底部加圆角

bottom_corner

UIBezierPath * bezierPath = [UIBezierPath bezierPathWithRoundedRect:topicView.bounds
                                                          byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight
                                                                cornerRadii:CGSizeMake(5, 5)];
        
        CAShapeLayer *maskLayer = [CAShapeLayer layer];
        maskLayer.frame = topicView.bounds;
        maskLayer.path = bezierPath.CGPath;
        topicView.layer.mask = maskLayer;
    
        UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, ScreenWidth - 10, 44)
                                             byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight)
                                                   cornerRadii:CGSizeMake(10.0, 10.0)];
        
        CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
        maskLayer.frame = CGRectMake(0, 0, ScreenWidth - 10, 44);
        maskLayer.path = maskPath.CGPath;
        bottomView.layer.mask = maskLayer;