Switch UIViewController 切換頁面

一、新增UIViewController

vc2.swift

• 宣告資料

  var btn = UIButton()
  var red = CGFloat()
  var blue = CGFloat()
  let WIDTH = UIScreen.main.bounds.size.width
  let HEIGHT = UIScreen.main.bounds.size.height
  

• viewDidLoad

  view.backgroundColor = UIColor(red: red,
                               green: 0,
                               blue: blue,
                               alpha: 1)
    btn.frame.size = CGSize(width: 200,
                            height: 60)
    btn.center = CGPoint(x: WIDTH / 2,
                         y: 119)
    btn.setTitle("close",
                 for: .normal)
    btn.backgroundColor = .blue
    btn.showsTouchWhenHighlighted = true
    btn.layer.cornerRadius = 10
  view.addSubview(btn)
  

二、ViewController.swift

• 宣告資料 ```swift var btn1 = UIButton() var btn2 = UIButton()

let WIDTH = UIScreen.main.bounds.size.width let HEIGHT = UIScreen.main.bounds.size.height

* **viewDidLoad**
```swift
view.backgroundColor = .lightGray

    btn1.frame.size = CGSize(width: 200,
                             height: 60)
    btn1.center = CGPoint(x: WIDTH / 2,
                          y: 119)
    btn1.setTitle("push",
                  for: .normal)
    btn1.backgroundColor = .blue
    btn1.showsTouchWhenHighlighted = true
    btn1.layer.cornerRadius = 10
    btn1.addTarget(self,
                   action: #selector(pushpressed),
                   for: .touchDown)
view.addSubview(btn1)

    btn2.frame.size = CGSize(width: 200,
                             height: 60)
    btn2.center = CGPoint(x: WIDTH / 2,
                          y: 204)
    btn2.setTitle("present",
                  for: .normal)
    btn2.backgroundColor = .red
    btn2.showsTouchWhenHighlighted = true
    btn2.layer.cornerRadius = 10
    btn2.addTarget(self,
                   action: #selector(presentpressed),
                   for: .touchDown)
view.addSubview(btn2)

• 透過NavigationController 跳轉動作

  func pushpressed(sender: UIButton) {
    let vc = vc2()
        // 傳值
        vc.red = 0
        vc.blue = 1
        vc.btn.isHidden = true
    navigationController?.pushViewController(vc,
                                             animated: true)
  }
  

• 透過ViewController 跳轉動作

  func presentpressed(sender: UIButton) {
    let vc = vc2()
        // 傳值
        vc.red = 1
        vc.blue = 0
    present(vc,
            animated: true,
            completion: nil)
  }
  

三、vc2.swift

• viewDidLoad

  btn.addTarget(self,
              action: #selector(viewclose),
              for: .touchDown)
  

• 關閉頁面動作

  func viewclose(sender: UIButton) {
    dismiss(animated: true,
    completion: nil)
  }
  

• 返回動作

  用於自訂返回按鈕, 本章節不多加闡述

  // 須透過navigationcontroller 跳轉時才可調用
  func navigationback(sender: UIButton) {
    // 返回前一頁
    _ = navigationController?.popViewController(animated: true)
    // 指定返回某一頁
    let vc = ViewController()
    _ = navigationController?.popToViewController(vc, animated: true)
    // 返回至第一頁
    _ = navigationController?.popToRootViewController(animated: true)
  }
  

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