iOS view 加圆角

 UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRoundedRect:self.backVOne.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:(CGSize){10.0}];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    // 设置绘制路径

    shapeLayer.path = bezierPath.CGPath;

    // 将shapeLayer设置为cornerView的layer的mask

    self.backVOne.layer.mask = shapeLayer;