Html 如何在ios标签中显示html格式的文本
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How to display html formatted text in ios label
提问by hap497
I would like to display htmlformatted text on a UILabelin IOS.
我想在 IOS 中显示html格式的文本UILabel。
In Android, it has api like this .setText(Html.fromHtml(somestring));
在Android中，它有这样的api .setText(Html.fromHtml(somestring));
Set TextView text from html-formatted string resource in XML
从 XML 格式的 html 格式字符串资源设置 TextView 文本
I would like to know what / if there is an equivalent in ios?
我想知道什么/是否在 ios 中有等价物？
I search and find this thread:
我搜索并找到了这个线程：
How to show HTML text from API on the iPhone?
如何在 iPhone 上显示来自 API 的 HTML 文本？
But it suggests using UIWebView. I need to display html formatted string in each table cell, so I think have 1 webviewper row seems a bit heavy.
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webview每行1个似乎有点重。
Is that any other alternative?
那还有其他选择吗？
Thank you.
谢谢你。
回答by ?ernando Valle
Swift 3.0
斯威夫特 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 {
}
回答by Daniele B
for Swift 2.0:
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
回答by Connor
You could try an attributed string:
您可以尝试使用属性字符串：
var attrStr = NSAttributedString(
data: "<b><i>text</i></b>".dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true),
options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil,
error: nil)
label.attributedText = attrStr
回答by Paul B
Swift 4
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
补充：控制生成的格式化字符串的字体
To use properly scaled (i.e. with respect to user settings) system (or any other) font you may do the following.
要使用适当缩放（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
回答by Pranav Pravakar
For me, Paul's answer worked. But for custom fonts I had to put following hack.
对我来说，保罗的回答奏效了。但是对于自定义字体，我不得不进行以下 hack。
//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)
}
}
}
回答by Er. Vihar
Objective-C Version:
Objective-C 版本：
NSError *error = nil;
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:contentData
options:@{NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType}
documentAttributes:nil error:&error];
This is just the Objective-C conversion of the above answers. All the answers above are right and reference taken from the above answersfor this.
这只是上述答案的Objective-C转换。以上所有答案都是正确的，参考以上答案。
回答by Ved Rauniyar
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\n",error)
}
return ""
}
Hope its helpful.
