我是Swift的新手,我没有太多的信息。我想创建动画时钟,并在时间间隔内填充“ CAShapeLayer ”路径,而不是尝试使用“ CABasicAnimation ”在60秒内。形状会在49秒内完成,动画完成会在60秒内完成,因此无法正常工作。比我更改了animation.byValue = 0.1
,但结果是相同的。有人对这个问题有想法吗?
我的代码是:
var startAngle = -CGFloat.pi / 2
var endAngle = CGFloat.pi * 2
var shapeLayer = CAShapeLayer()
override func viewDidLoad() {
super.viewDidLoad()
let center = view.center
let circlePath = UIBezierPath(arcCenter: center, radius: 100, startAngle: startAngle, endAngle: endAngle, clockwise: true)
shapeLayer.path = circlePath.cgPath
shapeLayer.lineWidth = 20
shapeLayer.strokeColor = UIColor.lightGray.cgColor
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineCap = kCALineCapRound
shapeLayer.strokeEnd = 0
animate(layer: shapeLayer) //Animation func
view.layer.addSublayer(shapeLayer)
}
private func animate(layer: CAShapeLayer) {
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.fromValue = 0.0
animation.toValue = 1.0
animation.duration = 60.0 //I think is counting by seconds?
animation.repeatCount = .infinity
animation.fillMode = kCAFillModeForwards
layer.add(animation, forKey: "strokeEndAnimation")
}
答案 0 :(得分:1)
问题出在制作BezierPath上。
尝试以下方法:
let circlePath = UIBezierPath(arcCenter: .zero, radius: 100, startAngle: 0, endAngle: 2 * CGFloat.pi, clockwise: true)
shapeLayer.path = circlePath.cgPath
shapeLayer.lineWidth = 20
shapeLayer.strokeColor = UIColor.lightGray.cgColor
shapeLayer.strokeStart = 0
shapeLayer.strokeEnd = 0
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineCap = kCALineCapRound
shapeLayer.strokeEnd = 0
shapeLayer.position = self.view.center
shapeLayer.transform = CATransform3DRotate(CATransform3DIdentity, -CGFloat.pi / 2, 0, 0, 1)
arcCenter必须位于.zero并将形状的中心设置为视图的中心。不过,您的圈子将从最右边的点开始动画,因此添加CATransform可以将形状逆时针旋转90度。