mac上用代码给控件添加约束和iOS上是一样的。
let blueView = NSView.init()
blueView.wantsLayer = true
blueView.layer?.backgroundColor = NSColor.blue.cgColor
blueView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(blueView)
let topConstraint = NSLayoutConstraint.init(item: blueView, attribute: .top, relatedBy: .equal, toItem: self.view, attribute: .top, multiplier: 1.0, constant: 40)
topConstraint.isActive = true
let leftConstraint = NSLayoutConstraint.init(item: blueView, attribute: .left, relatedBy: .equal, toItem: self.view, attribute: .left, multiplier: 1.0, constant: 20)
leftConstraint.isActive = true
let widthConstraint = NSLayoutConstraint.init(item: blueView, attribute: .width, relatedBy:.equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 200)
widthConstraint.isActive = true
let heightConstraint = NSLayoutConstraint.init(item: blueView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 100)
heightConstraint.isActive = true
也可以这么写
let redView = NSView.init()
redView.wantsLayer = true
redView.layer?.backgroundColor = NSColor.red.cgColor
redView.translatesAutoresizingMaskIntoConstraints = false
let contraints = [
redView.leftAnchor.constraint(equalTo: view.leftAnchor,constant: 20),
redView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20),
redView.topAnchor.constraint(equalTo: view.topAnchor, constant: 20),
redView.bottomAnchor.constraint(equalTo: view.bottomAnchor,constant: -20)
]
NSLayoutConstraint.activate(contraints)
