沿绘制线放置UILabel

Question

我想使用CAShapeLayer将UILabel沿着绘制的线放置。

喜欢：

目前，我无法理解如何计算X和Y点，以将标签放置在考虑了计算角度的直线中心。

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    let linePath = UIBezierPath()

    linePath.move(to: CGPoint(x: initialPoint.x, y: initialPoint.y))
    linePath.addLine(to: CGPoint(x: finalPoint.x, y: finalPoint.y))

    let lineLayer = CAShapeLayer()

    lineLayer.lineWidth = lineWidth
    lineLayer.strokeColor = UIColor.white.cgColor
    lineLayer.lineCap = .round
    lineLayer.path = linePath.cgPath

    view.layer.insertSublayer(lineLayer, at: 0)

    // X & Y don't place correctly
    let label = UILabel(frame: CGRect(x: (initialPoint.x - finalPoint.x) / 2, y: (initialPoint.y - finalPoint.y) / 2, width: view.frame.width, height: view.frame.height))

    let angle = atan2(finalPoint.x - initialPoint.x, finalPoint.y - initialPoint.y + navigationHeight)

    label.textColor = .white
    label.font = label.font.withSize(24.0)
    label.text = "Text here"

    label.transform = CGAffineTransform(rotationAngle: angle)

    view.addSubview(label)
}