UISwipeGestureRecognizer blocked by UITapGestureRecognizer

3
votes

I have a view which needs to handle pan, tap, and swipe gestures. I have pan and tap working, but when I add swipe, it doesn't work. Curiously, it seems that tap somehow blocks the swipes because if I remove the tap, then swipe works fine. Here's how I create my gesture recognizers.

- (void) initGestureHandlers
{
    UISwipeGestureRecognizer *swipeLeftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeLeftGesture:)];
    swipeLeftGesture.numberOfTouchesRequired = 1;
    swipeLeftGesture.direction = UISwipeGestureRecognizerDirectionLeft;
    [self addGestureRecognizer:swipeLeftGesture];

    UISwipeGestureRecognizer *swipeRightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeRightGesture:)];
    swipeRightGesture.numberOfTouchesRequired = 1;
    swipeRightGesture.direction = UISwipeGestureRecognizerDirectionRight;
    [self addGestureRecognizer:swipeRightGesture];

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
    [tapGesture setNumberOfTapsRequired:1];
    [self addGestureRecognizer:tapGesture];

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
    [self addGestureRecognizer:panGesture];
}

A lot of blog suggest using requireGestureRecognizerToFail to handle the case where tap fires before the double tap fires, so I tried that, but it also didn't work.

    [tapGesture requireGestureRecognizerToFail:swipeLeftGesture];
    [tapGesture requireGestureRecognizerToFail:swipeRightGesture];

How can I get tap and swipe in the same view?

2
iosuigesturerecognizer
How do you want them to interact? They should all be able to work all the time or there should be some dependencies? – Wain
remove numberOfTouchesRequired & setNumberOfTapsRequired it not nessary for singel tap gesture and swipe gesture – NANNAV
I want the tap handler to fire when I tap, I want the swipe handler to fire when I swipe. Right now the swipe handler doesn't fire. – Paul Cezanne

2 Answers

7
votes

comment or remove the lines 

 //[tapGesture requireGestureRecognizerToFail:swipeLeftGesture];
 //[tapGesture requireGestureRecognizerToFail:swipeRightGesture];

Also set the all the guesture objects delegate to self. like this

- (void) initGestureHandlers
{
    UISwipeGestureRecognizer *swipeLeftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeLeftGesture:)];
    swipeLeftGesture.numberOfTouchesRequired = 1;
    swipeLeftGesture.direction = UISwipeGestureRecognizerDirectionLeft;
    swipeLeftGesture.delegate = self;
    [self addGestureRecognizer:swipeLeftGesture];

    UISwipeGestureRecognizer *swipeRightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeRightGesture:)];
    swipeRightGesture.numberOfTouchesRequired = 1;
swipeRightGesture = self;
    swipeRightGesture.direction = UISwipeGestureRecognizerDirectionRight;
    [self addGestureRecognizer:swipeRightGesture];

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
    [tapGesture setNumberOfTapsRequired:1];
    [self addGestureRecognizer:tapGesture];
tapGesture.delegate = self;

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
    [self addGestureRecognizer:panGesture];
panGesture.delegate = self;
}

Implement the delegate method like this

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}
3
votes

put this one and try it,

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
{
    return YES;
}