NSAttributedString initWithData and NSHTMLTextDocumentType crash if not on main thread

Question

calling

NSAttributedString * as = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocume         


        

Answer 1

Maybe its too late to answer this question, but may help others.

Actually NSAttributedString and NSHTMLTextDocumentType must run asynchronously either on main queue or a global queue.

You can use it in a background thread but you have to dispatch your code block containing NSAttributedString's initializer on a global or main queue. For example:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { () -> Void in




            print("Started on \(NSThread.currentThread())")

            let encodedData = "Hello".dataUsingEncoding(NSUTF8StringEncoding)!
            let attributedOptions : [String: AnyObject] = [
                NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding
            ]


            let attributedString = (try? NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil) ?? NSAttributedString(string: ""))



            print("Finished")

        }