Swift 标签控制器（tabbar添加提醒和控制器）

// Override point for customization after application launch.

//初始化window， 大小为设备物理大小

self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

//把window的背景颜色改成白色

self.window?.backgroundColor = UIColor.whiteColor()

//让window作为主window显示

self.window?.makeKeyAndVisible()

/*-----------------初始化Tabbar控制器--------------*/

let home = UIViewController()

let message = UIViewController()

let search = UIViewController()

let setting = UIViewController()

let viewControllers = [home, message, search, setting]

let tabbarCtrl = UITabBarController()

tabbarCtrl.viewControllers = viewControllers

self.window?.rootViewController = tabbarCtrl

//创建UITabBarItem

//使用系统的样式创建

let tabItem1 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Favorites, tag: 1)

home.tabBarItem = tabItem1

let tabItem2 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Bookmarks, tag: 1)

message.tabBarItem = tabItem2

//使用自定义的图片、标题

let tabItem3 = UITabBarItem(title: "搜索", image: UIImage(named: "tabbar_discover_highlighted.png"), tag: 1)

search.tabBarItem = tabItem3

let tabItem4 = UITabBarItem(title: "设置", image: UIImage(named: "tabbar_profile_highlighted.png"), tag: 1)

setting.tabBarItem = tabItem4

/*------------------设置tabbar工具栏------------------*/

let tabbar = tabbarCtrl.tabBar

//设置tabBar的背景图片

var img = UIImage(named: "navbg.png")

UIGraphicsBeginImageContext(CGSizeMake(width, 49))

img?.drawInRect(CGRectMake(0, 0, width, 49))

img = UIGraphicsGetImageFromCurrentImageContext()

UIGraphicsEndImageContext()

tabbar.backgroundImage = img

//设置tabBar的选中图片颜色

tabbar.tintColor = UIColor.redColor()

//设置选中item后，盖在此item上的图片

tabbar.selectionIndicatorImage = UIImage(named: "选中.png")

//为item是指一个小图标

tabItem1.badgeValue = "New";