HTML Attributed Strings change underlying font on UITextView/UILabel
Originator: | ahartwell | ||
Number: | rdar://FB7613296 | Date Originated: | March 4, 2020 |
Status: | Open | Resolved: | |
Product: | UIKit | Product Version: | |
Classification: | Reproducible: | Always |
When displaying HTML in a UITextView/UILabel if the document ends in a tag `</b>` or `</i>` the fontDescriptor on the font on the underlying label changes. But if there is a blank character, or a character not wrapped in an html tag, the font is unchanged. Playground that recreates the issue ``` import UIKit var htmlChangesFont = "<i>Testing Test</i>" var htmlDoesntChangeFont = "<i>Testing Test</i> " let textView = UITextView() textView.font = UIFont.systemFont(ofSize: 12) print(textView.font!.fontDescriptor) /* Prints out: UICTFontDescriptor <0x600001881020> = { NSCTFontUIUsageAttribute = CTFontRegularUsage; NSFontSizeAttribute = 12; } */ let data = html.data(using: .utf8)! let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [ .documentType: NSAttributedString.DocumentType.html, .characterEncoding: NSNumber(value: String.Encoding.utf8.rawValue), ] let attributedString = try? NSMutableAttributedString(data: data, options: options, documentAttributes: nil) let paragraphStyle = NSMutableParagraphStyle() paragraphStyle.alignment = .center let range = NSRange(location: 0, length: attributedString?.length ?? 0) attributedString?.addAttribute(.paragraphStyle, value: paragraphStyle, range: range) textView.attributedText = attributedString print(textView.font!.fontDescriptor) /* Prints out: UICTFontDescriptor <0x6000018950e0> = { NSFontNameAttribute = "TimesNewRomanPS-ItalicMT"; NSFontSizeAttribute = 12; } */ ```
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