swift

swift基础篇之页面跳转

常用的跳转方法有四种：present、dissmiss、push、pop.前两中不含导航栏跳转、后两种导航栏

1. present :跳转

let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let secondVC = storyboard.instantiateViewController(withIdentifier: "SecondViewControllerID") as? SecondViewController else { 
  return
}
secondVC.myStr="wrw"
self.present(secondVC, animated: true, completion: nil)

2. dismiss:返回

self.dismiss(animated: true, completion: nil)

3. push跳转（含导航栏）

let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let threeVC = storyboard.instantiateViewController(withIdentifier: "threeViewControllerID") as? threeViewController else { 
  return 
}
self.navigationController?.pushViewController(threeVC, animated: true)

4. pop返回

self.navigationController?.popViewController(animated: true)

【拓展-如何代码中给页面添加导航栏】

1. 给第一个根控制器添加导航栏

let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let secondVC = storyboard.instantiateViewController(withIdentifier: "SecondViewControllerID") as? SecondViewController else { 
  return 
}
let nav=UINavigationController(rootViewController: secondVC)
self.window?.rootViewController=nav

2.该页面没有导航栏，用present跳转，给下一个页面添加导航栏，且下一个页面可以push跳转：如给secondVC控制器添加导航栏。

let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let secondVC = storyboard.instantiateViewController(withIdentifier: "SecondViewControllerID") as? SecondViewController else { 
  return 
}
secondVC.myStr="bbjjj"
let nav=UINavigationController(rootViewController: secondVC)
self.present(nav, animated: true, completion: nil)

【拓展-加载xib】

加载xib view：

let myView = Bundle.main.loadNibNamed("ActivityAlertView", owner: nil, options: nil)?.first as? ActivityAlertView
myView?.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height)
self.view.addSubview(myView ?? ActivityAlertView() )

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