Detecting Tap & Hold in UITableView cells - how ?

Question

Hi,

How do we detect a Tap & Hold on a UITableView cell (with and without disclosure buttons on the right).. ?

Answer 1

You should probably handle the UIControlTouchDown event and depending on what you mean by "hold", fire a NSTimer that will count an interval since you initiated the touch and invalidate upon firing or releasing the touch (UIControlTouchUpInside and UIControlTouchUpOutside events). When the timer fires, you have your "tap & hold" detected.

Answer 2

Here's the code lifted straight from my app. You should add these methods (and a boolean _cancelTouches member) to a class you derive from UITableViewCell.

-(void) tapNHoldFired {
    self->_cancelTouches = YES;
   // DO WHATEVER YOU LIKE HERE!!!
}
-(void) cancelTapNHold {
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tapNHoldFired) object:nil];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    self->_cancelTouches = NO;
    [super touchesBegan:touches withEvent:event];
    [self performSelector:@selector(tapNHoldFired) withObject:nil afterDelay:.7];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [self cancelTapNHold];
    if (self->_cancelTouches)
        return;
    [super touchesEnded:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [self cancelTapNHold];
    [super touchesMoved:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [self cancelTapNHold];
    [super touchesCancelled:touches withEvent:event];
}