如果没有Storyboard，如何初始化自定义ViewController？

Question

我没有启用故事板。我正在初始化viewcontroller，如下所示：

var customViewController = CustomViewController();

然后这样说customViewController是零：

self.navigationController!.pushViewController(customViewController, animated: true)

Answer 1

我尝试并成功了

import Foundation
class MyCustomViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.redColor()
    }
}

并按

var customViewController = MyCustomViewController()
self.navigationController?.pushViewController(customViewController, animated: true)

在CustomViewController中有什么内容吗？