Swift: Display HTML data in a label or textView

HtmlIosSwiftUitextviewNsattributedstring

Html Problem Overview

I have some HTML data, which contains headings, paragraphs , images and lists tags.

Is there a way to display this data in one UITextView or UILabel?

Html Solutions

Solution 1 - Html

For Swift 5:

extension String {
    var htmlToAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else { return nil }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            return nil
        }
    }
    var htmlToString: String {
        return htmlToAttributedString?.string ?? ""
    }
}

Then, whenever you want to put HTML text in a UITextView use:

textView.attributedText = htmlText.htmlToAttributedString

Solution 2 - Html

Here is a Swift 3 version:

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
}

I found issues with some of the other answers here and it took me a bit to get this right. I set the line break mode and number of lines so that the label sized appropriately when the HTML spanned multiple lines.

Solution 3 - Html

Add this extension to convert your html code to a regular string:

    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 ?? ""
        }
}

And then you show your String inside an UITextView Or UILabel

textView.text = yourString.html2String or

label.text = yourString.html2String

Solution 4 - Html

For Swift 5, it also can load css. 

extension String {
    public var convertHtmlToNSAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else {
            return nil
        }
        do {
            return try NSAttributedString(data: data,options: [.documentType: NSAttributedString.DocumentType.html,.characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        }
        catch {
            print(error.localizedDescription)
            return nil
        }
    }
    
    public func convertHtmlToAttributedStringWithCSS(font: UIFont? , csscolor: String , lineheight: Int, csstextalign: String) -> NSAttributedString? {
        guard let font = font else {
            return convertHtmlToNSAttributedString
        }
        let modifiedString = "<style>body{font-family: '\(font.fontName)'; font-size:\(font.pointSize)px; color: \(csscolor); line-height: \(lineheight)px; text-align: \(csstextalign); }</style>\(self)";
        guard let data = modifiedString.data(using: .utf8) else {
            return nil
        }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        }
        catch {
            print(error)
            return nil
        }
    }
}

After that, go to your string you want to convert to NSAttributedString and place it like the example below:

myUILabel.attributedText = "Swift is awesome&#33;&#33;&#33;".convertHtmlToAttributedStringWithCSS(font: UIFont(name: "Arial", size: 16), csscolor: "black", lineheight: 5, csstextalign: "center")

enter image description here Here’s what every parameter takes:

  • font: Add your font as usually do in a UILabel/UITextView, using UIFont with the name of your custom font and the size.
  • csscolor: Either add color in HEX format, like "#000000" or use the name of the color, like "black".
  • lineheight: It’s the space between the lines when you have multiple lines in a UILabel/UITextView.
  • csstextalign: It’s the alignment of the text, the value that you need to add is "left" or "right" or "center" or "justify"

Reference: https://johncodeos.com/how-to-display-html-in-uitextview-uilabel-with-custom-color-font-etc-in-ios-using-swift/

Solution 5 - Html

I had problems to change attributes of text after that, and I could see others asking why...

So best answer is to use extension with NSMutableAttributedString instead:

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
    }
 }

}

And then you can use it this way:

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
            }

Solution 6 - Html

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

Solution 7 - Html

I'm using this:

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
        }
    }
}

Solution 8 - Html

Swift 5

extension UIColor {
	var hexString: String {
		let components = cgColor.components
		let r: CGFloat = components?[0] ?? 0.0
		let g: CGFloat = components?[1] ?? 0.0
		let b: CGFloat = components?[2] ?? 0.0

		let hexString = String(format: "#%02lX%02lX%02lX", lroundf(Float(r * 255)), lroundf(Float(g * 255)),
							   lroundf(Float(b * 255)))

		return hexString
	}
}

extension String {
    func htmlAttributed(family: String?, size: CGFloat, color: UIColor) -> NSAttributedString? {
        do {
            let htmlCSSString = "<style>" +
                "html *" +
                "{" +
                "font-size: \(size)pt !important;" +
                "color: #\(color.hexString) !important;" +
                "font-family: \(family ?? "Helvetica"), Helvetica !important;" +
            "}</style> \(self)"
            
            guard let data = htmlCSSString.data(using: String.Encoding.utf8) else {
                return nil
            }
            
            return try NSAttributedString(data: data,
                                          options: [.documentType: NSAttributedString.DocumentType.html,
                                                    .characterEncoding: String.Encoding.utf8.rawValue],
                                          documentAttributes: nil)
        } catch {
            print("error: ", error)
            return nil
        }
    }
}

And final you can create UILabel:

func createHtmlLabel(with html: String) -> UILabel {
    let htmlMock = """
    <b>hello</b>, <i>world</i>
    """
    
    let descriprionLabel = UILabel()
    descriprionLabel.attributedText = htmlMock.htmlAttributed(family: "YourFontFamily", size: 15, color: .red)

    return descriprionLabel
}

Result:

enter image description here

See tutorial:

https://medium.com/@valv0/a-swift-extension-for-string-and-html-8cfb7477a510

Solution 9 - Html

Swift 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 ?? ""
 }
}

Solution 10 - Html

Thx for the above answer here is 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 ?? ""
    }
}

Solution 11 - Html

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.

Solution 12 - Html

extension UITextView {
    func setHTMLFromString(htmlText: String) {
        let modifiedFont = String(format:"<span style=\"font-family: '-apple-system', 'HelveticaNeue'; font-size: \(self.font!.pointSize)\">%@</span>", htmlText)

        let attrStr = try! NSAttributedString(
            data: modifiedFont.data(using: .utf8, allowLossyConversion: true)!,
            options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue],
            documentAttributes: nil)

        self.attributedText = attrStr
    }
}

Solution 13 - Html

Display images and text paragraphs is not possible in a UITextView or UILabel, to this, you must use a UIWebView.

Just add the item in the storyboard, link to your code, and call it to load the URL.

OBJ-C

NSString *fullURL = @"http://conecode.com";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[_viewWeb loadRequest:requestObj];

Swift

let url = NSURL (string: "http://www.sourcefreeze.com");
let requestObj = NSURLRequest(URL: url!);
viewWeb.loadRequest(requestObj);

Step by step tutorial. http://sourcefreeze.com/uiwebview-example-using-swift-in-ios/

Solution 14 - Html

If you want HTML, with images and a list, this isn't support by UILabel. However, I've found YYText does the trick.

Solution 15 - Html

Swift 5

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: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html],
            documentAttributes: nil) else { return nil }
        return html
    }
}

Call:

myLabel.attributedText = "myString".htmlAttributedString()

Solution 16 - Html

I know that this will look little over the top but ... This code will add html support to UILabel, UITextView, UIButton and you can easily add this support to any view that has attributed string support :

public protocol CSHasAttributedTextProtocol: AnyObject {
    func attributedText() -> NSAttributedString?
    func attributed(text: NSAttributedString?) -> Self
}

extension UIButton: CSHasAttributedTextProtocol {
    public func attributedText() -> NSAttributedString? {
        attributedTitle(for: .normal)
    }

    public func attributed(text: NSAttributedString?) -> Self {
        setAttributedTitle(text, for: .normal); return self
    }
}

extension UITextView: CSHasAttributedTextProtocol {
    public func attributedText() -> NSAttributedString? { attributedText }

    public func attributed(text: NSAttributedString?) -> Self { attributedText = text; return self }
}

extension UILabel: CSHasAttributedTextProtocol {
    public func attributedText() -> NSAttributedString? { attributedText }

    public func attributed(text: NSAttributedString?) -> Self { attributedText = text; return self }
}

public extension CSHasAttributedTextProtocol
        where Self: CSHasFontProtocol, Self: CSHasTextColorProtocol {
    @discardableResult
    func html(_ text: String) -> Self { html(text: text) }

    @discardableResult
    func html(text: String) -> Self {
        let html = """
                   <html><body style="color:\(textColor!.hexValue()!); 
                                font-family:\(font()!.fontName); 
                                font-size:\(font()!.pointSize);">\(text)</body></html>
                   """
        html.data(using: .unicode, allowLossyConversion: true).notNil { data in
            attributed(text: try? NSAttributedString(data: data, options: [
                .documentType: NSAttributedString.DocumentType.html,
                .characterEncoding: NSNumber(value: String.Encoding.utf8.rawValue)
            ], documentAttributes: nil))
        }
        return self
    }
}


public protocol CSHasFontProtocol: AnyObject {
    func font() -> UIFont?
    func font(_ font: UIFont?) -> Self
}

extension UIButton: CSHasFontProtocol {
    public func font() -> UIFont? { titleLabel?.font }

    public func font(_ font: UIFont?) -> Self { titleLabel?.font = font; return self }
}

extension UITextView: CSHasFontProtocol {
    public func font() -> UIFont? { font }

    public func font(_ font: UIFont?) -> Self { self.font = font; return self }
}

extension UILabel: CSHasFontProtocol {
    public func font() -> UIFont? { font }

    public func font(_ font: UIFont?) -> Self { self.font = font; return self }
}

public protocol CSHasTextColorProtocol: AnyObject {
    func textColor() -> UIColor?
    func text(color: UIColor?) -> Self
}

extension UIButton: CSHasTextColorProtocol {
    public func textColor() -> UIColor? { titleColor(for: .normal) }

    public func text(color: UIColor?) -> Self { setTitleColor(color, for: .normal); return self }
}

extension UITextView: CSHasTextColorProtocol {
    public func textColor() -> UIColor? { textColor }

    public func text(color: UIColor?) -> Self { textColor = color; return self }
}

extension UILabel: CSHasTextColorProtocol {
    public func textColor() -> UIColor? { textColor }

    public func text(color: UIColor?) -> Self { textColor = color; return self }
}

Solution 17 - Html

IF YOU HAVE A STRING WITH HTML CODE INSIDE YOU CAN USE:

extension String {
var utfData: Data? {
        return self.data(using: .utf8)
    }
    
    var htmlAttributedString: NSAttributedString? {
        guard let data = self.utfData else {
            return nil
        }
        do {
            return try NSAttributedString(data: data,
                                          options: [
                                            .documentType: NSAttributedString.DocumentType.html,
                                            .characterEncoding: String.Encoding.utf8.rawValue
                ], documentAttributes: nil)
        } catch {
            print(error.localizedDescription)
            return nil
        }
    }
    
    var htmlString: String {
        return htmlAttributedString?.string ?? self 
    }
}

AND IN YOUR CODE YOU USE:

label.text = "something".htmlString
Categories
Recommended Html Solutions
Recommended Ios Solutions
Recommended Swift Solutions
Recommended Uitextview Solutions
Recommended Nsattributedstring Solutions

Previous Solution:

Remove 'b' character do in front of a string literal in Python 3

PythonStringEncryptionBinary

Next Solution:

Selenium 2.53 not working on Firefox 47

JavaSeleniumFirefoxSelenium WebdriverSelenium Firefoxdriver

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionTalha Ahmad KhanView Question on Stackoverflow
Solution 1 - HtmlRoger CarvalhoView Answer on Stackoverflow
Solution 2 - HtmlgarieView Answer on Stackoverflow
Solution 3 - HtmlHimanshuView Answer on Stackoverflow
Solution 4 - HtmlZgpeaceView Answer on Stackoverflow
Solution 5 - HtmlKassy BarbView Answer on Stackoverflow
Solution 6 - HtmlVed RauniyarView Answer on Stackoverflow
Solution 7 - HtmlNikolay KhramchenkoView Answer on Stackoverflow
Solution 8 - HtmloscarrView Answer on Stackoverflow
Solution 9 - HtmlAlex MorelView Answer on Stackoverflow
Solution 10 - HtmlStephen ChenView Answer on Stackoverflow
Solution 11 - HtmlIyyappan RaviView Answer on Stackoverflow
Solution 12 - HtmlEmtyView Answer on Stackoverflow
Solution 13 - HtmlUlyssesView Answer on Stackoverflow
Solution 14 - HtmlChristopher Kevin HowellView Answer on Stackoverflow
Solution 15 - HtmlÁlvaro AgüeroView Answer on Stackoverflow
Solution 16 - HtmlRenetikView Answer on Stackoverflow
Solution 17 - HtmlPedro MenezesView Answer on Stackoverflow