blocks|key|309991|text|对我起作用的是执行UTF8转换，然后用%252B替换%2B符号：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|309992|NSString+*urlString+=
++++[NSString+stringWithFormat:@"%25@/iphone/push/create?pn[token]=%25@&pn[send_at]=%25@",
+++++kHTTPURL,+appDelegate.deviceAPNToken,+[dateTimeToUse+description]];

urlString+=
++++[[urlString+stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
+++++stringByReplacingOccurrencesOfString:@"%2B"+withString:@"%252B"];|code-block|syntax|javascript|309993|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|$]]

What worked for me was doing the UTF8 conversion, then replacing the + sign with %2B:

<pre><code>NSString *urlString =
 [NSString stringWithFormat:@"%@/iphone/push/create?pn[token]=%@&amp;pn[send_at]=%@",
 kHTTPURL, appDelegate.deviceAPNToken, [dateTimeToUse description]];

urlString =
 [[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
 stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"];
</code></pre>

blocks|key|130666|text|字符串应该是URL编码的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130667|下面是NSString的一个类别，它将有助于：|130668|NSString%2BAdditions.h|offset|length|style|BOLD|130669|@interface+NSString+(Additions)

-+(NSString+*)stringByURLEncoding;|code-block|syntax|javascript|130670|NSString%2BAdditions.m|130671|#import+"NSString%2BAdditions.h"

@implementation+NSString+(Additions)

-+(NSString+*)stringByURLEncoding+{
++++return+(__bridge+NSString+*)CFURLCreateStringByAddingPercentEscapes(NULL,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++(CFStringRef)self,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++NULL,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++(CFStringRef)@"!*'\"();:@&=%2B$,/?%25#[]%25+",
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
}|130672|entityMap^0|0|0|0|K|0|0|0|K|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

The string should be URL encoded.

Here is a category for NSString that will help:

NSString+Additions.h

<pre><code>@interface NSString (Additions)

- (NSString *)stringByURLEncoding;
</code></pre>

NSString+Additions.m

<pre><code>#import "NSString+Additions.h"

@implementation NSString (Additions)

- (NSString *)stringByURLEncoding {
 return (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,
 (CFStringRef)self,
 NULL,
 (CFStringRef)@"!*'\"();:@&amp;=+$,/?%#[]% ",
 CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
}
</code></pre>

blocks|key|309916|text|对要作为参数包含的文本使用NSString的stringByAddingPercentEscapesUsingEncoding:方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|309917|顾名思义，该方法将返回一个自动释放的字符串，其中包含接收方的url安全版本。|309918|entityMap^0|D|8|M|16|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Use <code>NSString</code>'s <code>stringByAddingPercentEscapesUsingEncoding:</code> method on the text you want to include as an argument.

As its name implies, the method will convert return an auto-released string containing an url-safe version of the receiver.

blocks|key|309941|text|我想，我可以提供我的解决办法，作为一个答案，因为我不认为有一个好的解决方案，原来的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|309942|加号(%2B)在URL中完全有效，因此我的解决方案是将时间转换为GMT，并从字符串中删除时区/DST偏移量。我将把它留给读者来确定下面secondsFromGMT的值，因为在我的例子中，它总是一样的，因为我只对web服务器生成的时间戳感兴趣。|309943|NSString+*gmtWhen+=+[[self+descriptionWithCalendarFormat:nil
+++++++++++++++++++++++++++timeZone:[NSTimeZone
+++++++++++++++++++++++++++timeZoneForSecondsFromGMT:secondsFromGMT
+++++++++++++++++++++]+locale:nil]+stringByReplacingOccurrencesOfString:@"+%2B0000"+withString:@""];|code-block|syntax|javascript|309944|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|$]]

Thought I may as well provide my workaround as an answer, as I don't think there's a good solution to the original problem.

The plus sign (+) is completely valid in a URL, so my solution was to convert the time to GMT and remove the timezone/DST offset from the string. I'll leave it as an exercise for the reader to determine the value of secondsFromGMT below as, in my case, it's always the same because I'm only interested in timestamps generated by a web server. 

<pre><code>NSString *gmtWhen = [[self descriptionWithCalendarFormat:nil
 timeZone:[NSTimeZone
 timeZoneForSecondsFromGMT:secondsFromGMT
 ] locale:nil] stringByReplacingOccurrencesOfString:@" +0000" withString:@""];
</code></pre>

blocks|key|310140|text|使用URLComponents+(Swift+3)时的解决方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|310141|var+params+=+["email":+"user%2Bios-default@example.com",+"name":+"John+Brown"]
var+components+=+URLComponents(string:+"http://www.example.com")!
components.path+=+"/login"
components.queryItems+=+params.map+{+URLQueryItem(name:+$0,+value:+$1)+}

let+url_NoFix+=+components.url!
//+http://www.example.com/login?name=John%2520Brown&email=user%2Bios-default@example.com

let+cs+=+CharacterSet(charactersIn:+"%2B").inverted
let+q+=++components.percentEncodedQuery?.addingPercentEncoding(withAllowedCharacters:+cs)
components.percentEncodedQuery+=+q

let+url_Fixed+=+components.url!
//+http://www.example.com/login?name=John%2520Brown&email=user%252Bios-default@example.com|code-block|syntax|javascript|310142|entityMap^0|2|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Solution when using URLComponents (Swift 3):

<pre><code>var params = ["email": "user+ios-default@example.com", "name": "John Brown"]
var components = URLComponents(string: "http://www.example.com")!
components.path = "/login"
components.queryItems = params.map { URLQueryItem(name: $0, value: $1) }

let url_NoFix = components.url!
// http://www.example.com/login?name=John%20Brown&amp;email=user+ios-default@example.com

let cs = CharacterSet(charactersIn: "+").inverted
let q = components.percentEncodedQuery?.addingPercentEncoding(withAllowedCharacters: cs)
components.percentEncodedQuery = q

let url_Fixed = components.url!
// http://www.example.com/login?name=John%20Brown&amp;email=user%2Bios-default@example.com
</code></pre>

blocks|key|340369|text|使用下面的代码对字符串进行编码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340370|*)CFURLCreateStringByAddingPercentEscapes(NULL，*+NSString+=+(NSString+NSString+(CFStringRef)self，NULL，(CFStringRef)@"%2B"，kCFStringEncodingUTF8)；|340371|这将对您的字符串进行编码，这将防止在post方法中将数据替换为%252b。|340372|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

encode you string by using below code 

NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, 
(CFStringRef)self,NULL,(CFStringRef)@"+",kCFStringEncodingUTF8);

this will encode + of you string which will prevent replacement of + by %2b while posting data in post method

blocks|key|128636|text|要获得编码%2B+(%252B)+(它适用于所有字符)，请使用CFURLCreateStringByAddingPercentEscapes作为|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|128637|/**
+get+parameterized+url+from+url+and+query+parameters.
+*/
%2B(NSString+*)getParameterizedUrl:(NSString+*)url+withParameters:(NSDictionary+*)queryDictionary
{
++++NSMutableArray+*mutablePairs+=+[NSMutableArray+array];
++++for+(NSString+*key+in+queryDictionary)+{
++++++++[mutablePairs+addObject:[NSString+stringWithFormat:@"%25@=%25@",+CTPercentEscapedQueryStringKeyFromStringWithEncoding(key,+NSUTF8StringEncoding),+CTPercentEscapedQueryStringValueFromStringWithEncoding(queryDictionary[key],+NSUTF8StringEncoding)]];
++++}

++++return+[[NSString+alloc]initWithFormat:@"%25@?%25@",url,[mutablePairs+componentsJoinedByString:@"&"]];
}

static+NSString+*+const+kCharactersToBeEscapedInQueryString+=+@":/?&=;%2B!@#$()',*";

static+NSString+*+CTPercentEscapedQueryStringKeyFromStringWithEncoding(NSString+*string,+NSStringEncoding+encoding)+{
++++static+NSString+*+const+kCharactersToLeaveUnescapedInQueryStringPairKey+=+@"[].";

++++return+(__bridge_transfer++NSString+*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,+(__bridge+CFStringRef)string,+(__bridge+CFStringRef)kCharactersToLeaveUnescapedInQueryStringPairKey,+(__bridge+CFStringRef)kCharactersToBeEscapedInQueryString,+CFStringConvertNSStringEncodingToEncoding(encoding));
}

static+NSString+*+CTPercentEscapedQueryStringValueFromStringWithEncoding(NSString+*string,+NSStringEncoding+encoding)+{
++++return+(__bridge_transfer++NSString+*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,+(__bridge+CFStringRef)string,+NULL,+(__bridge+CFStringRef)kCharactersToBeEscapedInQueryString,+CFStringConvertNSStringEncodingToEncoding(encoding));
}|code-block|syntax|javascript|128638|并在您的代码中用作|128639|NSMutableDictionary+*params+=+[[NSMutableDictionary+alloc]init];
[params+setObject:@"2009-05-04T11:22:00%2B01:00"+forKey:@"timestamp"];

NSString+*urlString+=+[self+getParameterizedUrl:@"http://www.example.com"+withParameters:params];
NSURL+*url+=+[NSURL+URLWithString:[urlString+stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];|128640|entityMap^0|R|13|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

To get encoded plus (%2B) (It works with all charcters) use <code>CFURLCreateStringByAddingPercentEscapes</code> as

<pre><code>/**
 get parameterized url from url and query parameters.
 */
+(NSString *)getParameterizedUrl:(NSString *)url withParameters:(NSDictionary *)queryDictionary
{
 NSMutableArray *mutablePairs = [NSMutableArray array];
 for (NSString *key in queryDictionary) {
 [mutablePairs addObject:[NSString stringWithFormat:@"%@=%@", CTPercentEscapedQueryStringKeyFromStringWithEncoding(key, NSUTF8StringEncoding), CTPercentEscapedQueryStringValueFromStringWithEncoding(queryDictionary[key], NSUTF8StringEncoding)]];
 }

 return [[NSString alloc]initWithFormat:@"%@?%@",url,[mutablePairs componentsJoinedByString:@"&amp;"]];
}

static NSString * const kCharactersToBeEscapedInQueryString = @":/?&amp;=;+!@#$()',*";

static NSString * CTPercentEscapedQueryStringKeyFromStringWithEncoding(NSString *string, NSStringEncoding encoding) {
 static NSString * const kCharactersToLeaveUnescapedInQueryStringPairKey = @"[].";

 return (__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)string, (__bridge CFStringRef)kCharactersToLeaveUnescapedInQueryStringPairKey, (__bridge CFStringRef)kCharactersToBeEscapedInQueryString, CFStringConvertNSStringEncodingToEncoding(encoding));
}

static NSString * CTPercentEscapedQueryStringValueFromStringWithEncoding(NSString *string, NSStringEncoding encoding) {
 return (__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)string, NULL, (__bridge CFStringRef)kCharactersToBeEscapedInQueryString, CFStringConvertNSStringEncodingToEncoding(encoding));
}
</code></pre>

And use in your code as

<pre><code>NSMutableDictionary *params = [[NSMutableDictionary alloc]init];
[params setObject:@"2009-05-04T11:22:00+01:00" forKey:@"timestamp"];

NSString *urlString = [self getParameterizedUrl:@"http://www.example.com" withParameters:params];
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
</code></pre>

I need to pass a timestamp with a timezone offset in a GET request, e.g.,

<blockquote>
 2009-05-04T11:22:00+01:00
</blockquote>

This looks like a two arguments "2009-05-04T11:22:00" and "01:00" to the receiving PHP script (over which I've no control).

NSURL doesn't encode plus signs, but if I make an NSURL using the string

<blockquote>
 2009-05-04T11:22:00%2B01:00
</blockquote>

the url I end up with contains: 

<blockquote>
 2009-05-04T11:22:00%252B01:00
</blockquote>

Any ideas how I can preserve my encoded plus sign or just plain prevent NSURL from encoding anything?

Make an NSURL with an encoded plus (%2B)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要在GET请求中传递带有时区偏移的时间戳，例如， 2009-05-04T11:22:00+01:00这看起来像是接收PHP脚本的两个参数"2009-05-04T11:22:00“和"01:00”(我无法控制)。NSURL不编码加符号，但如果我使用字符串创建NSURL 2009-05-04T11:22:00%2B01:00我最终得到的url包含： 2009-05-04T11:22:00%252B

问使用编码+ (%2B)创建NSURL
EN

回答 7

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问使用编码+ (%2B)创建NSURLEN

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问使用编码+ (%2B)创建NSURL
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