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//: A UIKit based Playground for presenting user interface |
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import UIKit |
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import PlaygroundSupport |
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extension NSAttributedString { |
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static func make(html: String, size: CGFloat, color: UIColor) -> NSAttributedString? { |
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// TODO: Size is configured programatically which means we can |
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// change it dynamically if needed (aka dynamic type) |
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let style = """ |
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body { |
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color: \(color.hexString!); |
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font-family: -apple-system; |
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font-size: \(size)px; |
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} |
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b { |
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font-weight: 600; |
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color: hotpink; |
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} |
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""" |
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let template = """ |
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<!doctype html> |
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<html> |
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<head> |
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<style> |
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\(style) |
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</style> |
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</head> |
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<body> |
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\(html) |
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</body> |
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</html> |
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""" |
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guard let data = template.data(using: .utf8) else { |
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return nil |
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} |
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guard let attributedString = try? NSAttributedString( |
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data: data, |
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options: [.documentType: NSAttributedString.DocumentType.html], |
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documentAttributes: nil) else { |
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return nil |
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} |
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return attributedString |
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} |
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} |
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extension UIColor { |
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var hexString: String? { |
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if let components = cgColor.components, components.count == 3 { |
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let r = components[0] |
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let g = components[1] |
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let b = components[2] |
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return String(format: "#%02x%02x%02x", (Int)(r * 255), (Int)(g * 255), (Int)(b * 255)) |
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} |
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return "000000" |
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} |
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} |
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class MyViewController : UIViewController { |
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override func loadView() { |
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let view = UIView() |
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view.backgroundColor = .white |
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let html = """ |
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Let's test <b>bold</b>.<br><br>And a link <a href="http://google.com">google</a>. |
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""" |
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let data = Data(html.utf8) |
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let a = NSAttributedString.make(html: html, size: 18, color: .brown) |
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print(a) |
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let label = UITextView() |
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label.frame = CGRect(x: 20, y: 200, width: 200, height: 100) |
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label.attributedText = a |
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label.linkTextAttributes = [ |
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.foregroundColor: UIColor.red, |
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.underlineColor: UIColor.clear |
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] |
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view.addSubview(label) |
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self.view = view |
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} |
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} |
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// Present the view controller in the Live View window |
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PlaygroundPage.current.liveView = MyViewController() |
