ios - 在 Swift 中使用多个 View Controller

Question

我正在以编程方式开发一个非常简单的 Swift 应用程序(没有 Storyboard)。我有一个 HomeViewController

import UIKit

class HomeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func createButton(){

        let button = UIButton()
        button.setTitle("Start", forState: .Normal)
        button.setTitleColor(UIColor.blueColor(), forState: .Normal)
        button.frame = CGRectMake(100,200,50,50)
        button.addTarget(self, action: "timerPressed:", forControlEvents: .TouchUpInside)
        self.view.addSubview(button)

    }

}

我有以下内容

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let home = HomeViewController()
        home.createButton()
    }

}

当我调用 home.createButton() 时，我希望显示一个按钮，但目前没有。我知道该方法有效，因为当我将该 createButton() 方法移动到 ViewController 类中时，它会显示该按钮。我是否遗漏了如何从 HomeViewController 中正确调用 createButton 方法的内容。有没有更好的约定来完成我想做的事情？

Answer 1

    class func createButton(controller: UIViewcontroller){

            let button = UIButton()
            button.setTitle("Start", forState: .Normal)
            button.setTitleColor(UIColor.blueColor(), forState: .Normal)
            button.frame = CGRectMake(100,200,50,50)
            button.addTarget(self, action: "timerPressed:", forControlEvents: .TouchUpInside)
            controller.view.addSubview(button)

        }

现在将此方法调用到任何 ViewController

像这样:

HomeViewController.createButton(self).