Swift 自定义tabBar

一、以storyboard的方式自定义tabBar

    let _width = self.view.frame.width
    let _height = self.view.frame.height - 49

    self.homeVc = UIStoryboard.init(name: "Home", bundle: nil).instantiateViewControllerWithIdentifier("home_sid") as? NavigationController
    self.homeVc!.view.frame = CGRectMake(0, 0, _width, _height)
    //注册controller
    self.addChildViewController(self.homeVc!)

    self.discoverVc = UIStoryboard.init(name: "Discover", bundle: nil).instantiateViewControllerWithIdentifier("discover_sid") as? NavigationController
    self.discoverVc!.view.frame = CGRectMake(0, 0, _width, _height)
    self.addChildViewController(self.discoverVc!)

    self.messageVc = UIStoryboard.init(name: "Message", bundle: nil).instantiateViewControllerWithIdentifier("message_sid") as? NavigationController
    self.messageVc!.view.frame = CGRectMake(0, 0, _width, _height)
    self.addChildViewController(self.messageVc!)

    self.profileVc = UIStoryboard.init(name: "Profile", bundle: nil).instantiateViewControllerWithIdentifier("profile_sid") as? NavigationController
    self.profileVc?.view.frame = CGRectMake(0, 0, _width, _height)
    self.addChildViewController(self.profileVc!)

    self.view.addSubview(self.homeVc!.view)