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@kean
Last active Dec 9, 2020
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//: A UIKit based Playground for presenting user interface
import UIKit
import PlaygroundSupport
extension NSAttributedString {
static func make(html: String, size: CGFloat, color: UIColor) -> NSAttributedString? {
// TODO: Size is configured programatically which means we can
// change it dynamically if needed (aka dynamic type)
let style = """
body {
color: \(color.hexString!);
font-family: -apple-system;
font-size: \(size)px;
}
b {
font-weight: 600;
color: hotpink;
}
"""
let template = """
<!doctype html>
<html>
<head>
<style>
\(style)
</style>
</head>
<body>
\(html)
</body>
</html>
"""
guard let data = template.data(using: .utf8) else {
return nil
}
guard let attributedString = try? NSAttributedString(
data: data,
options: [.documentType: NSAttributedString.DocumentType.html],
documentAttributes: nil) else {
return nil
}
return attributedString
}
}
extension UIColor {
var hexString: String? {
if let components = cgColor.components, components.count == 3 {
let r = components[0]
let g = components[1]
let b = components[2]
return String(format: "#%02x%02x%02x", (Int)(r * 255), (Int)(g * 255), (Int)(b * 255))
}
return "000000"
}
}
class MyViewController : UIViewController {
override func loadView() {
let view = UIView()
view.backgroundColor = .white
let html = """
Let's test <b>bold</b>.<br><br>And a link <a href="http://google.com">google</a>.
"""
let data = Data(html.utf8)
let a = NSAttributedString.make(html: html, size: 18, color: .brown)
print(a)
let label = UITextView()
label.frame = CGRect(x: 20, y: 200, width: 200, height: 100)
label.attributedText = a
label.linkTextAttributes = [
.foregroundColor: UIColor.red,
.underlineColor: UIColor.clear
]
view.addSubview(label)
self.view = view
}
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
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