给label设置外边线

我的需求是这样的给宽度自适应label设置圆角，加外边线 且前各留一点距离

//给label赋值
self.status_descLabel.text = model.GroupModel.category_name;
//label字体居中显示
    self.status_descLabel.textAlignment = NSTextAlignmentCenter;
//计算label的宽度 然后在加上一点距离 ，并且赋值给label的约束
    self.widthLayoutConstraint.constant = [model.GroupModel.category_name boundingRectWithSize:CGSizeMake(260, 14) options:NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size.width+15;
    //约束立即生效
    [self.status_descLabel layoutIfNeeded];
//给label设置圆角 边线 颜色
    self.status_descLabel.layer.cornerRadius = 10;
    self.status_descLabel.layer.borderWidth = 1;
    self.status_descLabel.layer.borderColor = [UIColor greenColor].CGColor;

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