使用CAShapeLayer绘制镂空的图层

结合上面两篇，做一个镂空的图层--》可用于app内的新手指引-----直接上代码：

在markView.m里面的代码如下：

UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0,0,self.bounds.size.width, self.bounds.size.height)cornerRadius:0];

UIBezierPath *circlePath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(rect.origin.x,rect.origin.y,rect.size.width,rect.size.height)cornerRadius:radius];

[path appendPath:circlePath];

[path setUsesEvenOddFillRule:YES];

fillLayer = [CAShapeLayer layer];

fillLayer.path = path.CGPath;

fillLayer.fillRule =kCAFillRuleEvenOdd;

fillLayer.fillColor = [UIColor blackColor].CGColor;

fillLayer.opacity =0.8;

[self.layer addSublayer:fillLayer];

效果图：