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    <blockquote> <pre><code>NSString* urlStr = @"https://developer.apple.com/library/ios/#/legacy/library/documentation/Xcode/Conceptual/ios_development_workflow/10-Configuring_Development_and_Distribution_Assets/identities_and_devices.html#//apple_ref/doc/uid/TP40007959-CH4-SW"; urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSURL* url = [NSURL URLWithString:urlStr]; </code></pre> <p>After using encoding ,the "#" is replaced by "%23".</p> </blockquote> <p>Well, yeah. That's what you told it to do.</p> <p>If you don't want that, then don't do that.</p> <blockquote> <p>If you don't use encoding, the NSURL will be nil.</p> </blockquote> <p>That's because there are two #s, so your URL is invalid. It makes sense for even NSURL (which is VERY permissive about dodgy URLs) to reject it.</p> <p>Take out the first, and only the first, #:</p> <pre><code>urlStr = [urlStr stringByReplacingOccurrencesOfString:@"/#" withString:@""]; </code></pre> <p>(That approach is a bit fragile; you could make it more robust by <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/rangeOfString%3a" rel="nofollow">finding the range of the first match</a> and then <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/stringByReplacingOccurrencesOfString%3awithString%3aoptions%3arange%3a" rel="nofollow">only replacing within that range</a>.)</p> <p>Now your URL is valid, so NSURL will have no problem with it.</p>
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    1. POHow to load NSURL that contains “#” with WebView?
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    1. USPeter Hosey
    1. USPeter Hosey
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    1. COso,how should I code the regular expression and make it common?
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      1. USgohamgx
    2. CO@gohamgx: I'm not sure what you mean by “common”, but the expression should be something like `/+#/+`, which you replace with `/`, and you should find the first match, then replace all matches within the range of the first match (which will replace that match only).
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    3. COcommon means make the regular expression match most of situations
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