我有一个 textView,允许用户输入 NSAttributedString,转换成 html 字符串,然后存储到数据库中。我还有将 html 字符串转换回并显示在 textView 中进行编辑的代码。我的转换代码是
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
}
}
但是问题是,每次我保存和显示字符串时,所有字体大小都会增加。比如我有一个html字符串
<!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>
在我将它转换为 NSAttributedString 并再次转换回来后,其他一切都一样,但 css 行更改为此。
<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>
我错过了什么吗?任何帮助表示赞赏!
最佳答案
试试这个我从一些帮助中找到的方法,然后转换为 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
}
关于ios - Swift - 将 html 字符串转换为属性字符串并再次返回时,字体大小会增加,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44590184/