如何在iPhone中设置可视格式语言（VFL）中相同的垂直位置？

Question

如何在iPhone中以可视格式语言（VFL）设置相同的垂直位置？

我需要为我的电子商务应用做上面的布局：

我刚刚获得了TITLE 1，TITLE 2和PLUS BUTTON以及代码的正确位置：

let viewsDictionary1 = ["title1": title1!, "title2": title2!, "plusButton": plusButton!]
contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[title1]-[title2]-[plusButton]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary1))

let viewsDictionary2 = ["title1": title1!]
contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[title1]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary2))

let viewsDictionary3 = ["title2": title2!]
contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[title2]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary3))

let viewsDictionary4 = ["plusButton": plusButton!]
contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[plusButton]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary4))

但是我如何选择PLUS BUTTON，QUANTITY标签，MINUS BUTTON和TOTAL标签的右侧？

感谢您的帮助。