button只切其中几个圆角

//无边框线

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.openGroupBtn.bounds byRoundingCorners:UIRectCornerTopRight | UIRectCornerBottomRight cornerRadii:CGSizeMake(radius,radius)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

maskLayer.frame = self.openGroupBtn.bounds;

maskLayer.path = maskPath.CGPath;

self.openGroupBtn.layer.mask = maskLayer;

//有边框线

UIBezierPath *rectPath=[UIBezierPath bezierPathWithRoundedRect:self.spellNumBtn.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomLeft cornerRadii:CGSizeMake(radius, radius)];

CAShapeLayer *rectLayer=[CAShapeLayer layer];

//线条颜色

rectLayer.strokeColor=[UIColor colorWithHex:goldenYellow].CGColor;

//填充颜色

rectLayer.fillColor=[UIColor colorWithHex:CenColor].CGColor;

//线条宽度

rectLayer.lineWidth=1;

//起始结束点的样式

rectLayer.lineJoin=kCALineJoinRound;

//线条拐角的样式

rectLayer.lineCap=kCALineCapRound;

rectLayer.path=rectPath.CGPath;

[self.spellNumBtn.layer addSublayer:rectLayer];