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Remove HTML Tags from an NSString on the iPhone

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心在旅途
心在旅途 2020-11-22 10:02

There are a couple of different ways to remove HTML tags from an NSString in Cocoa.

One way is to render the string into an

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  • 我在风中等你
    2020-11-22 10:15 
    #import "RegexKitLite.h"

string text = [html stringByReplacingOccurrencesOfRegex:@"<[^>]+>" withString:@""]
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  • 慢半拍i
    2020-11-22 10:15

    I've extended the answer by m.kocikowski and tried to make it a bit more efficient by using an NSMutableString. I've also structured it for use in a static Utils class (I know a Category is probably the best design though), and removed the autorelease so it compiles in an ARC project.

    Included here in case anybody finds it useful.

    .h

    + (NSString *)stringByStrippingHTML:(NSString *)inputString;

    .m

    + (NSString *)stringByStrippingHTML:(NSString *)inputString 
{
  NSMutableString *outString;

  if (inputString)
  {
    outString = [[NSMutableString alloc] initWithString:inputString];

    if ([inputString length] > 0)
    {
      NSRange r;

      while ((r = [outString rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
      {
        [outString deleteCharactersInRange:r];
      }      
    }
  }

  return outString; 
}
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  • 忘掉有多难
    2020-11-22 10:18

    Another one way:

    Interface:

    -(NSString *) stringByStrippingHTML:(NSString*)inputString;

    Implementation

    (NSString *) stringByStrippingHTML:(NSString*)inputString
{ 
NSAttributedString *attrString = [[NSAttributedString alloc] initWithData:[inputString dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)} documentAttributes:nil error:nil];
NSString *str= [attrString string]; 

//you can add here replacements as your needs:
    [str stringByReplacingOccurrencesOfString:@"[" withString:@""];
    [str stringByReplacingOccurrencesOfString:@"]" withString:@""];
    [str stringByReplacingOccurrencesOfString:@"\n" withString:@""];

    return str;
}

    Realization

    cell.exampleClass.text = [self stringByStrippingHTML:[exampleJSONParsingArray valueForKey: @"key"]];

    or simple

    NSString *myClearStr = [self stringByStrippingHTML:rudeStr];

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  • 天涯浪人
    2020-11-22 10:19

    use this 

    NSString *myregex = @"<[^>]*>"; //regex to remove any html tag

NSString *htmlString = @"<html>bla bla</html>";
NSString *stringWithoutHTML = [hstmString stringByReplacingOccurrencesOfRegex:myregex withString:@""];

    don't forget to include this in your code : #import "RegexKitLite.h" here is the link to download this API : http://regexkit.sourceforge.net/#Downloads

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  • 暗喜
    2020-11-22 10:19

    Extending this more from m.kocikowski's and Dan J's answers with more explanation for newbies

    1# First you have to create objective-c-categories to make the code useable in any class.

    .h

    @interface NSString (NAME_OF_CATEGORY)

- (NSString *)stringByStrippingHTML;

@end

    .m

    @implementation NSString (NAME_OF_CATEGORY)

- (NSString *)stringByStrippingHTML
{
NSMutableString *outString;
NSString *inputString = self;

if (inputString)
{
    outString = [[NSMutableString alloc] initWithString:inputString];

    if ([inputString length] > 0)
    {
        NSRange r;

        while ((r = [outString rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
        {
            [outString deleteCharactersInRange:r];
        }
    }
}

return outString;
}

@end

    2# Then just import the .h file of the category class you've just created e.g.

    #import "NSString+NAME_OF_CATEGORY.h"

    3# Calling the Method.

    NSString* sub = [result stringByStrippingHTML];
NSLog(@"%@", sub);

    result is NSString I want to strip the tags from.

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  • 天命终不由人
    2020-11-22 10:20

    Take a look at NSXMLParser. It's a SAX-style parser. You should be able to use it to detect tags or other unwanted elements in the XML document and ignore them, capturing only pure text.

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