++++++++++++"!*'();:@&=%2B$,/?%25#[]",
++++++++++++CFStringBuiltInEncodings.UTF8.rawValue
++++++++)
++++}

}//+end+extension+String|code-block|syntax|javascript|517980|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Swift iOS:

Just For Information : I have used this:

<pre><code>extension String {

 func urlEncode() -&gt; CFString {
 return CFURLCreateStringByAddingPercentEscapes(
 nil,
 self,
 nil,
 "!*'();:@&amp;=+$,/?%#[]",
 CFStringBuiltInEncodings.UTF8.rawValue
 )
 }

}// end extension String
</code></pre>

blocks|key|518020|text|谷歌在他们的Google+Toolbox+for+Mac中实现了这一点。因此，这是一个很好的地方来展示他们是如何做到这一点的。另一种选择是包含工具箱并使用它们的实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|518021|查看实现here。(归根结底就是人们在这里发布的内容)。|518022|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/google/google-toolbox-for-mac|1|https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%252BURLArguments.m#L23^0|6|M|0|0|4|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Google implements this in their <a href="https://github.com/google/google-toolbox-for-mac" rel="nofollow">Google Toolbox for Mac</a>. 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 <a href="https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%2BURLArguments.m#L23" rel="nofollow">here</a>. (Which comes down to exactly what people have been posting here).

blocks|key|734420|text|这就是我在swift中的做法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734421|extension+String+{
++++func+encodeURIComponent()+->+String+{
++++++++return+self.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
++++}

++++func+decodeURIComponent()+->+String+{
++++++++return+self.componentsSeparatedByString("%2B").joinWithSeparator("+").stringByRemovingPercentEncoding!
++++}
}|code-block|syntax|javascript|734422|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is how I am doing this in swift.

<pre><code>extension String {
 func encodeURIComponent() -&gt; String {
 return self.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
 }

 func decodeURIComponent() -&gt; String {
 return self.componentsSeparatedByString("+").joinWithSeparator(" ").stringByRemovingPercentEncoding!
 }
}
</code></pre>

blocks|key|734474|text|下面是我使用的代码。注意:你必须使用@autoreleasepool特性，否则程序可能会崩溃或锁定集成开发环境。我不得不重新启动我的IDE三次，直到我意识到修复。看起来这段代码是ARC兼容的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|734475|这个问题已经被问了很多次，也给出了很多答案，但遗憾的是，所有选择的答案(以及其他一些建议)都是错误的。|734476|下面是我使用的测试字符串：This+is+my+123%2B+test+&+test2.+Got+it?!|734477|以下是我的目标C%2B%2B类方法：|734478|static+NSString+*+urlDecode(NSString+*stringToDecode)+{
++++NSString+*result+=+[stringToDecode+stringByReplacingOccurrencesOfString:@"%2B"+withString:@"+"];
++++result+=+[result+stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
++++return+result;
}

static+NSString+*+urlEncode(NSString+*stringToEncode)+{
++++@autoreleasepool+{
++++++++NSString+*result+=+(NSString+*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
++++++++++++++++NULL,
++++++++++++++++(CFStringRef)stringToEncode,
++++++++++++++++NULL,
++++++++++++++++(CFStringRef)@"!*'\"();:@&=%2B$,/?%25#[]%25+",
++++++++++++++++kCFStringEncodingUTF8
++++++++++++));
++++++++result+=+[result+stringByReplacingOccurrencesOfString:@"%2520"+withString:@"%2B"];
++++++++return+result;
++++}
}|code-block|syntax|javascript|734479|entityMap^0|I|G|0|0|D|12|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|Z|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|10|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

Here's what I use. Note you have to use the <code>@autoreleasepool</code> 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: <code>This is my 123+ test &amp; test2. Got it?!</code>

These are my Objective C++ class methods:

<pre><code>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;
 }
}
</code></pre>

blocks|key|734547|text|这可以在Objective+C+ARC.Use+CFBridgingRelease中工作，将核心基础样式的对象转换为Objective-C对象，并在此处将对象的所有权转移给.See+Function+CFBridgingRelease。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|734548|%2B+(NSString+*)encodeUrlString:(NSString+*)string+{
return+CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes
+++++++++++++++++++++++++(kCFAllocatorDefault,
++++++++++++++++++++++++++(__bridge+CFStringRef)string,
++++++++++++++++++++++++++NULL,
++++++++++++++++++++++++++CFSTR("!*'();:@&=%2B$,/?%25#[]"),
++++++++++++++++++++++++++kCFStringEncodingUTF8)
+++++++++++++++++++++++++);}|code-block|syntax|javascript|734549|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/foundation/1587932-cfbridgingrelease^0|2J|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

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 <a href="https://developer.apple.com/reference/foundation/1587932-cfbridgingrelease" rel="nofollow noreferrer">Function CFBridgingRelease</a> here.

<pre><code>+ (NSString *)encodeUrlString:(NSString *)string {
return CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes
 (kCFAllocatorDefault,
 (__bridge CFStringRef)string,
 NULL,
 CFSTR("!*'();:@&amp;=+$,/?%#[]"),
 kCFStringEncodingUTF8)
 );}
</code></pre>

blocks|key|734613|text|这是我在Swift+5上做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734614|func+formatPassword()+->+String+{
++++
++++var+output+=+"";

++++for+ch+in+self+{

++++++++let+char+=+String(ch)

++++++++switch+ch+{

++++++++++++case+"+":
++++++++++++++++output.append("%2B")

++++++++++++++++break

++++++++++++case+".",+"-",+"_",+"~",+"a"..."z",+"A"..."Z",+"0"..."9":

++++++++++++++++output.append(char)

++++++++++++++++break

++++++++++++++++default:

++++++++++++++++print(ch)

++++++++++++++++let+unicode+=+char.unicodeScalars.first?.value+??+0

++++++++++++++++let+unicodeValue+=+NSNumber(value:+unicode).intValue

++++++++++++++++let+hexValue+=+String(format:+"%2502X",+arguments:+[unicodeValue])

++++++++++++++++output+=+output.appendingFormat("%25%25%25@",+hexValue)

++++++++++++++++}

++++++++++++}
++++
++++return+output+as+String
}|code-block|syntax|javascript|734615|然后我调用了这个函数，在那里我定义了我的密码。|734616|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is what I did on Swift 5:
<pre><code>func formatPassword() -&gt; String {
 
 var output = &quot;&quot;;

 for ch in self {

 let char = String(ch)

 switch ch {

 case &quot; &quot;:
 output.append(&quot;+&quot;)

 break

 case &quot;.&quot;, &quot;-&quot;, &quot;_&quot;, &quot;~&quot;, &quot;a&quot;...&quot;z&quot;, &quot;A&quot;...&quot;Z&quot;, &quot;0&quot;...&quot;9&quot;:

 output.append(char)

 break

 default:

 print(ch)

 let unicode = char.unicodeScalars.first?.value ?? 0

 let unicodeValue = NSNumber(value: unicode).intValue

 let hexValue = String(format: &quot;%02X&quot;, arguments: [unicodeValue])

 output = output.appendingFormat(&quot;%%%@&quot;, hexValue)

 }

 }
 
 return output as String
}
</code></pre>
Then I called this function where I defined my password.

I have a <code>NSString</code> like this:

<pre><code>http://www.
</code></pre>

but I want to transform it to:

<pre><code>http%3A%2F%2Fwww.
</code></pre>

How can I do this?

Objective-C and Swift URL encoding

集成开发环境

Objective-C

Swift

我有一个这样的NSString：http://www.但我想将其转换为：http%3A%2F%2Fwww.我该怎么做呢？

问Objective-C和Swift URL编码
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