获取当前的控制器，代码如下
func currentViewController() -> UIViewController{
var currentVC： UIViewController? = self.window?.rootViewController
while (current?.presentedViewController != nil) {
currentVC = currentVC.presentedViewController
}
if (currentVC?.isKind(of: UITaberViewController.self))! {
currentVC = (currentVC as! UITaberViewController).selectedViewController
}
if (currentVC?.isKind(of: UINavigationController.self))! {
currentVC = (currentVC as! UINavigationController).visibleViewController
}
return currentVC!
}
回退到根控制器
func backToRoot() {
let currentVC = self.currentVIewController()
var rootVC = (current as UIViewController).presentingViewController
if rootVC != nil {
while( rootVC.presentingVIewCOntroller != nil) {
rootVC = rootVC.presentingViewController
}
if ((rootVC?.responds(to: #selector(UIViewController.dismiss(animated:completion:))) == true){
(root as! UINavigationController).popToRootViewController(animated:false)
}
}else{
currentVC.navigationController?.popToRootViewController(animated:false)
}
}
