如何在Swift中让固定区域容纳更大的区域？

// 创建容器视图
let containerView = UIView()
containerView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(containerView)

// 添加容器视图的约束
NSLayoutConstraint.activate([
    containerView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
    containerView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
    containerView.widthAnchor.constraint(equalToConstant: 200),
    containerView.heightAnchor.constraint(equalToConstant: 200)
])

// 添加需要扩展的内容
let contentLabel = UILabel()
contentLabel.translatesAutoresizingMaskIntoConstraints = false
contentLabel.text = "Hello, World!"
containerView.addSubview(contentLabel)

// 添加内容的约束
NSLayoutConstraint.activate([
    contentLabel.centerXAnchor.constraint(equalTo: containerView.centerXAnchor),
    contentLabel.centerYAnchor.constraint(equalTo: containerView.centerYAnchor)
])

// 修改容器视图的约束
containerView.widthAnchor.constraint(equalToConstant: 300).isActive = true
containerView.heightAnchor.constraint(equalToConstant: 300).isActive = true

// 更新布局
self.view.layoutIfNeeded()