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override func viewDidLoad() { | |
super.viewDidLoad() | |
let viewBox = UIView() | |
viewBox.frame = CGRect(x: 0, y: 0, width: 50, height: 50) | |
viewBox.backgroundColor = #colorLiteral(red: 0.7450980544, green: 0.1568627506, blue: 0.07450980693, alpha: 1) | |
self.view.addSubview(viewBox) | |
let path = createPath() | |
self.debugPath(path: path) | |
moveAlongPath(view: viewBox, path: path) | |
} | |
private func moveAlongPath(view:UIView , path:CGPath) { | |
let pathAnimation = CAKeyframeAnimation(keyPath: "position") | |
pathAnimation.path = path | |
pathAnimation.calculationMode = .paced | |
pathAnimation.fillMode = CAMediaTimingFillMode.forwards | |
pathAnimation.duration = 5.0 | |
pathAnimation.isRemovedOnCompletion = false | |
view.layer.add(pathAnimation, forKey: nil) | |
} | |
private func createPath()->CGPath { | |
let bezierPath:UIBezierPath = UIBezierPath() | |
let midXPt:CGFloat = view.frame.size.width/2 | |
let midYPt:CGFloat = view.frame.size.height/2 | |
bezierPath.move(to: CGPoint(x: midXPt, y: midYPt*2)) | |
bezierPath.addQuadCurve(to: CGPoint(x: midXPt , y: 0), controlPoint: CGPoint(x: midXPt + 100, y: midYPt)) | |
return bezierPath.cgPath | |
} | |
private func debugPath(path:CGPath) { | |
let shapeLayer = CAShapeLayer() | |
shapeLayer.path = path | |
shapeLayer.fillColor = nil | |
shapeLayer.strokeColor = UIColor.green.cgColor | |
shapeLayer.lineWidth = 1 | |
self.view.layer.addSublayer(shapeLayer) | |
} | |
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