Created
July 25, 2017 13:43
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Useful iOS extensions
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| extension UIColor { | |
| func toHex() -> String { | |
| var r:CGFloat = 0 | |
| var g:CGFloat = 0 | |
| var b:CGFloat = 0 | |
| var a:CGFloat = 0 | |
| getRed(&r, green: &g, blue: &b, alpha: &a) | |
| let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0 | |
| return String(format:"#%06x", rgb) | |
| } | |
| } |
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| extension UITextView { | |
| func from(html: String) throws -> NSAttributedString { | |
| let htmlString = "<body>" | |
| .appending(html) | |
| .appending("</body><style>body{font-family:'") | |
| .appending(font!.familyName) | |
| .appending("'; font-size:") | |
| .appending(font!.pointSize.description) | |
| .appending("; color:") | |
| .appending(textColor?.toHex() ?? #colorLiteral(red: 0.2901960784, green: 0.2901960784, blue: 0.2901960784, alpha: 1).toHex()) | |
| .appending(";}</style>") | |
| return try NSAttributedString.init(data: (htmlString.data(using: .unicode, allowLossyConversion: false))!, options: [NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType], documentAttributes: nil) | |
| } | |
| func lines() -> Int { | |
| var numberOfLines = 0 | |
| var index = 0 | |
| let numberOfGlyphs = layoutManager.numberOfGlyphs | |
| var lineRange = NSRange() | |
| while index < numberOfGlyphs { | |
| layoutManager.lineFragmentRect(forGlyphAt: index, effectiveRange: &lineRange) | |
| index = NSMaxRange(lineRange) | |
| numberOfLines += 1 | |
| } | |
| return numberOfLines | |
| } | |
| } |
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