iOS Swift获取当前显示的ViewController

class public func getCurrentVc() -> UIViewController{
    let rootVc = UIApplication.shared.keyWindow?.rootViewController
    let currentVc =getCurrentVcFrom(rootVc!)
    return currentVc
   }

class private func getCurrentVcFrom(_ rootVc:UIViewController) -> UIViewController{
 var currentVc:UIViewController
 var rootCtr = rootVc
 if(rootCtr.presentedViewController != nil) {
   rootCtr = rootVc.presentedViewController!
 }
 if rootVc.isKind(of:UITabBarController.classForCoder()) {
   currentVc = getCurrentVcFrom((rootVc as! UITabBarController).selectedViewController!)
 }else if rootVc.isKind(of:UINavigationController.classForCoder()){
   currentVc = getCurrentVcFrom((rootVc as! UINavigationController).visibleViewController!)
 }else{
   currentVc = rootCtr
 }
 return currentVc
}

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