使用drawRect中的Core Graphics绘制图像网格:

import UIKit

class GridView: UIView {
    var lineColor: UIColor = .black
    var lineWidth: CGFloat = 1.0
    var gridSize: CGFloat = 10.0

    override func draw(_ rect: CGRect) {
        super.draw(rect)

        guard let context = UIGraphicsGetCurrentContext() else { return }

        context.setStrokeColor(lineColor.cgColor)
        context.setLineWidth(lineWidth)

        var x: CGFloat = 0
        while x< bounds.width {
            context.move(to: CGPoint(x: x, y: 0))
            context.addLine(to: CGPoint(x: x, y: bounds.height))
            x += gridSize
        }

        var y: CGFloat = 0
        while y< bounds.height {
            context.move(to: CGPoint(x: 0, y: y))
            context.addLine(to: CGPoint(x: bounds.width, y: y))
            y += gridSize
        }

        context.strokePath()
    }
}