iOS OC 根控制器切换无过度动画加个layer过渡动画

   CATransition  *transtion =[CATransitionanimation];

    transtion.duration = 0.2;

    transtion.startProgress = 0;

    transtion.endProgress = 1;

    transtion.type = @"rippleEffect";;

    transtion.type=kCATransitionPush;

    transtion.subtype=kCATransitionFromRight;

 [self.navigationControllerpopToRootViewControllerAnimated:YES];

 [[UIApplicationsharedApplication].keyWindow.layeraddAnimation:transtionforKey:@"anmotion"];