我有一些HTML数据，其中包含标题，段落，图像和列表标签。
有没有办法在一个UITextView或UILabel中显示这些数据？
对于Swift 4：
extension String {
var htmlToAttributedString: NSAttributedString? {
guard let data = data(using: .utf8) else { return NSAttributedString() }
do {
return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
} catch {
return NSAttributedString()
}
}
var htmlToString: String {
return htmlToAttributedString?.string ?? ""
}
}
然后，只要您想将HTML文本放在UITextView中使用：
textView.attributedText = htmlText.htmlToAttributedString
在UITextView或UILabel中无法显示图像和文本段落，为此，您必须使用UIWebView。
只需在故事板中添加项目，链接到您的代码，然后调用它来加载URL。
OBJ-C
NSString *fullURL = @"http://conecode.com";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[_viewWeb loadRequest:requestObj];
迅速
let url = NSURL (string: "http://www.sourcefreeze.com");
let requestObj = NSURLRequest(URL: url!);
viewWeb.loadRequest(requestObj);
一步一步的教程。 http://sourcefreeze.com/uiwebview-example-using-swift-in-ios/
这里答案的答案是Swift 4.2
extension String {
var htmlToAttributedString: NSAttributedString? {
guard
let data = self.data(using: .utf8)
else { return nil }
do {
return try NSAttributedString(data: data, options: [
NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html,
NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue
], documentAttributes: nil)
} catch let error as NSError {
print(error.localizedDescription)
return nil
}
}
var htmlToString: String {
return htmlToAttributedString?.string ?? ""
}
}
这是一个Swift 3版本：
private func getHtmlLabel(text: String) -> UILabel {
let label = UILabel()
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.attributedString = stringFromHtml(string: text)
return label
}
private func stringFromHtml(string: String) -> NSAttributedString? {
do {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
if let d = data {
let str = try NSAttributedString(data: d,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
return str
}
} catch {
}
return nil
}
我在这里找到了一些其他答案的问题，我花了一些时间来做到这一点。我设置换行模式和行数，以便在HTML跨越多行时标签大小适当。
添加此扩展名以将您的html代码转换为常规字符串：
extension String {
var html2AttributedString: NSAttributedString? {
guard
let data = dataUsingEncoding(NSUTF8StringEncoding)
else { return nil }
do {
return try NSAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute:NSUTF8StringEncoding], documentAttributes: nil)
} catch let error as NSError {
print(error.localizedDescription)
return nil
}
}
var html2String: String {
return html2AttributedString?.string ?? ""
}
}
然后在UITextView或UILabel中显示您的String
textView.text = yourString.html2String或
label.text = yourString.html2String
Swift 3.0
var attrStr = try! NSAttributedString(
data: "<b><i>text</i></b>".data(using: String.Encoding.unicode, allowLossyConversion: true)!,
options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
label.attributedText = attrStr
我正在使用这个：
extension UILabel {
func setHTML(html: String) {
do {
let attributedString: NSAttributedString = try NSAttributedString(data: html.data(using: .utf8)!, options: [NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType], documentAttributes: nil)
self.attributedText = attributedString
} catch {
self.text = html
}
}
}
斯威夫特3
extension String {
var html2AttributedString: NSAttributedString? {
guard
let data = data(using: String.Encoding.utf8)
else { return nil }
do {
return try NSAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute:String.Encoding.utf8], documentAttributes: nil)
} catch let error as NSError {
print(error.localizedDescription)
return nil
}
}
var html2String: String {
return html2AttributedString?.string ?? ""
}
}
之后我在更改文本属性方面遇到了问题，我可以看到其他人问为什么......
所以最好的答案是使用NSMutableAttributedString扩展：
extension String {
var htmlToAttributedString: NSMutableAttributedString? {
guard let data = data(using: .utf8) else { return nil }
do {
return try NSMutableAttributedString(data: data,
options: [.documentType: NSMutableAttributedString.DocumentType.html,
.characterEncoding: String.Encoding.utf8.rawValue],
documentAttributes: nil)
} catch let error as NSError {
print(error.localizedDescription)
return nil
}
}
}
然后你可以这样使用它：
if let labelTextFormatted = text.htmlToAttributedString {
let textAttributes = [
NSAttributedStringKey.foregroundColor: UIColor.white,
NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 13)
] as [NSAttributedStringKey: Any]
labelTextFormatted.addAttributes(textAttributes, range: NSRange(location: 0, length: labelTextFormatted.length))
self.contentText.attributedText = labelTextFormatted
}
试试这个：
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 ""
}
希望它有所帮助。
如果您想要HTML，包含图像和列表，UILabel不支持此功能。但是，我发现YYText可以解决问题。