如何在 swift 中制作形状

Question

How to make a shape like this

func createShape() {
        bezierPath = UIBezierPath()
        bezierPath.move(to: .zero)
        bezierPath.addLine(to: CGPoint(x:self.frame.width , y: self.frame.origin.y))
        bezierPath.addLine(to: CGPoint(x: self.frame.width, y: self.frame.height / 2))
        bezierPath.addCurve(to: CGPoint(x:self.frame.width/2 , y: self.frame.height), controlPoint1: CGPoint(x: self.frame.width, y: self.frame.height / 2), controlPoint2: CGPoint(x:self.frame.width/2  + 33 , y: self.frame.height))
        bezierPath.addCurve(to: CGPoint(x: 0, y: self.frame.height / 2), controlPoint1: CGPoint(x:  self.frame.width/2 - 33, y:self.frame.height), controlPoint2: CGPoint(x: 0, y: self.frame.height / 2))
        bezierPath.addLine(to: .zero)
        bezierPath.close()
    }

and as a result i got

Can you help me?

Answer 1

read how a curve work here

let bezierPath = UIBezierPath()
        bezierPath.move(to: .zero)
        bezierPath.addLine(to: CGPoint(x: 0 , y: self.frame.height/2))
        bezierPath.addCurve(to:  CGPoint(x:self.frame.width , y: self.frame.height / 2), controlPoint1: CGPoint(x: 0, y: (self.frame.height+self.frame.width)/2), controlPoint2: CGPoint(x: self.frame.width, y: (self.frame.height+self.frame.width)/2))
        bezierPath.addLine(to: CGPoint(x: self.frame.width, y: 0))
        bezierPath.addLine(to: .zero)

Answer 2

Here is the drawing that you need.. it will give you perfect circle with UIBezierpath addArc method

import UIKit

@IBDesignable class CustomView: UIView {

 private lazy var shapeLayer = CAShapeLayer()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
        
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }
    
    private func commonInit() {
        
        shapeLayer.fillColor = UIColor.black.cgColor
        shapeLayer.strokeColor = UIColor.red.cgColor
        shapeLayer.borderWidth = 5
        shapeLayer.frame = bounds
        
        
        layer.addSublayer(shapeLayer)
        
    }
    
    override func layoutSubviews() {
        
        shapeLayer.path = drawShape()
    }
    
    
    private func drawShape() -> CGPath {
        
        let bezierPath = UIBezierPath()
        
        bezierPath.move(to: .zero)
        bezierPath.addLine(to: CGPoint(x: 0, y: bounds.midY/2))
        bezierPath.addArc(withCenter: CGPoint(x: bounds.midX, y:  bounds.midY), radius: bounds.midX, startAngle: .pi, endAngle: 0, clockwise: false)
        
        bezierPath.addLine(to: CGPoint(x: bounds.maxX, y: 0))
        bezierPath.close()
        
        return bezierPath.cgPath
        
        
    }
    
    
}

with Background color