如何向我的tabBarController添加约束？

// 创建约束对象
let leadingConstraint = NSLayoutConstraint(item: tabBarController.view, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1, constant: 0)
let trailingConstraint = NSLayoutConstraint(item: tabBarController.view, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1, constant: 0)
let topConstraint = NSLayoutConstraint(item: tabBarController.view, attribute: .top, relatedBy: .equal, toItem: view, attribute: .top, multiplier: 1, constant: 0)
let bottomConstraint = NSLayoutConstraint(item: tabBarController.view, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: 0)

// 将约束对象添加到视图层级中
view.addConstraints([leadingConstraint, trailingConstraint, topConstraint, bottomConstraint])

// 启用Auto Layout
tabBarController.view.translatesAutoresizingMaskIntoConstraints = false