Swift- Detect tap on NSMutableAttributedString - ios

Question

Is there anyway I can detect tap on NSMutableAttributedString. I have a Sunburst chart. On click of every element I want to show a alert and save that value in Core Data. Right now I have posted only some part of code because the original code is too long to read. I know I can't show alert on UIBezierPath because it is being drawn together for a group of elements so I have no choice but to show alert on NSMutableAttributedString only.
override func draw(_ rect: CGRect) {
let context = UIGraphicsGetCurrentContext()!
/// Group 5
do {
context.saveGState()
context.translateBy(x: 337.7, y: 334.39)
context.rotate(by: -1654 * CGFloat.pi/180)
context.translateBy(x: -321.5, y: -318)
/// Group 4
do {
context.saveGState()
/// Group 8
do {
context.saveGState()
context.translateBy(x: 0.35, y: 0.03)
/// Path
let path8 = UIBezierPath()
path8.move(to: CGPoint(x: 0, y: 32.29))
path8.addCurve(to: CGPoint(x: 141.21, y: 0), controlPoint1: CGPoint(x: 42.61, y: 11.61), controlPoint2: CGPoint(x: 90.54, y: 0))
path8.addCurve(to: CGPoint(x: 213.67, y: 8.12), controlPoint1: CGPoint(x: 166.13, y: 0), controlPoint2: CGPoint(x: 190.39, y: 2.81))
path8.addLine(to: CGPoint(x: 196.1, y: 78.67))
path8.addCurve(to: CGPoint(x: 137.83, y: 71.74), controlPoint1: CGPoint(x: 177.42, y: 74.14), controlPoint2: CGPoint(x: 157.9, y: 71.74))
path8.addCurve(to: CGPoint(x: 28.81, y: 97.08), controlPoint1: CGPoint(x: 98.69, y: 71.74), controlPoint2: CGPoint(x: 61.69, y: 80.85))
path8.addLine(to: CGPoint(x: 0, y: 32.29))
path8.close()
context.saveGState()
context.translateBy(x: 179.79, y: 0)
path8.usesEvenOddFillRule = true
UIColor(hue: 0.133, saturation: 0.137, brightness: 1, alpha: 1).setFill()
path8.fill()
path8.lineWidth = 1
UIColor(white: 0.592, alpha: 1).setStroke()
path8.stroke()
context.restoreGState()
/// Path
let path10 = UIBezierPath()
path10.move(to: CGPoint(x: 77.66, y: 347.23))
path10.addLine(to: CGPoint(x: 11.79, y: 310.67))
path10.addCurve(to: CGPoint(x: 44.49, y: 187.63), controlPoint1: CGPoint(x: 32.59, y: 274.44), controlPoint2: CGPoint(x: 44.49, y: 232.43))
path10.addCurve(to: CGPoint(x: 0, y: 46.03), controlPoint1: CGPoint(x: 44.49, y: 134.96), controlPoint2: CGPoint(x: 28.04, y: 86.13))
path10.addLine(to: CGPoint(x: 61.01, y: 0))
path10.addCurve(to: CGPoint(x: 121.96, y: 186.18), controlPoint1: CGPoint(x: 99.35, y: 52.3), controlPoint2: CGPoint(x: 121.96, y: 116.63))
path10.addCurve(to: CGPoint(x: 77.66, y: 347.23), controlPoint1: CGPoint(x: 121.96, y: 244.96), controlPoint2: CGPoint(x: 105.81, y: 300.01))
path10.close()
context.saveGState()
context.translateBy(x: 520.04, y: 131.32)
path10.usesEvenOddFillRule = true
UIColor(hue: 0.582, saturation: 0.882, brightness: 1, alpha: 1).setFill()
path10.fill()
path10.lineWidth = 1
UIColor(white: 0.592, alpha: 1).setStroke()
path10.stroke()
context.restoreGState()
/// Path
let path12 = UIBezierPath()
path12.move(to: CGPoint(x: 202.13, y: 121.2))
path12.addLine(to: CGPoint(x: 141.15, y: 167.21))
path12.addCurve(to: CGPoint(x: 0, y: 70.57), controlPoint1: CGPoint(x: 107.58, y: 119.98), controlPoint2: CGPoint(x: 57.83, y: 85.06))
path12.addLine(to: CGPoint(x: 17.57, y: 0))
path12.addCurve(to: CGPoint(x: 202.13, y: 121.2), controlPoint1: CGPoint(x: 92.8, y: 17.64), controlPoint2: CGPoint(x: 157.78, y: 61.47))
path12.close()
context.saveGState()
context.translateBy(x: 377.77, y: 8.56)
path12.usesEvenOddFillRule = true
UIColor(hue: 0.208, saturation: 0.328, brightness: 0.91, alpha: 1).setFill()
path12.fill()
path12.lineWidth = 1
UIColor(white: 0.592, alpha: 1).setStroke()
path12.stroke()
context.restoreGState()
context.restoreGState()
}
context.restoreGState()
}
/// Geranium
let geranium = NSMutableAttributedString(string: "Geranium")
geranium.addAttribute(.font, value: UIFont(name: "Helvetica-Bold", size: 10)!, range: NSRange(location: 0, length: geranium.length))
context.saveGState()
context.translateBy(x: 130.07, y: 523.08)
context.rotate(by: 490 * CGFloat.pi/180)
context.translateBy(x: -23.5, y: -6)
geranium.draw(at: CGPoint.zero)
context.restoreGState()
/// Lavender
let lavender = NSMutableAttributedString(string: "Lavender")
lavender.addAttribute(.font, value: UIFont(name: "Helvetica-Bold", size: 10)!, range: NSRange(location: 0, length: lavender.length))
context.saveGState()
context.translateBy(x: 81.5, y: 464.82)
context.rotate(by: 872 * CGFloat.pi/180)
context.translateBy(x: -22.5, y: -6)
lavender.draw(at: CGPoint.zero)
context.restoreGState()
}
}
Output:

Answer 1

You aren't able to detect tap on drawn NSAttributedString because tap is a abstraction from UIKit layer but drawing in rect isn't. So you can use hitTest(_:with:) for tap detection and use its coordinates to compare with coordinates of your NSAttributedString.