从 NSString 中删除 HTML 标签等 [重复]

Question

可能重复：
Remove HTML Tags from an NSString on the iPhone

我想知道从 NSString 中去除所有 HTML/Javascript 等标签的最佳方法。

我当前使用的解决方案会留下 cmets 和其他标签，删除它们的最佳方法是什么？

我知道 OF 解决方案，例如LibXML，但我想要一些可以使用的示例。

目前的解决方案：

- (NSString *)flattenHTML:(NSString *)html trimWhiteSpace:(BOOL)trim {

    NSScanner *theScanner;
    NSString *text = nil;

    theScanner = [NSScanner scannerWithString:html];

    while ([theScanner isAtEnd] == NO) {

        // find start of tag
        [theScanner scanUpToString:@"<" intoString:NULL] ;                 
        // find end of tag         
        [theScanner scanUpToString:@">" intoString:&text] ;

        // replace the found tag with a space
        //(you can filter multi-spaces out later if you wish)
        html = [html stringByReplacingOccurrencesOfString:
                [ NSString stringWithFormat:@"%@>", text]
                                               withString:@""];
    }

    // trim off whitespace
    return trim ? [html stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] : html;  
}

Answer 1

试试这个方法从字符串中删除 HTML 标记：

- (NSString *)stripTags:(NSString *)str
{
    NSMutableString *html = [NSMutableString stringWithCapacity:[str length]];

    NSScanner *scanner = [NSScanner scannerWithString:str];
    scanner.charactersToBeSkipped = NULL;
    NSString *tempText = nil;

    while (![scanner isAtEnd])
    {
        [scanner scanUpToString:@"<" intoString:&tempText];

        if (tempText != nil)
            [html appendString:tempText];

        [scanner scanUpToString:@">" intoString:NULL];

        if (![scanner isAtEnd])
            [scanner setScanLocation:[scanner scanLocation] + 1];

        tempText = nil;
    }

    return html;
}