How to draw a curve like this in UIBezierPath Swift? - ios

Question

I am trying to develop a screen whose background looks like this:
Here I am trying to develop the gray curved background and it fills the lower part of the screen as well. I'm very new to UIBezierPath and I've tried this:
class CurvedView: UIView {
//MARK:- Data Types
//MARK:- View Setup
override func draw(_ rect: CGRect) {
let fillColor: UIColor = .blue
let path = UIBezierPath()
let y:CGFloat = 0
print(rect.height)
print(rect.width)
path.move(to: CGPoint(x: .zero, y: 100))
path.addLine(to: CGPoint(x: 60, y: 100))
path.addCurve(to: .init(x: 100, y: 0), controlPoint1: .init(x: 125, y: 80), controlPoint2: .init(x: 50, y: 80))
path.close()
fillColor.setFill()
path.fill()
}
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = .init(hex: "#dfe1e3")
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.backgroundColor = .init(hex: "#dfe1e3")
}
}
This code gave me this:
I followed a lot of tutorials but I didn't get the exact understanding. I understood that for this curve I have to move to (0,100) and then add a line and then add a curve and ten extend the line add a curve then straight line lower curve and then straight line and close. But, when I started as you can see the blue line didn't cover the upper part. Can any one please help me?

Answer 1

Here some example that I create, you can change the value to make it more similar to what you want
Here a guide how control point in a curve work
Note: I called this code in viewDidload
let path = UIBezierPath()
let fillColor = UIColor.blue
let y: CGFloat = UIScreen.main.bounds.size.height
let x: CGFloat = UIScreen.main.bounds.size.width
let height: CGFloat = 200
path.move(to: CGPoint(x: 0, y: y)) // bottom left
path.addLine(to: CGPoint(x: 0, y: y - 20)) // top left
path.addCurve(to: CGPoint(x: x, y: y - height), controlPoint1: CGPoint(x: x * 2 / 3, y: y), controlPoint2: CGPoint(x: x * 5 / 6, y: y - height * 6 / 5)) // curve to top right
path.addLine(to: CGPoint(x: x, y: y)) // bottom right
path.close() // close the path from bottom right to bottom left
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.fillColor = fillColor.cgColor
view.layer.addSublayer(shapeLayer)

Answer 2

in reference to #aiwiguna
class CurvedView: UIView {
//MARK:- Data Types
//MARK:- View Setup
override func draw(_ rect: CGRect) {
let path = UIBezierPath()
let fillColor = UIColor.blue
let y: CGFloat = UIScreen.main.bounds.size.height
let x: CGFloat = UIScreen.main.bounds.size.width
let height: CGFloat = 200
path.move(to: CGPoint(x: 0, y: y)) // bottom left
path.addLine(to: CGPoint(x: 0, y: y - 20)) // top left
path.addCurve(to: CGPoint(x: x, y: y - height), controlPoint1: CGPoint(x: x * 2 / 3, y: y), controlPoint2: CGPoint(x: x * 5 / 6, y: y - height * 6 / 5)) // curve to top right
path.addLine(to: CGPoint(x: x, y: y)) // bottom right
path.close() // close the path from bottom right to bottom left
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.fillColor = fillColor.cgColor
path.close()
fillColor.setFill()
path.fill()
}
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = .red
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.backgroundColor = .yellow
}
}