调整可分配数组的大小

Question

我正在尝试分配一个数组并希望调整数组的大小，即，在程序中需要时增大数组大小。

我的示例代码如下所示

import UIKit

class CustomNavigationViewController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
    }

    func setupViews() {
        let layout = UICollectionViewFlowLayout()
        let rootVC = HomeCollectionViewController(collectionViewLayout: layout)
        viewControllers = [rootVC]
        let v = UIView()
        v.backgroundColor = UIColor.blue
        v.layer.opacity = 0.4
        v.translatesAutoresizingMaskIntoConstraints = false

        // add your view to this view of the controller's container
        let vv = (parent?.view)! 

        vv.addSubview(v)

        // constraints for v
        v.leftAnchor.constraint(equalTo: vv.leftAnchor).isActive = true
        v.rightAnchor.constraint(equalTo: vv.rightAnchor).isActive = true
        v.topAnchor.constraint(equalTo: vv.topAnchor).isActive = true
        v.bottomAnchor.constraint(equalTo: vv.bottomAnchor).isActive = true
    }
}

我该怎么做？