ios - 在不同的类swift中以编程方式创建一个按钮

Question

我是 swift 新手，并尝试以编程方式创建 UIButton。我有两个类。我正在一个类中创建一个按钮并从另一个类中调用该方法。

类 View Controller

import UIKit

class ViewController: UIViewController {
  override func viewDidLoad() {
    super.viewDidLoad()

    let renderobj = render()
    renderobj.sign()
}
  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }
}

类渲染

import UIKit

class render: UIViewController {
  func sign() {
    let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
    button.backgroundColor = .green
    button.setTitle("Test Button", for: .normal)
    button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)

    self.view.addSubview(button)
  }

  func buttonAction(sender: UIButton!) {
    print("Button tapped")
  }
}

但是没有创建按钮。如果我把 UIButton内码 viewDidLoad() ， 有用。我希望在不同类的函数中创建按钮。有可能这样做吗？

谢谢你的帮助

Answer 1

func sign() -> UIButton
{
   let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
   button.backgroundColor = .green
   button.setTitle("Test Button", for: .normal)
   button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
   return button 
}

After returning that button you can add it in your calling view controller view

override func viewDidLoad() {
super.viewDidLoad()

let renderobj = render()
let button = renderobj.sign()
self.view.addSubview(button)
}