Hacked version of TiUIAttributedStringProxy.m to try to add support for ParagraphStyle and Attachment attributed strings.

TiUIAttributedStringProxy.m

/**
 * Appcelerator Titanium Mobile
 * Copyright (c) 2015 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Apache Public License
 * Please see the LICENSE included with this distribution for details.
 */
#if defined (USE_TI_UIATTRIBUTEDSTRING) || defined(USE_TI_UIIOSATTRIBUTEDSTRING)
#import "TiUIAttributedStringProxy.h"
#import "TiProxy.h"
#import "TiUtils.h"

@implementation TiUIAttributedStringProxy

-(void)_destroy
{
    RELEASE_TO_NIL(_attributedString)
    RELEASE_TO_NIL(attributes)
    [super _destroy];
}

-(void)_initWithProperties:(NSDictionary *)properties
{
    NSString* text = [properties valueForKey:@"text"];
    if(!text) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.text not set");
    }
    _attributedString = [[NSMutableAttributedString alloc] initWithString:text];
    attributes = [[NSMutableArray alloc] init];
    [super _initWithProperties:properties];
}

-(NSString*)apiName
{
    return @"Ti.UI.AttributedString";
}

-(NSMutableAttributedString*)attributedString
{
    return _attributedString;
}

-(void)addAttribute:(id)args
{
    ENSURE_SINGLE_ARG(args, NSDictionary)
    
    NSNumber *type = [args valueForKey:@"type"];
    if(!type) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.type not set");
        return;
    }
    
    id value = [args valueForKey:@"value"];
    if(!value) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.value not set");
        return;
    }
    
    NSArray *range = [args valueForKey:@"range"];
    if(!range) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.range not set");
        return;
    }
    if([range count] < 2) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.range must be an array of two numbers");
        return;
    }
    // Kosso moved
    NSInteger from = [TiUtils intValue:[range objectAtIndex:0]];
    NSInteger length = [TiUtils intValue:[range objectAtIndex:1]];
    NSRange rangeValue = NSMakeRange(from, length);
    
    // Kosso added
    BOOL isImage = NO;
    double width = 0;
    if([args valueForKey:@"width"]){
        // For image attachment scaling
        width = [TiUtils doubleValue:[args valueForKey:@"width"]];
        NSLog(@"[INFO] requested attachment width %f", width);
    }
    
    NSString *attrName = nil;
    NSString *errorMessage = nil;
    id attrValue = nil;
    switch ([type integerValue]) {
            
        case AttributeNameFont:
            attrName = NSFontAttributeName;
            WebFont *strFont = [TiUtils fontValue:value def:[WebFont defaultFont]];
            attrValue = [strFont font];
            break;
            
        case AttributeNameParagraphStyle:
            attrName = NSParagraphStyleAttributeName;
            // errorMessage = @"ATTRIBUTE_PARAGRAPH_STYLE not yet supported";
            // Kosso added 
            // Build a paragraphStyle with the line spacing set to the value
            NSMutableParagraphStyle *cparagraphStyle = [[NSMutableParagraphStyle alloc] init];
            // Might not need these two extra ones. 
            // cparagraphStyle.lineHeightMultiple = [TiUtils doubleValue:value];
            // cparagraphStyle.maximumLineHeight = [TiUtils doubleValue:value];
            cparagraphStyle.minimumLineHeight = [TiUtils doubleValue:value];
            attrValue = cparagraphStyle;

            // The caret will also need adjusting. Which apparently needs a delegate of LayoutManager. 

            break;
            
        case AttributeNameForegroundColor:
            attrName = NSForegroundColorAttributeName;
            attrValue = [[TiUtils colorValue:value] _color];
            break;
            
        case AttributeNameBackgroundColor:
            attrName = NSBackgroundColorAttributeName;
            attrValue = [[TiUtils colorValue:value] _color];
            break;
            
        case AttributeNameLigature:
            attrName = NSLigatureAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameKern:
            attrName = NSKernAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameStrikethroughStyle:
            attrName = NSStrikethroughStyleAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameUnderlineStyle:
            attrName = NSUnderlineStyleAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameStrokeColor:
            attrName = NSStrokeColorAttributeName;
            attrValue = [[TiUtils colorValue:value] _color];
            break;
            
        case AttributeNameStrokeWidth:
            attrName = NSStrokeWidthAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameShadow:
            attrName = NSShadowAttributeName;
            attrValue = [TiUtils shadowValue:value];
            break;
            
        case AttributeNameVerticalGlyphForm:
            attrName = NSVerticalGlyphFormAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameWritingDirection:
            attrName = NSWritingDirectionAttributeName;
            NSMutableArray *array = [NSMutableArray array];
            [array addObject:[TiUtils numberFromObject: value]];
            attrValue = array;
            break;
            
        case AttributeNameTextEffect:
            attrName = NSTextEffectAttributeName;
            attrValue = [TiUtils stringValue:value];
            break;
            
        case AttributeNameAttachment:
            attrName = NSAttachmentAttributeName;
            // Kosso attempting to add support.. 
            /*
            // Adding the attribute like this in JS. Providing a value for the image url and width for requesting any scaing. 
            {
                type: Titanium.UI.ATTRIBUTE_ATTACHMENT,
                value: 'file://' + Ti.Filesystem.resourcesDirectory+ 'test.png',
                width: 40, // parseFloat(Ti.Platform.displayCaps.platformWidth - 20),
                range: [5,  0]
            }
            // range only need start index for insertion. 
            */
            
            isImage = YES;
            // NSLog(@"[INFO] attachment url  %@", value);
            NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
            // textAttachment.image = [UIImage imageNamed:@"sample_image.jpg"];
            textAttachment.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:value]]];            
            CGFloat oldWidth = textAttachment.image.size.width;
            // NSLog(@"[INFO] attachment image original width is:  %f", oldWidth);
            CGFloat scaleFactor = oldWidth / (CGFloat)width;
            textAttachment.image = [UIImage imageWithCGImage:textAttachment.image.CGImage scale:scaleFactor orientation:UIImageOrientationUp];
            NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
            
            //[_attributedString replaceCharactersInRange:rangeValue withAttributedString:attrStringWithImage];
            [_attributedString insertAttributedString:attrStringWithImage atIndex:from];
            // errorMessage = @"ATTRIBUTE_ATTACHMENT not yet supported";
            // Well, not officially.. 

            break;
            
        case AttributeNameLink:
            attrName = NSLinkAttributeName;
            attrValue = [TiUtils stringValue:value];
            break;
            
        case AttributeNameBaselineOffset:
            attrName = NSBaselineOffsetAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameUnderlineColor:
            attrName = NSUnderlineColorAttributeName;
            attrValue = [[TiUtils colorValue:value] _color];
            break;
            
        case AttributeNameStrikethroughColor:
            attrName = NSStrikethroughColorAttributeName;
            attrValue = [[TiUtils colorValue:value] _color];
            break;
            
        case AttributeNameObliqueness:
            attrName = NSObliquenessAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameExpansion:
            attrName = NSExpansionAttributeName;
            attrValue = [TiUtils numberFromObject:value];
            break;
            
        case AttributeNameLineBreak:
            attrName = NSParagraphStyleAttributeName;
            NSMutableParagraphStyle *paragraphStyle = [[[NSMutableParagraphStyle alloc] init] autorelease];
            NSNumber * num = [TiUtils numberFromObject:value];
            [paragraphStyle setLineBreakMode:[num unsignedIntegerValue]];
            attrValue = paragraphStyle;
            break;
    }
    if(errorMessage != nil) {
        DebugLog(@"[WARN] Ti.UI.%@", errorMessage);
        return;
    }
    if(!attrValue) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.value is null");
        return;
    }
    if(!attrName) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.type is null");
        return;
    }
    

    
    if((from + length) > [_attributedString length]) {
        DebugLog(@"[WARN] Ti.UI.AttributedString.range must me equal to or smaller than the text length");
        return;
    }
    [attributes addObject: args];

    if(!isImage){
        [_attributedString addAttribute:attrName value:attrValue range:rangeValue];
    }
    // Images are inserted/replaced into the _attributedString during the attributes switch above.
    // [_attributedString replaceCharactersInRange:NSMakeRange(6, 1) withAttributedString:attrStringWithImage];
    
}

-(id)attributes
{
    return attributes;
}

-(void)setAttributes:(id)args
{
    ENSURE_ARRAY(args)
    
    for(NSDictionary *attr in attributes) {
        
        NSString *name = [attr valueForKey:@"type"];
        NSArray *range = [attr valueForKey:@"range"];
        
        NSInteger from = [[range objectAtIndex:0] integerValue];
        NSInteger length = [[range objectAtIndex:1] integerValue];
        
        NSRange rangeValue = NSMakeRange(from, length);
        
        [_attributedString removeAttribute:name range:rangeValue];
    }
    [attributes removeAllObjects];
    
    for (id jsAttribute in args) {
        [self addAttribute:jsAttribute];
    }
}

@end

#endif