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问题:

I have a textView that allow user to enter NSAttributedString, convert into html string and then store into database. I also have code to convert the html string back and display in textView for editing. The conversion codes I have are

extension String {     func htmlAttributedString() -> NSAttributedString? {         guard let data = self.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return nil }         guard let html = try? NSMutableAttributedString(             data: data,             options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],             documentAttributes: nil) else { return nil }         return html     } }  extension NSAttributedString {     func htmlString() -> String? {         let documentAttributes = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]         do {             let htmlData = try self.data(from: NSMakeRange(0, self.length), documentAttributes:documentAttributes)             if let htmlString = String(data:htmlData, encoding:String.Encoding.utf8) { return htmlString }         }         catch {}         return nil     } }

However the problem is that every time when I save and display the string, all font size increases. For example, I have a html string

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="Content-Style-Type" content="text/css"> <title></title> <meta name="Generator" content="Cocoa HTML Writer"> <style type="text/css"> p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px '.SF UI Text'; color: #000000} span.s1 {font-family: '.SFUIText'; font-weight: normal; font-style: normal; font-size: 17.00pt} </style> </head> <body> <p class="p1"><span class="s1">text</span></p> </body> </html>

After I convert it into NSAttributedString and back again, everything else are the same but the css lines are changed to this.

<style type="text/css"> p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; line-height: 28.0px; font: 22.7px '.SF UI Text'; color: #000000; -webkit-text-stroke: #000000} span.s1 {font-family: '.SFUIText'; font-weight: normal; font-style: normal; font-size: 22.67pt; font-kerning: none} </style>

Am I missing anything? Any helps are appreciated!

回答1:

Try this method I found from some help and then converted to Swift 3:

func newAttrSize(blockQuote: NSAttributedString) -> NSAttributedString {     let yourAttrStr = NSMutableAttributedString(attributedString: blockQuote)     yourAttrStr.enumerateAttribute(.font, in: NSMakeRange(0, yourAttrStr.length), options: .init(rawValue: 0)) {         (value, range, stop) in         if let font = value as? UIFont {             let resizedFont = font.withSize(font.pointSize * 0.75)             yourAttrStr.addAttribute(.font, value: resizedFont, range: range)         }     }      return yourAttrStr }

回答2:

I got the same problem, the simple solution is you just convert to RTF format instead of HTML. It 's worked fine.

文章来源: Swift - Font size increases when converting html string to attributed string and back again

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