iOS只给矩形两个边加圆角

- (void)updataTopCornerRadius {
    CGRect clipRect = CGRectMake(, , self.headPhotoIv.width, self.headPhotoIv.width);
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:clipRect byRoundingCorners:UIRectCornerTopLeft|UIRectCornerTopRight cornerRadii:CGSizeMake(, )];
    CAShapeLayer *maskLayer = [CAShapeLayer layer];
    maskLayer.frame = clipRect;
    maskLayer.path = maskPath.CGPath;
    self.headPhotoIv.layer.mask = maskLayer;

}