iOS-切换当前的控制器（popThenPush）

微信: 导航控制器控制的界面A通过按钮点击跳转到扫码界面B, 扫到二维码跳到界面C, 界面C popViewController会跳转到界面A

   func popThenPush(){
    
    //需要推出的控制器
    let viewController = UIViewController()
    viewController.view.backgroundColor = UIColor.redColor()
    //根据需要隐藏tabBar
    viewController.hidesBottomBarWhenPushed = true
    
    var viewControllers = self.navigationController?.viewControllers
    viewControllers?.removeLast()
    viewControllers?.append(viewController)
    
    self.navigationController?.setViewControllers(viewControllers!, animated: true)
}

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