how do i detect UIButton's TouchUp event under UIView Gesture

Question

i have multiple buttons and i am adding them into the UIView. I have added TouchDown/TouchUp events to all the buttons. Upto this, everything is pretty simple and works perfect

But now my requirement is, i want to swipe on the view and while swiping, i want to detect the same TouchDown/TouchUp events under the swipe. (say on button's touchdown, i will change highlight image of button and on touchup it get back to its normal image)

Is it possible?

How could i achieve it?

Answer 1

Do you specifically need the swipe gesture?

There is this method which detects when your fingers slide across UIView:

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;

Maybe you can create a class that inherits from UIButton and add the touchesMoved method:

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
   // psuedo code
   [self setBackgroundImageForControlState:@"file.png"];
}

Then in the touches Ended method, you can swap a different image in:

// when finger is raised off the button
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
   // psuedo code
   [self setBackgroundImageForControlState:@"file.png"];
}

Answer 2

Maybe you should hadle events like UIControlEventTouchDragEnter and UIControlEventTouchDragExit ? Not sure, but it seems to be a solution.