Created
October 23, 2013 12:36
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HTML -> NSAttributedString using only UIKit
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| + (NSAttributedString *)artsyBodyTextAttributedStringFromHTML:(NSString *)HTML withFont:(UIFont *)font | |
| { | |
| 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]; | |
| } | |
| + (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.fpx;", font.fontName, roundf(font.pointSize)]; | |
| } | |
| if (dictionary[NSParagraphStyleAttributeName]) { | |
| NSParagraphStyle *style = dictionary[NSParagraphStyleAttributeName]; | |
| [cssString appendFormat:@"line-height:%0.1f 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; | |
| } |
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