CODEWITHSUNDEEP
iphoneuitableview
Matt
Matt

Reputation: 4989

Detect Touch and Hold Inside UITableView

I'm trying to detect touch and hold gestures inside a UITableView, while keeping track of which cell was selected. I need to be able to differentiate between normal taps on a cell and touches that last longer than X seconds (probably 1s or so). The main challenge is that I'd like to do this without subclassing UITableViewCell, since doing so slowed down my scrolling significantly. I think there's probably a way to do this using an NSTimer, but I can't seem to get it working correctly. Using touchesBegan: and touchesEnded: with a timer is out, since I don't see any way to keep track of which cell was selected, unless there's some way to do that with those methods? Any help would be greatly appreciated.

Thanks in advance.

Upvotes: 2

Views: 7082

Answers (3)

Sagiftw
Sagiftw

Reputation: 1658

If we are talking about cells, you may want to get the indexPath of the cell that has been pressed.

Add the gesture recognizer to the cell, right after a new instance has been allocated:

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
[cell addGestureRecognizer:longPress];
[longPress release];

Handle the long press event, and get the indexPath:

-(void) handleLongPress: (UIGestureRecognizer *)longPress {
    if (longPress.state==UIGestureRecognizerStateBegan) {
        CGPoint pressPoint = [longPress locationInView:table];
        NSIndexPath *indexPath = [table indexPathForRowAtPoint:pressPoint];
    }
}

Upvotes: 18

Matthew Leffler
Matthew Leffler

Reputation: 1426

Short answer: Subclass and use a UILongPressGestureRecognizer.

Longer answer: I believe the reason you are having scrolling issues with your UITableViewCell subclass is that the reuseIdentifier is not matching and so cells aren't being reused. Make sure the reuseIdentifier that you are using in your cellForRowAtIndexPath: method matches the reuseIdentifier that you are setting in Interface Builder for the custom UITableViewCell nib. I had the same problem when I made my first subclass and just matching the reuseIdentifier made everything better. :)

As far as using a UILongPressGestureRecognizer, take a look at the documentation for UIGestureRecognizers and you should be able to figure it out pretty quickly.

UILongPressGestureRecognizer Documentation

UIGestureRecognizer Documentation

Upvotes: 3

Rengers
Rengers

Reputation: 15218

UILongPressGestureRecognizer is made for exactly this thing. You an create one and add it to the UITableViewCell to handle long pressses.

Upvotes: 7

Related Questions