How to use a property in multiple view controllers defined in a single file?

Question

I made a function to make a circular animation. Function takes radius:float as input. I have done this in a ViewController Class and it is working fine for that view controller. But now i want to use this animation on multiple view controllers and don't want to write the same code on every single view controller. So i want to know how can i make this function in a separate file in such a way that i only need to call the function with the radius and it will do the work. Or can you tell me the best practice to do that. Thanks in advance.

//

I dont want to do it in myViewController i just want to create a new class only for circular animation. and also dont want to import that class want to do like this-

import UIKit
class CircularProgressView {
    private let shapeLayer = CAShapeLayer()
    public func createProgressView(radius:CGFloat,forView:UIView) {
        let center = forView.center
        let circularPath = UIBezierPath(arcCenter: center, radius: radius, startAngle: -CGFloat.pi/2, endAngle: 2*CGFloat.pi, clockwise: true)

        let trackLayer = CAShapeLayer()
        trackLayer.path = circularPath.cgPath
        trackLayer.strokeColor = UIColor.lightGray.cgColor
        trackLayer.fillColor = UIColor.clear.cgColor
        trackLayer.lineWidth = 10
        forView.layer.addSublayer(trackLayer)

        shapeLayer.path = circularPath.cgPath
        shapeLayer.strokeColor = UIColor.red.cgColor
        shapeLayer.fillColor = UIColor.clear.cgColor
        shapeLayer.lineWidth = 10
        shapeLayer.lineCap = .round
        shapeLayer.strokeEnd = 0
        forView.layer.addSublayer(shapeLayer)
        forView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap)))
    }
    @objc private func handleTap() {
        print("hello s")
        let basicAnimation = CABasicAnimation(keyPath: "strokeEnd")
        basicAnimation.toValue = 1
        basicAnimation.duration = 2

        basicAnimation.fillMode = .forwards
        basicAnimation.isRemovedOnCompletion = false

        shapeLayer.add(basicAnimation, forKey: "basic")
    }
}

and use this like- import UIKit

class ViewController1: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        CircularProgressView().createProgressView(radius: 50, forView: view)
    }

}

but in this code guesture recogniser is not working.

Answer 1

You can simply create a UIViewController extension and add a method animate(with:) in it with the relevant code,

extension UIViewController {
    func animate(with radius: Float) {
        //add your code here..
    }
}

The method animate(with:) is now available to all UIViewController subclasses. So, you can simply call it like so

class VC: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.animate(with: 10.0)
    }
}

There is no need to create any parent class in this case.