如何对 iPhone SDK 中的 @ 符号进行 URL 编码？答案

【问题标题】：How do you URL-encode the @ symbol in the iPhone SDK?如何对 iPhone SDK 中的 @ 符号进行 URL 编码？
【发布时间】：2010-10-31 19:06:33
【问题描述】：

使用 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding 对 NSString 进行 URL 编码不会对 @ 符号进行编码。解决这个问题的正确方法是什么？谢谢。

【问题讨论】：

标签： iphone urlencode

【解决方案1】：

在你已经拥有的代码行之后添加这个（并将接收器等更改为你自己的变量）：

[escaped replaceOccurrencesOfString:@"@" withString:@"%40" options:NSCaseInsensitiveSearch range:wholeString];

如果您想确保所有内容都已编码，这是最好的方法：

NSMutableString *escaped = [actionString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];       
[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];

（来自罗杰@Iphone SDk : Issue with ampersand in the URL string）

【讨论】：

【解决方案2】：

URL 编码的最佳方法是使用此方法，来自我的博文http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/：

NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(
  NULL,
  (CFStringRef)unencodedString,
  NULL,
  (CFStringRef)@"!*'();:@&=+$,/?%#[]",
  kCFStringEncodingUTF8 );

【讨论】：

上面的代码效果很好，但是缺少一些需要编码的字符。将此添加到代码中.. (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% "