mirror of https://github.com/oxen-io/session-ios
add new placeholder icon
parent
65030b7b46
commit
38c6d05236
@ -0,0 +1,67 @@
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import CryptoSwift
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public class PlaceholderIcon {
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private let seed: Int
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// Colour palette
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private var colours: [UIColor] = [
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0x5ff8b0,
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0x26cdb9,
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0xf3c615,
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0xfcac5a
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].map { UIColor(rgb: $0) }
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init(seed: Int, colours: [UIColor]? = nil) {
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self.seed = seed
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if let colours = colours {
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self.colours = colours
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}
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}
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convenience init(seed: String, colours: [UIColor]? = nil) {
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// Ensure we have a correct hash
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var hash = seed
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if !hash.matches("^[0-9A-Fa-f]+$") || hash.count < 12 { hash = seed.sha512() }
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guard let number = Int(hash.substring(to: 12), radix: 16) else {
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owsFailDebug("[PlaceholderIcon] Failed to generate number from seed string: \(seed)")
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self.init(seed: 0, colours: colours)
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return
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}
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self.init(seed: number, colours: colours)
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}
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public func generateLayer(ofSize diameter: CGFloat, with text: String) -> CALayer {
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let colour = self.colours[seed % self.colours.count].cgColor
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let base = getTextLayer(with: diameter, colour: colour, text: text)
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base.masksToBounds = true
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return base
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}
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private func getTextLayer(with diameter: CGFloat, colour: CGColor? = nil, text: String) -> CALayer {
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let font = UIFont.boldSystemFont(ofSize: diameter/2)
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let height = NSString(string: text).boundingRect(with: CGSize(width: diameter, height: CGFloat(MAXFLOAT)), options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil).height
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let frame = CGRect(x: 0, y: (diameter - height)/2, width: diameter, height: height)
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let layer = CATextLayer()
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layer.frame = frame
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layer.foregroundColor = UIColor.white.cgColor
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layer.contentsScale = UIScreen.main.scale
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let fontName = font.fontName;
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let fontRef = CGFont(fontName as CFString);
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layer.font = fontRef;
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layer.fontSize = font.pointSize;
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layer.alignmentMode = .center
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layer.string = text
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let base = CALayer()
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base.frame = CGRect(x: 0, y: 0, width: diameter, height: diameter)
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base.backgroundColor = colour
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base.addSublayer(layer)
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return base
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}
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}
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