CATransition *transition = [CATransition animation];
transition.duration = 0.7;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = @"pageCurl";//{kCATransitionMoveIn, kCATransitionPush, kCATransitionReveal, kCATransitionFade};
//更多私有{@"cube",@"suckEffect",@"oglFlip",@"rippleEffect",@"pageCurl",@"pageUnCurl",@"cameraIrisHollowOpen",@"cameraIrisHollowClose"};
transition.subtype = kCATransitionFromBottom;//{kCATransitionFromLeft, kCATransitionFromRight, kCATransitionFromTop, kCATransitionFromBottom};
[[UIApplication sharedApplication].keyWindow.layer addAnimation:transition forKey:nil];
[[[UIApplication sharedApplication] keyWindow] setRootViewController:tabbar];