UISwipeGestureRecognizer和UIScrollView

Question

I have a vertical scrollview(no horizontal scrolling possible) and my tab bar is hidden by default. However, you can, by swiping up in the bottom area of the screen, pull the tab bar up.(content needs a lot of vertical space) There is my dilemma: I want to be able to detect a swipe up gesture in the bottom area of my scrollview, without the scrollview scrolling down. So I was thinking of putting a transparent view over that bottom area, to only detect that swipe up. But this has the problem that, although that view is transparent, all my touch events are intercepted by that view and are not forwarded to the scrollview.

Is it possible to only forward taps to my scrollview, so I am still able to, for example, press buttons that are currently in the bottom area of my scrollview?

Strange problem I know, but I wasn't able to find a similar problem with a working solution.

My scrollview code:

scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 30, 320, self.view.frame.size.height - 50)];
scrollView.showsVerticalScrollIndicator = YES;
scrollView.tag = 0;
scrollView.backgroundColor = [UIColor clearColor];
scrollView.delegate = self;
scrollView.maximumZoomScale = 1.0;
scrollView.clipsToBounds = NO;
scrollView.minimumZoomScale = 1.0;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
scrollview.contentSize = CGMakeSize(320, xxxx);

My transparent view code:

UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc]
                                      initWithTarget:self
                                      action:@selector(showTabBar)];
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
UIView *swipeLayer = [[swipeLayer alloc] initWithFrame:CGRectMake(30, self.view.frame.size.height - 80, 260, 40)];
[hideButtonSwipeActions addGestureRecognizer:swipeUp];
[hideButtonSwipeActions setBackgroundColor:[UIColor clearColor]];
//[hideButtonSwipeActions setUserInteractionEnabled:NO];

...
[swipeUp release];

Thank you very much for any help :)

Answer 1

也许您是否使用触摸（0,480）的坐标来跟踪视图底部？

Answer 2

Have you tried setting the bottom UIView's userInteractionEnabled property to NO? It should still allow your swipe recognizer to work, however it should stop the view from swallowing normal touches.