Swipe Gesture between UIView

Question

I have an ViewController class, where i have an UIView called templateView on self.view, which consists of an UIView called gridView, here i need to swipe on templateView, for that i have added swipegesture like,

swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightAction)];
swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftAction)];

swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
swipeRight.delegate = self;

swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
swipeLeft.delegate = self;

 [templateView addGestureRecognizer:swipeRight];
 [templateView addGestureRecognizer:swipeLeft];

In the swipeRight and swipeLeft i need to move the gridView left side and right side.. What i need to implement in these methods..?

Answer 1

You can move the gridView by using some UIViewAnimations. Create something like that:

-(void)swipeRightAction{
    [UIView setAnimationDuration:1];
    gridView.frame = CGRectMake(320,0);
    [UIView commitAnimations];
}

This code will change the frame of your gridView. You need to change this parameter according to where you want to slide your view. I didn't try the code, let me know if it works.

Answer 2

I'd suggest

1. Use a gesture handler that takes a parameter (in case you ever add gestures to multiple views);

2. Make sure the view in question has userInteractionEnabled turned on.

3. You don't need to set the gesture's delegate unless you're implementing one of the UIGestureRecognizerDelegate methods.

Thus, the configuration might look like:

templateView.userInteractionEnabled = YES;

swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[templateView addGestureRecognizer:swipeRight];

swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[templateView addGestureRecognizer:swipeLeft];

And then the gesture handler might look like:

- (void)handleSwipe:(UISwipeGestureRecognizer *)gesture
{
    CGRect frame = self.gridView.frame;

    // I don't know how far you want to move the grid view.
    // This moves it off screen.
    // Adjust this to move it the appropriate amount for your desired UI

    if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
        frame.origin.x += self.view.bounds.size.width;
    else if (gesture.direction == UISwipeGestureRecognizerDirectionLeft)
        frame.origin.x -= self.view.bounds.size.width;
    else
        NSLog(@"Unrecognized swipe direction");

    // Now animate the changing of the frame

    [UIView animateWithDuration:0.5
                     animations:^{
                         self.gridView.frame = frame;
                     }];
}

Note, if you're using auto layout and if the view is defined by constraints rather than translatesAutoresizingMaskIntoConstraints, then this handler code would have to change appropriately. But hopefully this gives you the basic idea.