Detecting Tap & Hold in UITableView cells

问题

How do we detect a tap & hold on a UITableViewCell?

回答1:

In iOS 3.2 or later you can use UILongPressGestureRecognizer

回答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];
}

回答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");

    }

}

回答4:

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.

来源：https://stackoverflow.com/questions/1633397/detecting-tap-hold-in-uitableview-cells

标签

ios

cocoa-touch

gesture