Created
August 7, 2013 11:38
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iOS7 APIs for creating attributed strings from HTML
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| // | |
| // NSAttributedString+StringFromHTML.m | |
| // Artsy | |
| // | |
| // Created by Orta on 06/08/2013. | |
| // Copyright (c) 2013 Art.sy. All rights reserved. | |
| // | |
| // This doesn't produce acceptable enough results, and thus is relagated here for another day sometime | |
| #import "NSAttributedString+StringFromHTML.h" | |
| @implementation NSAttributedString (StringFromHTML) | |
| + (NSAttributedString *)artsyBodyTextAttributedStringFromHTML:(NSString *)HTML | |
| { | |
| UIFont *font = [ARTheme defaultTheme].fonts[@"PostBody"]; | |
| NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init]; | |
| style.lineHeightMultiple = 1.2; | |
| style.paragraphSpacing = font.pointSize * .5; | |
| NSDictionary *textParams = @{ | |
| NSFontAttributeName : font, | |
| NSParagraphStyleAttributeName : style, | |
| NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) | |
| }; | |
| return [self _attributedStringWithTextParams:textParams andHTML:HTML]; | |
| } | |
| + (NSAttributedString *)artsyPostTitleTextAttributedStringFromHTML:(NSString *)HTML | |
| { | |
| UIFont *font = [ARTheme defaultTheme].fonts[@"PostTitle"]; | |
| NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init]; | |
| style.lineHeightMultiple = 1.1; | |
| style.paragraphSpacing = font.pointSize * .75; | |
| NSDictionary *textParams = @{ | |
| NSFontAttributeName : font, | |
| NSForegroundColorAttributeName : [UIColor orangeColor] | |
| }; | |
| return [self _attributedStringWithTextParams:textParams andHTML:HTML]; | |
| } | |
| /// As we can't use the attributed string attributes params, so generate CSS from it | |
| + (NSString *)_cssStringFromAttributedStringAttributes:(NSDictionary *)dictionary | |
| { | |
| NSMutableString *cssString = [NSMutableString stringWithString:@"<style> p {"]; | |
| if ([dictionary objectForKey:NSFontAttributeName]) { | |
| UIFont *font = dictionary[NSFontAttributeName]; | |
| [cssString appendFormat:@"font-family:'%@'; font-size: %0.1fpx;", font.fontName, roundf(font.pointSize)]; | |
| } | |
| if (dictionary[NSParagraphStyleAttributeName]) { | |
| NSParagraphStyle *style = dictionary[NSParagraphStyleAttributeName]; | |
| [cssString appendFormat:@"line-height:%f em;", style.lineHeightMultiple]; | |
| } | |
| [cssString appendString:@"}"]; | |
| [cssString appendString:@"</style><body>"]; | |
| return cssString; | |
| } | |
| + (NSAttributedString *)_attributedStringWithTextParams:(NSDictionary *)textParams andHTML:(NSString *)HTML | |
| { | |
| NSDictionary *importParams = @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }; | |
| NSError *error = nil; | |
| NSString *formatString = [[self _cssStringFromAttributedStringAttributes:textParams] stringByAppendingFormat:@"%@</body>", HTML]; | |
| NSData *stringData = [formatString dataUsingEncoding:NSUnicodeStringEncoding] ; | |
| NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:stringData options:importParams documentAttributes:NULL error:&error]; | |
| if (error) { | |
| ARErrorLog(@"Error creating NSAttributedString from HTML %@", error.localizedDescription); | |
| return nil; | |
| } | |
| return attributedString; | |
| } | |
| @end |
sure thing
How to convert NSAttributedString in HTML string?
I am able to convert this. May be this help someone else :
NSDictionary *documentAttributes = [NSDictionary dictionaryWithObjectsAndKeys:NSHTMLTextDocumentType, NSDocumentTypeDocumentAttribute, nil];
NSData *htmlData = [string dataFromRange:NSMakeRange(0, string.length) documentAttributes:documentAttributes error:NULL];
NSString *htmlString = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];
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I would like to request permission to use a derived version of this basic function in my DoubleNodePod library.