Rilevamento Tap & amp; Conserva nelle celle UITableView

Question

Come rileviamo un tap & amp; tenere premuto un UITableViewCell ?

Answer 1

In iOS 3.2 o versioni successive puoi utilizzare UILongPressGestureRecognizer

Answer 2

Ecco il codice estratto direttamente dalla mia app. È necessario aggiungere questi metodi (e un membro booleano _cancelTouches) a una classe derivata da 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];
}

Answer 3

//Add  gesture to a method where the view is being created. In this example long tap is added to tile (a subclass of UIView):

    // Add long tap for the main tiles
    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longTap:)];
    [tile addGestureRecognizer:longPressGesture];
    [longPressGesture release];

-(void) longTap:(UILongPressGestureRecognizer *)gestureRecognizer{
    NSLog(@"gestureRecognizer= %@",gestureRecognizer);
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {
        NSLog(@"longTap began");

    }

}

Answer 4

Probabilmente dovresti gestire l'evento UIControlTouchDown e, a seconda di cosa intendi con "tieni premuto", attiva un NSTimer che conteggerà un intervallo da quando hai iniziato il tocco e invalidi dopo l'attivazione o il rilascio del tocco (eventi UIControlTouchUpInside e UIControlTouchUpOutside ). Quando il timer scatta, hai il " tocca & amp; contenere " rilevato.