ios - 如何以编程方式制作此自动布局？

Question

如何为所有设备制作标签自动布局。

        golabel = UILabel(frame: CGRectMake(30, 100, 350, 100))
        golabel.text = "Game Over"
        golabel.textColor = UIColor.whiteColor()
        golabel.font = UIFont(name: "AppleSDGothicNeo-Thin" , size: 70)
        self.view.addSubview(golabel)

Answer 1

let golabel = UILabel()

golabel.setTranslatesAutoresizingMaskIntoConstraints(false)

let horizontalConstraint = NSLayoutConstraint(item: golabel, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: 30)
view.addConstraint(horizontalConstraint)

let verticalConstraint = NSLayoutConstraint(item: golabel, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 100)
view.addConstraint(verticalConstraint)

let widthConstraint = NSLayoutConstraint(item: golabel, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 350)
golabel.addConstraint(widthConstraint)

let heightConstraint = NSLayoutConstraint(item: golabel, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100)
golabel.addConstraint(heightConstraint)