获取当前的control

//获取当前的control

• (UIViewController *)getCurrentViewController {
  UIViewController *result = nil;
  UIWindow * window = [[UIApplication sharedApplication] keyWindow];
  NSLog(@"window:%@ window.windowLevel:%f",window,window.windowLevel);
  //app默认windowLevel是UIWindowLevelNormal，如果不是，找到它
  if (window.windowLevel != UIWindowLevelNormal) {
  NSLog(@"window:%@ window.windowLevel:%f",window,window.windowLevel);
  NSArray *windows = [[UIApplication sharedApplication] windows];
  for(UIWindow * tmpWin in windows) {
  if (tmpWin.windowLevel == UIWindowLevelNormal) {
  NSLog(@"tmpWin:%@ tmpWin.windowLevel:%f",tmpWin,tmpWin.windowLevel);
  window = tmpWin;
  break;
  }
  }
  }
  id nextResponder = nil;
  UIViewController *appRootVC = window.rootViewController;
  //1、通过present弹出VC，appRootVC.presentedViewController不为nil
  if (appRootVC.presentedViewController) {
  NSLog(@"subviews = %@",[window subviews]);
  nextResponder = appRootVC.presentedViewController;
  }else{
  //2、通过navigationcontroller弹出VC
  NSLog(@"subviews == %@",[window subviews]);
  UIView *frontView = [[window subviews] objectAtIndex:0];
  nextResponder = [frontView nextResponder];
  }
  //1、tabBarController
  if ([nextResponder isKindOfClass:[UITabBarController class]]){

    UITabBarController * tabbar = (UITabBarController *)nextResponder;
    UINavigationController * nav = (UINavigationController *)tabbar.viewControllers[tabbar.selectedIndex];
    //或者 UINavigationController * nav = tabbar.selectedViewController;
    result = nav.childViewControllers.lastObject;
  

  }else if ([nextResponder isKindOfClass:[UINavigationController class]]){
  //2、navigationController

    UIViewController * nav = (UIViewController *)nextResponder;
    result = nav.childViewControllers.lastObject;
  

  }else{//3、viewControler

    result = nextResponder;
  

  }

  return result;
  }