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metatext/Views/UIKit/LineChartView.swift

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Swift
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2021-01-24 03:12:30 +00:00
// Copyright © 2021 Metabolist. All rights reserved.
import UIKit
final class LineChartView: UIView {
var values = [Int]() {
didSet { setNeedsDisplay() }
}
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .clear
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var intrinsicContentSize: CGSize {
UIView.layoutFittingExpandedSize
}
override func draw(_ rect: CGRect) {
let path = UIBezierPath()
path.lineWidth = Self.lineWidth
path.lineCapStyle = .round
let valueCount = values.count
guard valueCount > 0, let maxValue = values.max() else { return }
let inset = Self.lineWidth / 2
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for (index, value) in values.enumerated() {
let x = CGFloat(index) / CGFloat(valueCount) * rect.width
let y = rect.height - CGFloat(value) / max(CGFloat(maxValue), CGFloat(0).nextUp) * rect.height
let point = CGPoint(
x: min(max(x, inset), rect.width - inset),
y: min(max(y, inset), rect.height - inset))
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if index > 0 {
path.addLine(to: point)
}
path.move(to: point)
}
path.close()
UIColor.link.setStroke()
path.stroke()
}
}
private extension LineChartView {
static let lineWidth: CGFloat = 2
}