- (void)initSubLayer:(CGRect)frame
{
    CAReplicatorLayer *replicatorLayer = [CAReplicatorLayer layer];
    replicatorLayer.frame = frame;
        //延迟的时间
    replicatorLayer.instanceDelay = 0.6 / 5;
        //重复个数
    replicatorLayer.instanceCount = 5;
        //间隔
    replicatorLayer.instanceTransform = CATransform3DMakeTranslation(10,0,0);
    CAShapeLayer *shape = [CAShapeLayer layer];
    shape.frame = CGRectMake(0, 0, 3,40);
    shape.lineWidth = 3;
    shape.lineCap = kCALineCapRound;
    shape.strokeColor = [UIColor redColor].CGColor;
    
    UIBezierPath* path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(1.5, 0)];
    [path addLineToPoint:CGPointMake(1.5, shape.frame.size.height)];
    shape.path = path.CGPath;
    
    [shape addAnimation:[self extendAnimation] forKey:@"scaleAnimation"];
    
    [replicatorLayer addSublayer:shape];
    
    [self.layer addSublayer:replicatorLayer];
}
- (CABasicAnimation*)extendAnimation
{
    CABasicAnimation *scale = [CABasicAnimation animationWithKeyPath:@"transform"];
    scale.fromValue = [NSValue valueWithCATransform3D:CATransform3DScale(CATransform3DIdentity, 1.0, 1.0, 0.0)];
    scale.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(CATransform3DIdentity, 1, 1.0/5, 0.0)];
    scale.autoreverses = YES;
    scale.repeatCount = HUGE;
    scale.duration = 0.6;
    return scale;
}

       CGFloat radius =ceil(MIN(frame.size.width, frame.size.height)) / 2;
        self.shapeLayer = [CAShapeLayer layer];
        self.shapeLayer.fillColor = [[UIColor blackColor] colorWithAlphaComponent:0.2].CGColor;
            //设置线条的宽度和颜色
        self.shapeLayer.lineWidth = 2.0f;
        self.shapeLayer.strokeColor = [UIColor redColor].CGColor;
            //设置stroke起始点
        self.shapeLayer.strokeStart = 0;
        self.shapeLayer.strokeEnd = 1;
            //创建出圆形贝塞尔曲线
        UIBezierPath* circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(radius, radius) radius:radius startAngle: -M_PI_2 endAngle:  -M_PI_2 + 0.00000001   clockwise:NO];
        
        self.shapeLayer.path = circlePath.CGPath;
        
        [self.layer addSublayer:self.shapeLayer];

- (void)startAnimation {
    
    CABasicAnimation* animation =[CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    animation.duration = 2;
    animation.toValue = @0;
    [self.shapeLayer addAnimation:animation forKey:nil];
    
}