UIView*view2=[[UIView alloc]initWithFrame:CGRectMake(120,10,80,80)];view2.backgroundColor=[UIColor redColor];[self.view addSubview:view2];
//设置左下角和右下角为圆角
UIBezierPath *maskPath=[UIBezierPath bezierPathWithRoundedRect:view2.bounds byRoundingCorners:UIRectCornerBottomLeft|UIRectCornerBottomRight cornerRadii:CGSizeMake(10,10)];
CAShapeLayer* maskLayer=[[CAShapeLayer alloc]init];maskLayer.frame=view2.bounds;maskLayer.path=maskPath.CGPath;view2.layer.mask=maskLayer;
