如何在ios标签中显示html格式的文本
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在android中，它有像这样的.setText(Html.fromHtml(somestring));
Set TextView text from html-formatted string resource in XML
我想知道ios中是否有相同的内容？
我搜索并找到这个帖子：
How to show HTML text from API on the iPhone?
但它建议使用UIWebView。我需要在每个表格单元格中显示html格式的字符串，所以我认为每行1个webview似乎有点沉重。
那还有其他选择吗？
谢谢。
答案
Swift 3.0
do {
let attrStr = try NSAttributedString(
data: "<b><i>text</i></b>".data(using: String.Encoding.unicode, allowLossyConversion: true)!,
options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
label.attributedText = attrStr
} catch let error {
}
另一答案
对于Swift 2.0：
var attrStr = try! NSAttributedString(
data: "<b><i>text</i></b>".dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
label.attributedText = attrStr
另一答案
你可以尝试一个属性字符串：
var attrStr = NSAttributedString(
data: "<b><i>text</i></b>".dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true),
options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil,
error: nil)
label.attributedText = attrStr
另一答案
斯威夫特4
import UIKit
let htmlString = "<html><body> Some <b>html</b> string </body></html>"
// works even without <html><body> </body></html> tags, BTW
let data = htmlString.data(using: String.Encoding.unicode)! // mind "!"
let attrStr = try? NSAttributedString( // do catch
data: data,
options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html],
documentAttributes: nil)
// suppose we have an UILabel, but any element with NSAttributedString will do
label.attributedText = attrStr
Supplement: controlling the font of resulting formatted string
要使用正确缩放（即相对于用户设置）系统（或任何其他）字体，您可以执行以下操作。
let newFont = UIFontMetrics.default.scaledFont(for: UIFont.systemFont(ofSize: UIFont.systemFontSize)) // The same is possible for custom font.
let mattrStr = NSMutableAttributedString(attributedString: attrStr!)
mattrStr.beginEditing()
mattrStr.enumerateAttribute(.font, in: NSRange(location: 0, length: mattrStr.length), options: .longestEffectiveRangeNotRequired) { (value, range, _) in
if let oFont = value as? UIFont, let newFontDescriptor = oFont.fontDescriptor.withFamily(newFont.familyName).withSymbolicTraits(oFont.fontDescriptor.symbolicTraits) {
let nFont = UIFont(descriptor: newFontDescriptor, size: newFont.pointSize)
mattrStr.removeAttribute(.font, range: range)
mattrStr.addAttribute(.font, value: nFont, range: range)
}
}
mattrStr.endEditing()
label.attributedText = mattrStr
另一答案
Try this:
let label : UILable! = String.stringFromHTML("html String")
func stringFromHTML( string: String?) -> String
{
do{
let str = try NSAttributedString(data:string!.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true
)!, options:[NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSNumber(unsignedLong: NSUTF8StringEncoding)], documentAttributes: nil)
return str.string
} catch
{
print("html error
",error)
}
return ""
}
Hope its helpful.
另一答案
对我来说，保罗的回答是有效的。但对于自定义字体，我不得不放下黑客攻击。
//Please take care of force unwrapping
let data = htmlString.data(using: String.Encoding.unicode)!
let mattrStr = try! NSMutableAttributedString(
data: data,
options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html],
documentAttributes: nil)
let normalFont = UIFontMetrics.default.scaledFont(for: UIFont(name: "NormalFontName", size: 15.0)!)//
let boldFont = UIFontMetrics.default.scaledFont(for: UIFont(name: "BoldFontName", size: 15.0)!)
mattrStr.beginEditing()
mattrStr.enumerateAttribute(.font, in: NSRange(location: 0, length: mattrStr.length), options: .longestEffectiveRangeNotRequired) { (value, range, _) in
if let oFont = value as? UIFont{
mattrStr.removeAttribute(.font, range: range)
if oFont.fontName.contains("Bold"){
mattrStr.addAttribute(.font, value: boldFont, range: range)
}
else{
mattrStr.addAttribute(.font, value: normalFont, range: range)
}
}
}
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