How do i convert NSAttributedString into HTML string? - html

Question

As the title tells,now i can simple convert HTML into NSAttributedString with initWithHTML:documentAttributes: , but what i want to do here is reverse.
Is there any 3rd party library to achieve this?
#implementation NSAttributedString(HTML)
-(NSString *)htmlForAttributedString{
NSArray * exclude = [NSArray arrayWithObjects:#"doctype",
#"html",
#"head",
#"body",
#"xml",
nil
];
NSDictionary * htmlAtt = [NSDictionary
dictionaryWithObjectsAndKeys:NSHTMLTextDocumentType,
NSDocumentTypeDocumentAttribute,
exclude,
NSExcludedElementsDocumentAttribute,
nil
];
NSError * error;
NSData * htmlData = [self dataFromRange:NSMakeRange(0, [self length])
documentAttributes:htmlAtt error:&error
];
//NSAttributedString * htmlString = [[NSAttributedString alloc]initWithHTML:htmlData documentAttributes:&htmlAtt];
NSString * htmlString = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];
return htmlString;
}
#end

Answer 1

Use dataFromRange:documentAttributes: with the document type attribute (NSDocumentTypeDocumentAttribute) set to HTML (NSHTMLTextDocumentType):
NSAttributedString *s = ...;
NSDictionary *documentAttributes = #{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType};
NSData *htmlData = [s dataFromRange:NSMakeRange(0, s.length) documentAttributes:documentAttributes error:NULL];
NSString *htmlString = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];

Answer 2

This is a swift 4 conversion of #omz answer, hope is useful to anyone landing here
extension NSAttributedString {
var attributedString2Html: String? {
do {
let htmlData = try self.data(from: NSRange(location: 0, length: self.length), documentAttributes:[.documentType: NSAttributedString.DocumentType.html]);
return String.init(data: htmlData, encoding: String.Encoding.utf8)
} catch {
print("error:", error)
return nil
}
}
}