swift笔记--页面跳转的几种方法

//页面跳转的几种方法

import UIKit

//定义一个全局变量,用来记录当前显示器的编号

var pageNum = 0

class SecondSubViewController: UIViewController {

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view.

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// 每次当前视图控制器创建一次，全局变量加一

pageNum = pageNum + 1

// 根据当前的全局变量名设置标题

self.title = "Page\(pageNum)"

self.view.backgroundColor = UIColor.purple

// 添加一个页面跳转按钮

let push = UIButton(frame: CGRect(x: 40, y: 120, width: 240, height: 40))

push.setTitle("Push page", for: UIControlState())

push.backgroundColor = UIColor.orange

push.addTarget(self, action: #selector(SecondSubViewController.pushPage), for: UIControlEvents.touchUpInside)

self.view.addSubview(push)

// 添加一个按钮，点击时返回上一个页面

let pop = UIButton(frame: CGRect(x: 40, y: 180, width: 240, height: 40))

pop.setTitle("Pop Page", for: UIControlState())

pop.backgroundColor = UIColor.orange

pop.addTarget(self, action: #selector(SecondSubViewController.popPage), for: UIControlEvents.touchUpInside)

self.view.addSubview(pop)

// 添加一个按钮，点击时跳转到指定序号的页面

let index = UIButton(frame: CGRect(x: 40, y: 280, width: 240, height: 40))

index.setTitle("Goto Index Page", for: UIControlState())

index.backgroundColor = UIColor.orange

index.addTarget(self, action: #selector(SecondSubViewController.gotoIndexPage), for: UIControlEvents.touchUpInside)

self.view.addSubview(index)

// 添加一个按钮，点击时跳转到根视图

let root = UIButton(frame: CGRect(x: 40, y: 340, width: 240, height: 40))

root.setTitle("Goto root Page", for: UIControlState())

root.backgroundColor = UIColor.orange

root.addTarget(self, action: #selector(SecondSubViewController.gotoRootPage), for: UIControlEvents.touchUpInside)

self.view.addSubview(root)

}

// 创建第一个按钮绑定的方法打开页面（入栈）

@objc func pushPage(){

// 实例化第二个视图控制器

let viewController = SecondSubViewController()

// 把视图压入导航视图

self.navigationController?.pushViewController(viewController, animated: true)

}

// 第二个按钮的方法，将导航视图控制器从堆栈中移除

@objc func popPage(){

self.navigationController?.popViewController(animated: true)

}

// 第三个按钮绑定的方法，根据全局序号，查找堆栈中指定序号的视图控制器

@objc func gotoIndexPage(){

let viewController = self.navigationController?.viewControllers[2]

self.navigationController?.popToViewController(viewController!, animated: true)

}

// 创建第四个按钮绑定的方法,所有子视图出栈

@objc func gotoRootPage(){

self.navigationController?.popToRootViewController(animated: true)

}