Use a UILongPressGestureRecognizer and set its minimumPressDuration
to 0. It will act like a touch down during the UIGestureRecognizerStateBegan
state.
For Swift 4+
func setupTap() {
let touchDown = UILongPressGestureRecognizer(target:self, action: #selector(didTouchDown))
touchDown.minimumPressDuration = 0
view.addGestureRecognizer(touchDown)
}
@objc func didTouchDown(gesture: UILongPressGestureRecognizer) {
if gesture.state == .began {
doSomething()
}
}
For Objective-C
-(void)setupLongPress
{
self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(didLongPress:)];
self.longPress.minimumPressDuration = 0;
[self.view addGestureRecognizer:self.longPress];
}
-(void)didLongPress:(UILongPressGestureRecognizer *)gesture
{
if (gesture.state == UIGestureRecognizerStateBegan){
[self doSomething];
}
}