iOS之加载HTML中的特殊字符

在最近的工程中解析字符串的时候出现了这样的

这些不是标准的HTML字符串 所以我们要先转成带<>的HTML字符串 然后在进行加载

贴上代码

-(NSString *)filterHTML:(NSString *)html
{
    NSScanner * scanner = [NSScanner scannerWithString:html];
    NSString * text = nil;
    while([scanner isAtEnd]==NO)
    {
        //找到标签的起始位置
        [scanner scanUpToString:@"&" intoString:nil];
        //找到标签的结束位置
        [scanner scanUpToString:@";" intoString:&text];
        //替换字符
        html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>",text] withString:@""];
    }
    //    NSString * regEx = @"<([^>]*)>";
    //    html = [html stringByReplacingOccurrencesOfString:regEx withString:@""];
    return html;
}
//将HTML字符串转化为NSAttributedString富文本字符串
- (NSAttributedString *)attributedStringWithHTMLString:(NSString *)htmlString
{
    NSDictionary *options = @{ NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType,
                               NSCharacterEncodingDocumentAttribute :@(NSUTF8StringEncoding) };
    
    NSData *data = [htmlString dataUsingEncoding:NSUTF8StringEncoding];
    
    return [[NSAttributedString alloc] initWithData:data options:options documentAttributes:nil error:nil];
}
//将 &lt 等类似的字符转化为HTML中的“<”等
- (NSString *)htmlEntityDecode:(NSString *)string
{
    string = [string stringByReplacingOccurrencesOfString:@"&quot;" withString:@"\""];
    string = [string stringByReplacingOccurrencesOfString:@"&apos;" withString:@"'"];
    string = [string stringByReplacingOccurrencesOfString:@"&lt;" withString:@"<"];
    string = [string stringByReplacingOccurrencesOfString:@"&gt;" withString:@">"];
    string = [string stringByReplacingOccurrencesOfString:@"&amp;" withString:@"&"]; // Do this last so that, e.g. @"&amp;lt;" goes to @"&lt;" not @"<"
    
    return string;
}


  

NSString *str = [[responseObject valueForKey:@"info"] valueForKey:@"content"];
NSLog(@"%@", str);
str = [self htmlEntityDecode:str];
NSAttributedString *attributedStr = [self attributedStringWithHTMLString:str];
contentLable.attributedText = attributedStr;
[self.webView loadHTMLString:str baseURL:nil];