Question

In my iphone app, I’ve got buttons and I should make them respond to a double click.

How should I do that?

Answer 1

You have to use UIGestures

In the initWithFrame (or initWithCoder if you’re using Interface Builder)

   UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];
    doubleTap.numberOfTapsRequired = 2;
    [self addGestureRecognizer:doubleTap];

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
    singleTap.numberOfTapsRequired = 1;
    [self addGestureRecognizer:singleTap];
    [singleTap requireGestureRecognizerToFail:doubleTap];

    [doubleTap release];
    [singleTap release];

Then add the methods

- (void) doubleTap: (UITapGestureRecognizer *) sender
{

     do whatever
}

- (void) singleTap:(UITapGestureRecognizer *)sender
{

}