iOS中URL字符串的URLencode与URLdecode

最新推荐文章于 2021-06-22 01:14:03 发布

原创最新推荐文章于 2021-06-22 01:14:03 发布 · 725 阅读

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本文介绍如何在iOS中实现URL参数的编码与解码，包括自定义编码规则及使用系统提供的CharacterSet进行编码。

url字符串中具有特殊功能的特殊字符的字符串，或者中文字符,作为参数用GET方式传递时，需要用urlencode处理一下

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//URLEncode
+(NSString*)encodeString:(NSString*)unencodedString{
    
    // CharactersToBeEscaped = @":/?&=;+!@#$()~',*";
    // CharactersToLeaveUnescaped = @"[].";
    
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              (CFStringRef)unencodedString,
                                                              NULL,
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              kCFStringEncodingUTF8));
    
    return encodedString;
}
 
//URLDEcode
-(NSString *)decodeString:(NSString*)encodedString
 
{
    //NSString *decodedString = [encodedString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding ];
 
    NSString *decodedString  = (__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,
                                                                                                                     (__bridge CFStringRef)encodedString,
                                                                                                                     CFSTR(""),
                                                                                                                     CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
    return decodedString;
}

iOS之后新的API NS_AVAILABLE(10_9, 7_0)

NSCharacterSet系统内置的一些返回CharacterSet 的方法

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URLFragmentAllowedCharacterSet  "#%<>[\]^`{|}

URLHostAllowedCharacterSet      "#%/<>?@\^`{|}

URLPasswordAllowedCharacterSet  "#%/:<>?@[\]^`{|}

URLPathAllowedCharacterSet      "#%;<>?[\]^`{|}

URLQueryAllowedCharacterSet    
"#%<>[\]^`{|}

URLUserAllowedCharacterSet      "#%/:<>?@[\]^`

使用

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//encode
[string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
//decode
[string stringByRemovingPercentEncoding];

当然系统内置的CharacterSet要是满足不了你的话，你可以自定义NSCharacterSet

Objective-C


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NSCharacterSet
*c
=
[NSCharacterSet
 characterSetWithCharactersInString:@"'();:@&=+$,/?%#[]"];

[string
 stringByAddingPercentEncodingWithAllowedCharacters:c];