I'm trying to add animation to the border of UITextField when edited by the user. The idea is to show line animation in the login page once the first text field is being edited and then after the user switches to the next textfield, the line should make a movement to the below text field. I have made an attempt which is not working as what I'm expecting. The following is the code I'm using:
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var verticSpace: NSLayoutConstraint!
@IBOutlet weak var usernameTxtField: UITextField!
@IBOutlet weak var passwordTxtField: UITextField!
weak var shapeLayer: CAShapeLayer?
let path = UIBezierPath()
let shapeLayerNew = CAShapeLayer()
override func viewDidLoad() {
super.viewDidLoad()
usernameTxtField.delegate = self
passwordTxtField.delegate = self
}
func textFieldDidBeginEditing(_ textField: UITextField) {
let path = UIBezierPath()
if textField == usernameTxtField {
if textField.text == "" {
self.startMyLine()
}
}
if passwordTxtField.isFirstResponder {
let path2 = UIBezierPath()
path2.move(to: CGPoint(x: usernameTxtField.frame.width, y: usernameTxtField.frame.height - shapeLayerNew.lineWidth))
path2.addLine(to: CGPoint(x: usernameTxtField.frame.width, y: (usernameTxtField.frame.height - shapeLayerNew.lineWidth) + passwordTxtField.frame.height + verticSpace.constant))
path2.addLine(to: CGPoint(x: 0, y: (usernameTxtField.frame.height - shapeLayerNew.lineWidth) + passwordTxtField.frame.height + verticSpace.constant))
let combinedPath = path.cgPath.mutableCopy()
combinedPath?.addPath(path2.cgPath)
shapeLayerNew.path = path2.cgPath
let startAnimation = CABasicAnimation(keyPath: "strokeStart")
startAnimation.fromValue = 0
startAnimation.toValue = 0.8
let endAnimation = CABasicAnimation(keyPath: "strokeEnd")
endAnimation.fromValue = 0.2
endAnimation.toValue = 1.0
let animation = CAAnimationGroup()
animation.animations = [startAnimation, endAnimation]
animation.duration = 2
shapeLayerNew.add(animation, forKey: "MyAnimation")
}
}
func startMyLine() {
self.shapeLayer?.removeFromSuperlayer()
// create whatever path you want
shapeLayerNew.fillColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0).cgColor
shapeLayerNew.strokeColor = #colorLiteral(red: 1, green: 0, blue: 0, alpha: 1).cgColor
shapeLayerNew.lineWidth = 4
path.move(to: CGPoint(x: 0, y: usernameTxtField.frame.height - shapeLayerNew.lineWidth))
path.addLine(to: CGPoint(x: usernameTxtField.frame.width, y: usernameTxtField.frame.height - shapeLayerNew.lineWidth))
// create shape layer for that path
shapeLayerNew.path = path.cgPath
// animate it
usernameTxtField.layer.addSublayer(shapeLayerNew)
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.fromValue = 0
animation.duration = 2
shapeLayerNew.add(animation, forKey: "MyAnimation")
// save shape layer
self.shapeLayer = shapeLayerNew
}
}
And this is the result I'm getting:
And this is what I need to see:
