Can NSAttributedString which contains NSTextAttachment be stored(or restored)?

Question

I am writing a Text Editor, with which users can input text with styles and insert images, so I am using NSAttributedString to manage the contents. My question is how can I store the contents before Text Editor was closed, and restore the contents after editor opened next time?

I wrote a category of NSAttributedString, right now I can store(and restore) text but not UIImageView in NSTextAttachment, below is part of my code:

-(NSData*)customEncode {
__block NSMutableArray* archivableAttributes=[[NSMutableArray alloc]init];

[self enumerateAttributesInRange:NSMakeRange(0, [self length]) options:0 usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
    NSLog(@"range: %d %d",range.location, range.length);
    NSLog(@"dict: %@",attrs);
    NSLog(@"keys: %@", [attrs allKeys]);
    NSLog(@"values: %@", [attrs allValues]);

    NSMutableDictionary* tDict=[[NSMutableDictionary alloc]init];

    [tDict setObject:[NSNumber numberWithInt:range.location] forKey:@"location"];
    [tDict setObject:[NSNumber numberWithInt:range.length] forKey:@"length"];

    for (NSString* tKey in [attrs allKeys]) {
        if ([tKey isEqualToString:@"CTUnderlineColor"]) {
            [tDict setObject:[NSAttributedString arrayFromCGColorComponents:((CGColorRef)[attrs objectForKey:@"CTUnderlineColor"])] forKey:@"CTUnderlineColor"];
        }
        if ([tKey isEqualToString:@"NSUnderline"]) {
            NSNumber* underline=[attrs objectForKey:@"NSUnderline"];
            [tDict setObject:underline forKey:@"NSUnderline"];
        }
        if ([tKey isEqualToString:@"CTForegroundColor"]) {
            [tDict setObject:[NSAttributedString arrayFromCGColorComponents:((CGColorRef)[attrs objectForKey:@"CTForegroundColor"])] forKey:@"CTForegroundColor"];
        }
        if ([tKey isEqualToString:@"NSFont"]) {
            CTFontRef font=((__bridge CTFontRef)[attrs objectForKey:@"NSFont"]);

            NSDictionary* fontDict=[NSDictionary
                                    dictionaryWithObjects:
                                    [NSArray arrayWithObjects:(NSString*)CFBridgingRelease(CTFontCopyPostScriptName(font)),[NSNumber numberWithFloat:CTFontGetSize(font)], nil]
                                    forKeys:
                                    [NSArray arrayWithObjects:@"fontName", @"fontSize", nil]];

            [tDict setObject:fontDict forKey:@"NSFont"];
        }
    }

    [archivableAttributes addObject:tDict];
}];

NSMutableDictionary* archiveNSMString=[NSMutableDictionary
                                       dictionaryWithObjects: [NSArray arrayWithObjects:[self string],archivableAttributes,nil]
                                       forKeys:[NSArray arrayWithObjects:@"string",@"attributes",nil]];

NSLog(@"archivableAttributes array: %@",archiveNSMString);

NSData* tData=[NSKeyedArchiver archivedDataWithRootObject:archiveNSMString];

NSLog(@"tdata: %@",tData);

return tData;

}

I had spent quite some time investigating and experimenting, and searches showed several people who had the same question, but no satisfactory answers.

Answer 1

At last, I used a subclass of NSKeyedArchiver named YYTextArchiver to serialize the NSAttributedString directly, and it worked for me.