在Swift中绘制正弦曲线

import UIKit

class SineCurveView: UIView {
    
    override func draw(_ rect: CGRect) {
        // 绘制代码
    }
}

override func draw(_ rect: CGRect) {
    guard let context = UIGraphicsGetCurrentContext() else { return }
    
    let width = rect.width
    let height = rect.height
    
    let startPoint = CGPoint(x: 0, y: height / 2)
    let endPoint = CGPoint(x: width, y: height / 2)
    
    context.move(to: startPoint)
    
    for x in stride(from: 0, to: width, by: 1) {
        let y = sin(Double(x) * 2 * Double.pi / 180) * Double(height) / 4 + Double(height) / 2
        let point = CGPoint(x: x, y: y)
        context.addLine(to: point)
    }
    
    context.addLine(to: endPoint)
    
    context.setStrokeColor(UIColor.red.cgColor)
    context.setLineWidth(2)
    context.strokePath()
}

let sineCurveView = SineCurveView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
view.addSubview(sineCurveView)