Cocoa 视图不'；t使用TranslatesAutoResizengMaskintoConstraints加载=false

这是我在NSViewController中加载子视图并添加约束的代码。视图未加载，因为行“view.translatesAutoresizingMaskIntoConstraints=false”我找不到原因

let weddingDataVC = logic.storyboardMain.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier(rawValue: "WeddingDataVC")) as! WeddingDataVC
let myView = weddingDataVC.view
self.addChildViewController(weddingDataVC)

self.view.addSubview(myView)

myView.translatesAutoresizingMaskIntoConstraints = false
let xConstraint = NSLayoutConstraint(item: myView, attribute: .centerX, relatedBy: .equal, toItem: self.view, attribute: .centerX, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([xConstraint])

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您已丢失垂直轴的布局约束

let yConstraint = NSLayoutConstraint(item: myView, attribute: .centerY, relatedBy: .equal, toItem: self.view, attribute: .centerY, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([yConstraint])

没有足够的约束来完全定义大小和原点，然后抛出异常

添加子视图时，它将自动添加缺少的约束。如果您不需要它，您应该自己添加所有约束