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March 9, 2017 21:10
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HTML to NSAttributedString
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| import UIKit | |
| public extension String { | |
| static let htmlBase = "<html><head><style type='text/css'> body { color: %COLOR%; } %STYLE% </style></head><body>%BODY%</body></html>" | |
| static let cssBase = " h1 { font-family: 'GTWalsheimLight'; font-size: 34px; } h2 { font-family: 'GTWalsheimBold'; font-size: 24px; } h3 { font-family:'GTWalsheimLight'; font-size: 18px; } h4 { font-family:'GTWalsheimBold'; font-size: 14px; } h5 { font-family:'GTWalsheimBold'; font-size: 12px; } p { font-family: 'SourceSansPro-Regular'; font-size: 16px; } p.strong { font-family: 'SourceSansPro-Semibold'; font-size: 16px; }" | |
| public func HTMLtoAttributedText(_ color:UIColor = UIColor.black, css:String = String.cssBase) -> NSAttributedString? { | |
| // maybe break this out into a string extension, but | |
| // for now... lets just leave it here | |
| func hexString(_ c:UIColor) -> String { | |
| var r:CGFloat = 0 | |
| var g:CGFloat = 0 | |
| var b:CGFloat = 0 | |
| var a:CGFloat = 0 | |
| c.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) | |
| } | |
| let combined = (String.htmlBase as NSString) | |
| .replacingOccurrences(of: "%BODY%", with: self) | |
| .replacingOccurrences(of: "%COLOR%", with: hexString(color) ) | |
| .replacingOccurrences(of: "%STYLE%", with: css) | |
| if let data = combined.data(using: .utf8) { | |
| do { | |
| return try NSAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType], documentAttributes: nil) | |
| } | |
| catch { | |
| print("error creating attributed string") | |
| } | |
| } | |
| return nil | |
| } | |
| } |
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