UITabBarController

9.png

//对象
let tarCtrl = UITabBarController()
//标签颜色
tarCtrl.tabBar.barTintColor = UIColor.blackColor() 
//字体
tarCtrl.tabBar.tintColor = UIColor.redColor()
//标签控制器里面装的成员 它是以数组的形式

//把导航控制器加在标签控制器里面
let first = firstViewController()
 let navCtrl = UINavigationController(rootViewController: first)
navCtrl.tabBarItem.image = UIImage(named: "78")?.imageWithRenderingMode(.AlwaysOriginal)

 let second = secondViewController()
 second.tabBarItem.title = "second"
 second.tabBarItem.badgeValue = "10"

let third = thirdViewController()
third.tabBarItem.title = "third"
tarCtrl.viewControllers = [navCtrl,second,third]
self.window?.rootViewController = tarCtrl

协议UITabBarControllerDelegate

tarCtrl.delegate = self //代理

代理实现

//第二个参数为将要选中的页面
//只能阻止通过点击标签栏跳转，不能阻止通过代码改变selectedIndex跳转
    func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
        let index = tabBarController.viewControllers?.indexOf(viewController)
      //当选择第二个时，就弹出一个新的界面
        if index == 1{
            let four = fourViewController()
            tabBarController.presentViewController(four, animated: true, completion: nil)
            return false //隐藏第二页 直接显示four
        }
     return true
    }

当触发第一个界面，就直接跳转到第二个界面

override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
 self.tabBarController?.selectedIndex = 1
}