//设置按钮的左下角、右下角圆角效果
UIBezierPath *maskPath=[UIBezierPathbezierPathWithRoundedRect:CGRectMake(0,0,WIDTH,37)byRoundingCorners:UIRectCornerBottomLeft |UIRectCornerBottomRightcornerRadii:CGSizeMake(10,10)];
CAShapeLayer *maskLayer=[[CAShapeLayeralloc]init];
maskLayer.frame=CGRectMake(0,0,WIDTH,37);
maskLayer.path=maskPath.CGPath;
self.detailBtn.layer.mask=maskLayer;
注:UIRectCornerBottomLeft-->指定左下角;
UIRectCornerBottomRight-->指定右下角;