UIButtion 上下圆角与直角，下中划线

UIButton *clickBtn = [[UIButton alloc]initWithFrame:CGRectMake(cell.contentView.frame.size.width-70-15,10 , 70, 25)];
//下边二个角是圆角上边是直角  UIRectCornerTopLeft   UIRectCornerTopRight
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.displayBtn.bounds      byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight    cornerRadii:CGSizeMake(2, 2)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.displayBtn.bounds;
    maskLayer.path = maskPath.CGPath;
    self.displayBtn.layer.mask = maskLayer;

  //中划线
    NSDictionary *attribtDic = @{NSStrikethroughStyleAttributeName: [NSNumber numberWithInteger:NSUnderlineStyleSingle]};
    //下划线
    NSDictionary *attribtDic = @{NSUnderlineStyleAttributeName: [NSNumber numberWithInteger:NSUnderlineStyleSingle]};
    NSString *oldStr = @"忘记密码";

    NSMutableAttributedString *attribtStr = [[NSMutableAttributedString alloc]initWithString:oldStr attributes:attribtDic];