Created
May 27, 2021 07:08
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SwiftUI Text with HTML via NSAttributedString
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| // full recipe at https://swiftuirecipes.com/blog/swiftui-text-with-html-via-nsattributedstring | |
| extension Text { | |
| init(html htmlString: String, | |
| raw: Bool = false, | |
| size: CGFloat? = nil, | |
| fontFamily: String = "-apple-system") { | |
| let fullHTML: String | |
| if raw { | |
| fullHTML = htmlString | |
| } else { | |
| var sizeCss = "" | |
| if let size = size { | |
| sizeCss = "font-size: \(size)px;" | |
| } | |
| fullHTML = """ | |
| <!doctype html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| font-family: \(fontFamily); | |
| \(sizeCss) | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| \(htmlString) | |
| </body> | |
| </html> | |
| """ | |
| } | |
| let attributedString: NSAttributedString | |
| if let data = fullHTML.data(using: .unicode), | |
| let attrString = try? NSAttributedString(data: data, | |
| options: [.documentType: NSAttributedString.DocumentType.html], | |
| documentAttributes: nil) { | |
| attributedString = attrString | |
| } else { | |
| attributedString = NSAttributedString() | |
| } | |
| self.init(attributedString) | |
| } | |
| init(_ attributedString: NSAttributedString) { | |
| self.init("") | |
| attributedString.enumerateAttributes(in: NSRange(location: 0, length: attributedString.length), options: []) { (attrs, range, _) in | |
| let string = attributedString.attributedSubstring(from: range).string | |
| var text = Text(string) | |
| if let font = attrs[.font] as? UIFont { | |
| text = text.font(.init(font)) | |
| } | |
| if let color = attrs[.foregroundColor] as? UIColor { | |
| text = text.foregroundColor(Color(color)) | |
| } | |
| if let kern = attrs[.kern] as? CGFloat { | |
| text = text.kerning(kern) | |
| } | |
| if #available(iOS 14.0, *) { | |
| if let tracking = attrs[.tracking] as? CGFloat { | |
| text = text.tracking(tracking) | |
| } | |
| } | |
| if let strikethroughStyle = attrs[.strikethroughStyle] as? NSNumber, strikethroughStyle != 0 { | |
| if let strikethroughColor = (attrs[.strikethroughColor] as? UIColor) { | |
| text = text.strikethrough(true, color: Color(strikethroughColor)) | |
| } else { | |
| text = text.strikethrough(true) | |
| } | |
| } | |
| if let underlineStyle = attrs[.underlineStyle] as? NSNumber, | |
| underlineStyle != 0 { | |
| if let underlineColor = (attrs[.underlineColor] as? UIColor) { | |
| text = text.underline(true, color: Color(underlineColor)) | |
| } else { | |
| text = text.underline(true) | |
| } | |
| } | |
| if let baselineOffset = attrs[.baselineOffset] as? NSNumber { | |
| text = text.baselineOffset(CGFloat(baselineOffset.floatValue)) | |
| } | |
| self = self + text | |
| } | |
| } | |
| } |
@andredewaard AttributeGraph: cycle detected is an internal SwiftUI bug (not an error, a bug) and can't be worked around. It likely means that your entire view hierarchy is structured in a way that SwiftUI can't support (even though it should).
Somehow it crashes on Line 33 when putting inside a ForEach
ForEach(contextTexts, id: \.self) { string in
Spacer(minLength: 8)
VStack(alignment: .leading) {
Text(html: contextTexts, raw: false, size: 16)
.frame(maxWidth: .infinity, alignment: .leading)
}
}
var contextTexts: [String] = [
"<p>Test</p>","<p>Test</p>"
]
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Cant get this to work. Keep getting this error multiple times and will not render anything.
Would be great if i get this to work.
I get the same error with the new SwiftUI 3 version