IOS Common menu bar UITabBarController

1, create a three-View-Controller FirstViewController, SecondViewController, ThirdViewController

2、在FirstViewController.swift中viewDidLoad添加
self.title = “Item #1”
self.tabBarItem.image = UIImage(named：“Tab1”)
let label = UILabel(frame：CGRect(x：40, y：150,width：240, height：44))
label.text = “第一页”
label.textAlignment = NSTextAlignment.center
label.font = UIFont(name：“Arial”, size：36)
self.view.addSubview(label)

3 AppDelegate.swift的didFinishLaunchingWithOptions方法：
let firstViewController = FirstViewController()
let secondViewController = SecondViewController()
let thirdViewController = ThirdViewController()
let tabViewController = UITabBarController()
tabViewController.viewControllers =[firstViewController, secondViewController,thirdViewController]
self.window?.rootViewController = tabViewController

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Plus the upper right corner to remind: self.tabBarItem.badgeValue = "8"

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Manually change the tab

1 let button = UIButton(frame：CGRect(x：40, y：220,
width：240, height：44))
2 button.setTitle(“进入第二页”, for：UIControlState())
3 button.backgroundColor = UIColor.black
4 button.addTarget(self, action：

selector(FirstViewController.enterPage2),

for：.touchUpInside)
5 self.view.addSubview(button)
1 func enterPage2()
2 {
3 self.tabBarController？.selectedIndex = 1
4 }

You can change the position of the navigation bar:

let screenWidth = UIScreen.main.bounds.width
tabViewController.tabBar.frame = CGRect(x：0, y：0,width：screenWidth, height：44)

Hide the status bar at the top

info.plist中Status bar is initially hidden=YES
View controller-based status bar appearance=NO

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