Welcome to the spiral world, where you can adjust the density, color, layer of the spiral, draw the spiral that belongs to you, save it to your phone and share it with your friends.

Code:

funcplayAnimation() {

        let times = showingHistoryRecords.map { $0.duration }

        showingHistoryRecords.enumerated().forEach{ (index, item)in

            item.layers.forEach({ (layer)in

                varanimation:CABasicAnimation!

                ifitem.penStyle== .pencil{

                    layer.strokeEnd=0;

                    animation =CABasicAnimation.init(keyPath:"strokeEnd")

                }else{

                    layer.opacity=0;

                    animation =CABasicAnimation.init(keyPath:"opacity")

                }

                animation.duration= item.duration

                animation.fromValue=0;

                animation.toValue=1

                animation.beginTime=CACurrentMediaTime() + times.enumerated().reduce(0.0, { (result, arg1) ->Doublein

                    ifarg1.0>= index {

                        returnresult

                    }else{

                        returnresult + arg1.1

                    }

                });

                animation.isRemovedOnCompletion=false

                animation.fillMode=kCAFillModeForwards

                layer.add(animation, forKey:"animation");

            })

        }

    }