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Extends String to created NSAttributedStrings, and vice versa, for many encoding types, including HTML and RTF.
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| // | |
| // NSAttributedString+HTML.swift | |
| // | |
| // Created by Amitai Blickstein on 6/22/16. | |
| // Copyright © 2016 Amitai Blickstein, LLC. All rights reserved. | |
| // | |
| import UIKit | |
| //////////////////////// | |
| // ⇒ NSAttributedString | |
| //////////////////////// | |
| extension NSAttributedString { | |
| /// Attempts to create an `NSAttributedString` from an encoded string of the specified type. | |
| static func fromEncodedString(_ eString: String, ext: DocEXT) -> NSAttributedString? { | |
| guard let data = eString.data(using: .utf8) else { return nil } | |
| let docType = documentTypeDictionary(extension: ext) | |
| let result = try? NSAttributedString(data: data, | |
| options: docType, | |
| documentAttributes: nil) | |
| return result | |
| } | |
| /// Attempts to create an NSAttributedString from an encoded **html** string. | |
| static func fromHTML(_ html: String) -> NSAttributedString? { | |
| return NSAttributedString.fromEncodedString(html, ext: .html) | |
| } | |
| //////////////////////// | |
| // NSAttributedString ⇒ <html>String</html> | |
| //////////////////////// | |
| ///Attemps to convert the receiver into an *encoded* string, according to chosen doc type. | |
| // For a scrubbed string, use the NSAttributedString method `string`. | |
| func encodedString(ext: DocEXT) -> String? { | |
| let docType = documentTypeDictionary(extension: ext) | |
| guard let data = try? self.data(from: NSRangeFromString(self.string), documentAttributes: docType) | |
| else { return nil } | |
| return String.init(data: data, encoding: .utf8) | |
| } | |
| } | |
| //////////////////////// | |
| // <html>String</html> ⇒ NSAttributedString | |
| //////////////////////// | |
| extension String { | |
| func attributedString(ext: DocEXT) -> NSAttributedString? { | |
| guard let data = self.data(using: .utf8) else { return nil } | |
| let result = try? NSAttributedString(data: data, | |
| options: documentTypeDictionary(extension: ext), | |
| documentAttributes: nil) | |
| return result | |
| } | |
| } | |
| // Helper(s) | |
| fileprivate func documentTypeDictionary(extension ext: DocEXT) -> [String: Any] { | |
| let documentTypeDictionary: [DocEXT: Any] = [ | |
| .rtfd: NSRTFDTextDocumentType, | |
| .rtf : NSRTFTextDocumentType, | |
| .htm : NSHTMLTextDocumentType, | |
| .html: NSHTMLTextDocumentType, | |
| .txt : NSPlainTextDocumentType | |
| ] | |
| let docType = documentTypeDictionary[ext] | |
| return [NSDocumentTypeDocumentAttribute: docType ?? NSPlainTextDocumentType] | |
| } | |
| enum DocEXT: String { | |
| case rtfd | |
| case rtf | |
| case htm | |
| case html | |
| case txt | |
| } |
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this is extension dont work swift 4.2 or 5