How to call function from custom UIView class?

Question

I have UIView in my first view controller. I have set that UIView class to Custom Progress View using following code.

class ProgressView: UIView {
    let trackLayer = CAShapeLayer()
    let shapeLayer = CAShapeLayer()

    static let instance = ProgressView()

    override func awakeFromNib() {
        super.awakeFromNib()
        let center = CGPoint.init(x: frame.width / 2, y: frame.height / 2)
        let circularPath = UIBezierPath(arcCenter: center, radius: 30, startAngle: -CGFloat.pi / 2, endAngle: 2 * CGFloat.pi, clockwise: true)

        trackLayer.path = circularPath.cgPath
        trackLayer.strokeColor = #colorLiteral(red: 0.4745098054, green: 0.8392156959, blue: 0.9764705896, alpha: 1)
        trackLayer.lineWidth = 3
        trackLayer.fillColor = #colorLiteral(red: 0.5568627715, green: 0.3529411852, blue: 0.9686274529, alpha: 1)
        trackLayer.lineCap = kCALineCapRound
        self.layer.addSublayer(trackLayer)
        shapeLayer.path = circularPath.cgPath
        shapeLayer.strokeColor = #colorLiteral(red: 0.8078431487, green: 0.02745098062, blue: 0.3333333433, alpha: 1)
        shapeLayer.lineWidth = 3
        shapeLayer.fillColor = #colorLiteral(red: 0.3794638515, green: 0.5145698786, blue: 0.9605538249, alpha: 1)
        shapeLayer.lineCap = kCALineCapRound
        shapeLayer.strokeEnd = 0
        self.layer.addSublayer(shapeLayer)
    }
}

There is also a function inside that custom UIView class which is for starting animation for filling circle with following code

 func startProgress() {
    let basicAnimation = CABasicAnimation(keyPath: "strokeEnd")
    basicAnimation.toValue = 1
    basicAnimation.duration = 60        
    basicAnimation.fillMode = kCAFillModeForwards
    basicAnimation.isRemovedOnCompletion = false
    shapeLayer.add(basicAnimation, forKey: "soBasic")
}

I need to call that startProgress function inside my First View controller. In viewDidLoad I have called ProgressView.instance.startProgress() but it is not firing. How can I call start progress function from another class?

Show the definition of `ProgressView.instance` method and there is a different way of creating an instance of custom `UIView` if your view is associated with `xib`. — TheTiger, Jun 06 '18 at 06:40
First of all, a view singleton is a bad idea, because a UIView instance will only have one superView — PPL, Jun 06 '18 at 06:43
@TheTiger I did not create xib it's a simple uiview in my view controller and I set its class to progress view. — atalayasa, Jun 06 '18 at 06:54
Yes I did. Nice point I can also call it via that function. Thanks dude :) @TheTiger — atalayasa, Jun 06 '18 at 07:00

Mahendra · Accepted Answer · 2018-06-06T07:10:35.007

4

In ProgressView you need to create an initialise or you can use default one.

class ProgressView: UIView {

    //you can set any additional properties in it.

    override init(frame: CGRect) {
        super.init(frame: frame)

    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
 }

How to use

In view controller where you wanna use...

let pgView = ProgressView() //or any other initialise if you have created
.
.
.
pgView.startProgress()

edited Jun 06 '18 at 07:10

answered Jun 06 '18 at 06:43

Mahendra

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Its nice +1 from me, @Atalay Do not create UIView singletons – PPL Jun 06 '18 at 06:44
Thanks for comment but it gives me an error 'super.init' cannot be called outside of an initializer and Keyword 'init' cannot be used as an identifier here how can I fix it? @MahendraGP – atalayasa Jun 06 '18 at 06:58

How to call function from custom UIView class?

1 Answers1