iOS:URL字符串中的&符问题

Question

我们如何在URL中传递字符串Mr.X和Mr.Y.

我试过这个,但这个人做了所有的字符,但是&符号.

[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]

Answer 1

甚至更短:

@implementation NSString (Escaping)
- (NSString*)stringWithPercentEscape {            
    return [(NSString *) CFURLCreateStringByAddingPercentEscapes(
        NULL, 
        (CFStringRef)[[self mutableCopy] autorelease], 
        NULL, 
        CFSTR("?=,!$&'()*+;@?\n\"<>#\t :/"),
        kCFStringEncodingUTF8) autorelease];
}
@end

在这里它再次作为ARC符合内联函数帮助器:

#if __has_feature(objc_arc)
static inline NSString *hxURLEscape(NSString *v) {
    static CFStringRef _hxURLEscapeChars = CFSTR("?=,!$&'()*+;@?\r\n\"<>#\t :/");
    return ((__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes(
        NULL, 
        (__bridge CFStringRef)[v mutableCopy], 
        NULL, 
        _hxURLEscapeChars, 
        kCFStringEncodingUTF8));
}
#endif

Answer 2

-stringByAddingPercentEscapesUsingEncoding:不执行完整的转义编码.您应该使用手动添加编码-replaceOccurrencesOfString:withString:

这是一个完整的列表(镜像Gamecat的列表),最初建议在https://devforums.apple.com/message/15674#15674.正如尼克指出的那样,这很昂贵,所以不要只考虑完整列表而不考虑你逃避的真正要求.

NSMutableString *escaped = [actionString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];   
[escaped replaceOccurrencesOfString:@"$" withString:@"%24" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"&" withString:@"%26" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"+" withString:@"%2B" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"," withString:@"%2C" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"/" withString:@"%2F" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@":" withString:@"%3A" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@";" withString:@"%3B" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"=" withString:@"%3D" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"?" withString:@"%3F" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"@" withString:@"%40" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@" " withString:@"%20" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"\t" withString:@"%09" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"#" withString:@"%23" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"<" withString:@"%3C" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@">" withString:@"%3E" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"\"" withString:@"%22" options:NSCaseInsensitiveSearch range:wholeString];
[escaped replaceOccurrencesOfString:@"\n" withString:@"%0A" options:NSCaseInsensitiveSearch range:wholeString];

此代码肯定会对您的URL进行哈希处理.

Answer 3

使用 %26 作为 url 转义。

其他逃生方式：

$  %24
&  %26
+  %2B
,  %2C
/  %2F
:  %3A
;  %3B
=  %3D
?  %3F
@  %40

Answer 4

在 URL 中，& 符号是受保护的关键字，表示包含查询字符串变量。您不能将其作为值本身的一部分放入。您需要将其更改为其他内容。

以下是 StackOverflow 上提出的同一问题的链接：ASP.Net URLEncode &s for use in Query String