html转换为string,NSAttributedString和HTMLString之间的转换

自制富文本编辑器

NSAttributedString to HTMLString

NSDictionary *documentAttributes &＃61; &＃64;{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType};

NSData *htmlData &＃61; [attributeString dataFromRange:NSMakeRange(0, attributeString.length) documentAttributes:documentAttributes error:NULL];

NSString *htmlString &＃61; [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];

HTMLString to NSAttributedString

NSAttributedString* attributeString &＃61; [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]

options:&＃64;{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,

NSCharacterEncodingDocumentAttribute: &＃64;(NSUTF8StringEncoding)}

documentAttributes:nil error:nil];

注意事项&＃xff1a;

NSAttributedString 转为htmlstring后&＃xff0c;再转换回NSAttributedString字体会变大&＃xff0c;经过查找资料发现是系统问题。stackoverflow上面给出了解决办法&＃xff1a;

static CGFloat const kListsLeading &＃61; 10.0;

static CGFloat const kListsAdditionalShift &＃61; 4.0;

&＃43; (NSAttributedString *)decreaseFontSizeBecauseOfAppleMagic:(NSAttributedString *)astr

{

NSMutableAttributedString *mastr &＃61; [astr mutableCopy];

[mastr enumerateAttribute:NSFontAttributeName inRange:NSMakeRange(0, astr.length) options:0 usingBlock:^(UIFont *_Nullable value, NSRange range, BOOL *_Nonnull stop) {

if (value) {

UIFont *font &＃61; [value fontWithSize:value.pointSize * 0.75];

[mastr addAttribute:NSFontAttributeName value:font range:range];

}

}];

[mastr enumerateAttribute:NSParagraphStyleAttributeName inRange:NSMakeRange(0, astr.length) options:0 usingBlock:^(NSParagraphStyle *_Nullable value, NSRange range, BOOL *_Nonnull stop) {

if (value) {

NSMutableParagraphStyle *style &＃61; [value mutableCopy];

style.minimumLineHeight *&＃61; 0.75;

if (style.firstLineHeadIndent &＃61;&＃61; style.headIndent) {

style.firstLineHeadIndent *&＃61; 0.75;

style.headIndent *&＃61; 0.75;

}

else if (style.firstLineHeadIndent

CGFloat shift &＃61; (kListsLeading - style.firstLineHeadIndent);

style.headIndent &＃43;&＃61; shift &＃43; kListsAdditionalShift;

style.firstLineHeadIndent &＃61; kListsLeading;

NSMutableArray *tabs &＃61; [NSMutableArray array];

NSInteger index &＃61; 0;

for (NSTextTab *tab in style.tabStops) {

[tabs addObject:[[NSTextTab alloc] initWithTextAlignment:tab.alignment location:tab.location &＃43; shift &＃43; kListsAdditionalShift * (index ? 1 : 0) options:tab.options]];

index&＃43;&＃43;;

}

style.tabStops &＃61; tabs;

}

style.tailIndent *&＃61; 0.75;

[mastr addAttribute:NSParagraphStyleAttributeName value:style range:range];

}

}];

return [mastr copy];

}