Ios swift Autolayout 3按钮设置水平宽度根据文本管理

我必须在一个子视图中设置按钮，最大按钮是三个，最小按钮是零 我尝试设置水平按钮，但其宽度始终相等，我尝试设置左对齐，取决于按钮文本宽度，还有一个问题是，如果缺少任何一个按钮，我的意思是，如果按钮数组计数为2和1，则不显示任何一个，请给我解决方案 这是我的密码

 let button1  = UIButton()
                  let button2  = UIButton()
                 let button3  = UIButton()
            print(getChannelname)
            for var i = 0; i < getChannelname.count; i++ {

                if(i == 0)
                {
                    button1.translatesAutoresizingMaskIntoConstraints = false
                    button1.backgroundColor = UIColor.greenColor();
                    button1.tintColor = UIColor.blackColor()
                    button1.titleLabel?.textColor = UIColor.blackColor()
                    button1.setTitle("#\(getChannelname[i])" , forState: UIControlState.Normal)
                    button1.titleLabel!.font = UIFont(name: "Arial", size: 12)

                }else if (i == 1)
                {
                    button2.translatesAutoresizingMaskIntoConstraints = false
                    button2.backgroundColor = UIColor.yellowColor();
                    button2.tintColor = UIColor.blackColor()
                    button2.titleLabel?.textColor = UIColor.blackColor()
                    button2.setTitle("#\(getChannelname[i])" , forState: UIControlState.Normal)
                    button2.titleLabel!.font = UIFont(name: "Arial", size: 12)
                }else
                {

                    button3.translatesAutoresizingMaskIntoConstraints = false
                    button3.backgroundColor = UIColor.greenColor();
                    button3.tintColor = UIColor.blackColor()
                    button3.titleLabel?.textColor = UIColor.blackColor()
                    button3.setTitle("#\(getChannelname[i])" , forState: UIControlState.Normal)
                    button3.titleLabel!.font = UIFont(name: "Arial", size: 12)
                }


            }
            cell.viewChannel!.addSubview(button1)
            cell.viewChannel!.addSubview(button2)
            cell.viewChannel!.addSubview(button3)
            cell.viewChannel!.layer.borderWidth = 2


            let leftConstraint = NSLayoutConstraint(item: button1,
                attribute: .Bottom,
                relatedBy: .Equal,
                toItem: cell.viewChannel!,
                attribute: .Bottom,
                multiplier: 1.0,
                constant: 0.0);
            cell.viewChannel!.addConstraint(leftConstraint);

               cell.viewChannel!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[b1]-0-[b2(==b1)]-0-[b3(==b1)]-0-|", options: NSLayoutFormatOptions.AlignAllBottom, metrics: nil, views: ["b1": button1, "b2": button2, "b3": button3]))

---

请给我解答。

如果我已经很好地理解了这个问题，您可以使用UIStackView并在其中创建三个UIButton来做到这一点

以下是一个链接：

**ONE** 
(
    channelsnamelonggergo,
    General
)
**two**
(
    trndnl,
    jive,
    Banter
)
**Three**
(
    channelsnamelonggergo,
    Trending,
    Local
)
**Four**
(
    scoobydoobyparampaa,
    channelsnamesarebigmerge,
    enternewchannelsjive
)