關(guān)鍵字段
mask
kCAFillRuleEvenOdd
一、mask
UIBezierPath * bezierPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:0];//先繪制一個(gè)等view大小的區(qū)域
[bezierPath appendPath:[UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0) radius:CGRectGetHeight(self.frame)/2.0 startAngle:0 endAngle:2 * M_PI clockwise:NO]];//在上面區(qū)域內(nèi)再繪制一個(gè)圓形
CAShapeLayer * shapelayer = [CAShapeLayer layer];
shapelayer.path = bezierPath.CGPath;
shapelayer.fillColor = [UIColor blackColor].CGColor;//只要不設(shè)置為透明色都可以
self.layer.mask = shapelayer;
效果：
image.png
參考：https://blog.csdn.net/weixin_39339407/article/details/81076638
