在Swift中animation循环进度视图

我想用下面的代码为我的循环progressView制作一个animation。 我希望animation从0开始到我想要的值。 但我永远无法获得animation的工作。

func Popular(){ let circle = Pop;//Pop is a UIView circle.bounds = CGRect(x: 0,y: 0, width: 100, height: 100); circle.frame = CGRectMake(0,0, 100, 100); circle.layoutIfNeeded() var progressCircle = CAShapeLayer(); let centerPoint = CGPoint (x: circle.bounds.width / 2, y: circle.bounds.width / 2); let circleRadius : CGFloat = circle.bounds.width / 2 * 0.83; let circlePath = UIBezierPath(arcCenter: centerPoint, radius: circleRadius, startAngle: CGFloat(-0.5 * M_PI), endAngle: CGFloat(1.5 * M_PI), clockwise: true ); progressCircle = CAShapeLayer (); progressCircle.path = circlePath.CGPath; progressCircle.strokeColor = UIColor.greenColor().CGColor; progressCircle.fillColor = UIColor.clearColor().CGColor; UIView.animateWithDuration(3.0, delay: 1.0, options: [], animations: { progressCircle.lineWidth = 5.0; progressCircle.strokeStart = 0; progressCircle.strokeEnd = 0.20; circle.layer.addSublayer(progressCircle); circle progressCircle.strokeEnd = 0.2; }, completion: { finished in print("Picutre done") }) } 

Answer 1

使用CABasicAnimation

  let circle = Pop var progressCircle = CAShapeLayer() let circlePath = UIBezierPath(ovalInRect: circle.bounds) progressCircle = CAShapeLayer () progressCircle.path = circlePath.CGPath progressCircle.strokeColor = UIColor.greenColor().CGColor progressCircle.fillColor = UIColor.clearColor().CGColor progressCircle.lineWidth = 5.0 circle.layer.addSublayer(progressCircle) let animation = CABasicAnimation(keyPath: "strokeEnd") animation.fromValue = 0 animation.toValue = 0.2 animation.duration = 3 animation.fillMode = kCAFillModeForwards animation.removedOnCompletion = false progressCircle.addAnimation(animation, forKey: "ani") 

Answer 2

两件事情 –

首先 –不要重新初始化progressCircle 。 你正在调用progressCircle = CAShapeLayer (); 两次。 虽然这不是bug。

第二个 –在开始animation之前添加您的子图层。 移动circle.layer.addSublayer(progressCircle); 在animation块之外。