Question

So this is very, very weird. I’ve added a Swipe Gesture Recognizer from the starboards into the view for the first tab in my 6-tab tab bar. I set it to the left direction and connected it as an Action to the firstTabViewController.h. And it works perfectly.

Now, if I try to add the “right direction” Swipe Gesture recognizer to this first tab in the same way, the action doesn’t even register.

Also, if I try to do the same thing in another one of the tabs (not the one at index 0), or move the working tab to a different position in the tab bar, the app crashes with a bad access error when I swipe.

firstTabViewController.h

- (IBAction)swipeLeft:(id)sender;   // Works fine
- (IBAction)swipeRight:(id)sender;  // Doesn't even register

firstTabViewController.m

- (IBAction)swipeLeft:(id)sender {
    int nextIndex = CURRENT_INDEX + 1;  // I did modify this accordingly when the tab was moved

    [self.tabBarController setSelectedIndex:nextIndex];
    NSLog(@"Swipe left");

}

- (IBAction)swipeRight:(id)sender {
    NSLog(@"Swiped Right");
}

Answer 1

Just tested this and it works:

UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeft];
swipeLeft.delegate = self;
[swipeLeft release];

UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRight];
swipeRight.delegate = self;
[swipeRight release];

-(void) swipeRight:(UISwipeGestureRecognizer *) recognizer {
    if (recognizer.direction == UISwipeGestureRecognizerDirectionRight)
        NSLog(@"swipe right");
}

-(void) swipeLeft:(UISwipeGestureRecognizer *) recognizer {
    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft)
        NSLog(@"swipe left");

}