iOS 擷取當前正在顯示的ViewController

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//擷取當前螢幕顯示的viewcontroller  - (UIViewController *)getCurrentVC  {      UIViewController *result = nil;            UIWindow * window = [[UIApplication sharedApplication] keyWindow];      if (window.windowLevel != UIWindowLevelNormal)      {          NSArray *windows = [[UIApplication sharedApplication] windows];          for(UIWindow * tmpWin in windows)          {              if (tmpWin.windowLevel == UIWindowLevelNormal)              {                  window = tmpWin;                  break;              }          }      }            UIView *frontView = [[window subviews] objectAtIndex:0];      id nextResponder = [frontView nextResponder];            if ([nextResponder isKindOfClass:[UIViewController class]])          result = nextResponder;      else          result = window.rootViewController;            return result;  } 

  

2.擷取當前螢幕中present出來的viewcontroller。- (UIViewController *)getPresentedViewController  {      UIViewController *appRootVC = [UIApplication sharedApplication].keyWindow.rootViewController;      UIViewController *topVC = appRootVC;      if (topVC.presentedViewController) {          topVC = topVC.presentedViewController;      }            return topVC;  } 

 

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func rootViewCon() -> UIViewController {         var topVC = UIApplication.shared.keyWindow?.rootViewController    while topVC?.presentedViewController != nil {        topVC = topVC?.presentedViewController!    }         return topVC!}

iOS 擷取當前正在顯示的ViewController