Question

I want to implement a long press on my button and after that long press a cross button should appear on the top of the button to remove that button from scroll view which is added in table view.

I search on web and got UILongPressGestureRecognizer to implement.I tried with it but I have many button in my scroll view and I put UILongPressGestureRecognizer on every button but how will I give reference of the pressed button to the selector method so that I can add a cross button on that particular pressed button.

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(deleteAppFromList:)];
UIButton *btn=(UIButton *)[cell.contentView viewWithTag:101+i];
[btn addGestureRecognizer:longPressGesture];
[longPressGesture release];

Please suggest me how to implement this.I want to do the functionality just as when we delete an app from ios device or simulator.

Answer 1

I’ve just done something similar. I detect the touchDown event, schedule a timed method which sets a flag after 1 second, then when the touch up event is detected it checks the flag and calls the appropriate method.

[myButton addTarget:self action:@selector(itemTouchDown) forControlEvents:UIControlEventTouchDown];
[myButton addTarget:self action:@selector(itemTouchUpInside) forControlEvents:UIControlEventTouchUpInside];

-(void)itemHoldTimer:(NSTimer *)timer
{
    self.itemHoldTimer = nil;
    didHold = YES;
}

-(void)itemTouchDown{
    didHold = NO;
    self.itemHoldTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(itemHoldTimer:) userInfo:nil repeats:NO]; 
}

-(void)itemTouchUpInside {
    if (didHold) {
        didHold = NO;
        [self itemWasTouchedUpAndDidHold];
    } else {
        didHold = NO;
        [self itemWasTouchedUp];
    }
}