objective c - iOS ReactiveCocoa RACObserve UITextView NSAttributedString -

i'm trying use reactivecocoa bindings bind uitextview's attributedtext model. however, attributedstring value not saved expected. wrong binding?

- (void)viewdidload {     [super viewdidload];      nserror *error;     nsattributedstring *attributedtext = [[nsattributedstring alloc] initwithdata:self.note.attributedtext                                                                       options:@{nsdocumenttypedocumentattribute: nsrtfdtextdocumenttype,                                                                                 nscharacterencodingdocumentattribute: [nsnumber numberwithint:nsutf8stringencoding]}                                                            documentattributes:nil error:&error];     self.texttextview.attributedtext = attributedtext;      rac(self.note, attributedtext) = [racobserve(self.texttextview, attributedtext) map:^id(nsattributedstring *attributedtext) {         return [attributedtext datafromrange:nsmakerange(0, attributedtext.length)                    documentattributes:@{nsdocumenttypedocumentattribute: nsrtfdtextdocumenttype,                                         nscharacterencodingdocumentattribute: [nsnumber numberwithint:nsutf8stringencoding]}                                 error:nil];     }]; 

i believe can use rac_textsignal category here. have tried following?

- (void)viewdidload {     [super viewdidload];      nserror *error;     nsattributedstring *attributedtext = [[nsattributedstring alloc] initwithdata:self.note.attributedtext                                                                       options:@{nsdocumenttypedocumentattribute: nsrtfdtextdocumenttype,                                                                                 nscharacterencodingdocumentattribute: [nsnumber numberwithint:nsutf8stringencoding]}                                                            documentattributes:nil error:&error];     self.texttextview.attributedtext = attributedtext;      @weakify(self);     rac(self.note, attributedtext) = [self.texttextview.rac_textsignal map:^id(__unused nsstring *text) {         @strongify(self);         return [self.texttextview.attributedtext datafromrange:nsmakerange(0, attributedtext.length)                    documentattributes:@{nsdocumenttypedocumentattribute: nsrtfdtextdocumenttype,                                         nscharacterencodingdocumentattribute: [nsnumber numberwithint:nsutf8stringencoding]}                                 error:nil];     }]; }